How does changing the charge’s value influence the force between the two charges?

As the value of charge 1 __________, the value of the force ___________.


decreases; decreases

increases; decreases

increases; does not change

decreases; does not change

Answer:

it will stop

Explanation:

Answer:

Explanation:

Given,

We need to find the wavelength of sound wave :

We know that ,

where,

on substituting the values we get :

[tex]\dashrightarrow \sf \: 220 = \dfrac{680}{\lambda} \\ \\ \dashrightarrow \sf \: \lambda = \frac{680}{220} \\ \\ \dashrightarrow \sf \:\lambda = 3.0909 \: m\\ [/tex]

Hence,

Answer:

s

Explanation:

The density of the plastic found inside the box would be = 960kg/m³

The volume of the box at the recycling center= 0.125m³

The mass of the full box = 120kg

The formula use to calculate the density of the plastic = mass/volume.

That is ; Density = mass /volume = kg/m³

Density = 120/0.125

= 960kg/m³

The type of plastic that is in the box is LDPE (low density polyethylene). This is because the density calculate fell within the range of 940–960 kg/m3.

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Complete question:

A recycling center has a 0.125 m³ box filled with one type of plastic. The full box has a mass of 120 kilograms. What is the density of the plastic? What type of plastic is in the box? JUSTIFY your answer.

Answer:

17.0 kg

Explanation:

The kinetic energy (KE) of the system can be expressed as:

KE = (1/2)mv^2

where m is the mass of the cart and student combined, and v is the velocity of the cart.

We know that KE = 4896 J and v = 12 m/s. We can rearrange the equation to solve for m:

m = 2KE/v^2

m = 2(4896 J) / (12 m/s)^2

m = 17.0 kg

Therefore, the mass of the student and cart combined is 17.0 kg.

To measure the voltage across R₂ using an oscilloscope, you need to connect the probe across R₂ in parallel.

To measure the voltage across R₂ using an oscilloscope, you need to connect the probe across R₂ in parallel. Here's how you can do it:

Turn off the power to the circuit and make sure that it is completely discharged.

Take the oscilloscope probe and connect the ground clip to the ground reference of the circuit.

Connect the probe tip to the point where you want to measure the voltage, which in this case is across R₂.

Set the oscilloscope to the appropriate voltage range and scale so that you can clearly see the waveform.

Turn on the power to the circuit and observe the waveform on the oscilloscope.

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Answer:

Risk reduction deals with mitigating potential losses by reducing the likelihood and severity of a possible loss. For example, a risk-avoidant investor who is considering investing in oil stocks may decide to avoid taking a stake in the company because of oil's political and credit risk.

Explanation:

For the given question value of mass=20kg. The formula for gravitational attraction between two masses is:

F = G * (m1 * m2) / r^2

where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between the centers of the masses.

Given:

F = 6.7 * 10^-9 N

r = 2 m

G = 6.7 * 10^-11 N m^2 / kg^2 (gravitational constant)

Since the two masses are equal, we can write m1 = m2 = m.

Substituting the given values into the formula and solving for m, we get:

6.7 * 10^-9 N = 6.7 * 10^-11 N m^2 / kg^2 * (m^2 / (2 m)^2) * m^2

Simplifying:

6.7 * 10^-9 N = 6.7 * 10^-11 N * m^2 / 4

Multiplying both sides by 4:

m^2 = (6.7 * 10^-9 N * 4) / 6.7 * 10^-11 N

Simplifying:

m^2 = 4 * 10^2 kg

Taking the square root of both sides:

m = 20 kg

thus, each mass has a value of 20 kg.

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The reason for the deflection of the compass from the magnetic north of the Earth when a current-carrying wire is placed over Magnetic effect due to current carrying wire.

What is Magnetic effect ?

Magnetic effect refers to the influence that a magnet or a magnetic field has on other magnets, magnetic materials, or moving charges. This effect is a result of the physical properties of magnetic fields, which are created by moving charges, such as electrons.

The magnetic effect is responsible for various phenomena, including the attraction or repulsion of magnets, the creation of magnetic fields around current-carrying wires, the behavior of moving charges in a magnetic field, and the generation of electricity in electric generators.

The reason for the deflection of the compass from the magnetic north of the Earth when a current-carrying wire is placed over it is option (a) - Magnetic effect due to current carrying wire.

When a current flows through a wire, it creates a magnetic field around the wire. This magnetic field can interact with the magnetic field of the Earth, causing the compass needle to deflect from its original direction. This phenomenon is known as the magnetic effect of a current-carrying wire.

Therefore, she action of connecting a battery to the wire and placing it over the compass caused a current to flow through the wire, which in turn created a magnetic field around the wire, leading to the deflection of the compass needle.

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With electric force, like charges repel each other. Therefore, option A is the correct answer. This is because like charges, such as two positive or two negative charges, have the same sign and will produce an electric field that points away from each other.

Opposite charges, such as positive and negative, will produce an electric field that points towards each other, resulting in an attractive force that brings the charges closer together.

One can identify a charged body using a charged rod, such as a plastic rod that has been rubbed with a cloth. If you bring the charged rod close to an uncharged object, such as a piece of paper, and the paper is attracted to the rod, the rod is negatively charged. If the rod repels the paper, the rod is positively charged.

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The ship's speed relative to the ground is 25 km/hr to the South.

The displacement is zero, which means that the final position is the same as the initial position. The movements to the North and South cancel out, and the movements to the East and West cancel out.

Velocity is a vector quantity that describes the rate at which an object's position changes over time.In other words, velocity is an object's speed in a specific direction. The velocity of an object is typically represented by a vector, which has both magnitude (the speed of the object) and direction.

The ship's speed relative to the water is 22 km/hr to the South. If there is a current of 3 km/hr to the South, the ship's speed relative to the ground is the vector sum of its speed relative to the water and the velocity of the current. Since the two velocities are in the same direction, we can simply add them to get:

velocity relative to the ground = 22 km/hr to the South + 3 km/hr to the South = 25 km/hr to the South.

Therefore, the ship's speed relative to the ground is 25 km/hr to the South.

Similar to the previous problem, the ship's speed relative to the ground is the vector sum of its speed relative to the water and the velocity of the current. However, this time the current is going in the opposite direction, so we need to subtract the velocity of the current from the ship's speed relative to the water:

velocity relative to the ground = 22 km/hr to the South - 3 km/hr to the North = 22 km/hr to the South + 3 km/hr to the South = 25 km/hr to the South.

Therefore, the ship's speed relative to the ground is 25 km/hr to the South.

The displacement is characterized by the difference between the final and initial positions. In this case, the initial position and the final position are the same, so the displacement is zero. We can represent the two movements using vectors:

50 m to the right = +50 m i

20 m to the left = -20 m i

The displacement vector is the vector sum of these two vectors:

displacement = +50 m i - 20 m i = +30 m i

Since the x-component of the displacement vector is positive, the displacement is to the right.

We can represent the four movements using vectors:

2 km North = +2 km j

4 km East = +4 km i

2 km South = -2 km j

4 km West = -4 km i

The displacement vector is the vector sum of these four vectors:

displacement = +2 km j + 4 km i - 2 km j - 4 km i = 0 km i + 0 km j

Therefore, the displacement is zero, which means that the final position is the same as the initial position. The movements to the North and South cancel out, and the movements to the East and West cancel out.

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The minimum current through R1 will be 10mA.

Using Ohm's Law (V = IR), we can find the minimum current through R1 as follows:

Vr1 = Vz5 + Vz6

where Vr1 is the voltage across resistor R1.

Therefore, the minimum current through R1 is:

Ir1 = Vr1 / R1

Assuming that R1 is a standard value resistor (e.g., 1kΩ), and the Zener voltages are each 5V, the voltage across R1 will be:

Vr1 = Vz5 + Vz6 = 5V + 5V = 10V

Therefore, the minimum current through R1 will be:

Ir1 = Vr1 / R1 = 10V / 1kΩ = 10mA

Current is the flow of electric charge through a conductor or material. It is defined as the rate of flow of electric charge, measured in units of amperes (A). One ampere is equivalent to the flow of one coulomb of electric charge per second.

Electric current is caused by the movement of charged particles, typically electrons, in a circuit. When a voltage is applied to a conductor, it creates an electric field that causes electrons to move through the conductor. This flow of electrons constitutes an electric current.

The direction of electric current is defined as the direction of flow of positive charges, even though the actual charges that move are electrons, which are negatively charged. Electric current can be direct current (DC), where the flow of charge is in one direction, or alternating current (AC), where the direction of flow periodically changes.

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The net force on the charge at A should be zero, the charge q should be negative, since the charges at B and C are negative. Therefore, the charge q should be -2.25 μC placed at the midpoint M of side BC.

What is Charge?

In physics, charge refers to a fundamental property of matter that describes how it interacts with electric and magnetic fields. All matter is made up of atoms, which in turn are composed of positively charged protons, negatively charged electrons, and neutral neutrons. Charge is carried by the electrons and protons in an atom, and it is measured in coulombs (C).

To keep the charge at point A in equilibrium, the net force on it due to the other charges should be zero. This means that the net force due to charges at B and C should balance each other out.

Let's assume that the charge q is placed at the midpoint M of side BC. We need to find the magnitude and sign of q such that the net force on the charge at A is zero.

Let's first calculate the distance between A and M. Since the triangle is equilateral, all sides are equal to 20 cm.

AM = BC/2 = 10 cm

Now, we can calculate the force on the charge at A due to the charge q at M using Coulomb's law:

F(AM) = k * (2q) / AM^2

where k is the Coulomb's constant.

Similarly, we can calculate the forces on the charge at A due to the charges at B and C:

F(AB) = k * (2 * (-3)) / AB^2

F(AC) = k * (2 * (-3)) / AC^2

Since the triangle is equilateral, AB = AC = 20 cm.

Now, let's consider the x-component of the net force on the charge at A. Since the charges at B and C are symmetrically placed with respect to the y-axis passing through A, the y-component of their forces will cancel out. Therefore, we only need to consider the x-component of their forces:

Fx(net) = F(AM) * cos(60) + F(AB) + F(AC)

where cos(60) = 1/2 is the cosine of the angle between the vectors AM and F(AM).

Since the net force on the charge at A should be zero, we have:

Fx(net) = 0

Substituting the values of F(AM), F(AB), F(AC), and cos(60), we get:

k * (2q) / AM^2 - k * 6 / AB^2 - k * 6 / AC^2 = 0

Simplifying this equation, we get:

2q = 9/2

Therefore, the magnitude of the charge q that needs to be placed at the midpoint M of side BC is:

|q| = 9/4 = 2.25

Since the net force on the charge at A should be zero, the charge q should be negative, since the charges at B and C are negative. Therefore, the charge q should be -2.25 μC placed at the midpoint M of side BC.

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The acceleratiοn οf a prοjectile when it reaches its highest pοint is 0 m/s². And its acceleratiοn just befοre and just after reaching this pοint 10.39 m/s² at time 2.08 s.

The speed at which an οbject travels when gravity exerts its first fοrce οn it is referred tο as its initial velοcity. In cοntrast, the speed and directiοn οf a mοving οbject fοllοwing its maximum acceleratiοn are measured by the final velοcity, a vectοr quantity.

The twο cοmpοnents οf a vectοr are used tο describe the single directiοn οf the vectοr's influence. The initial velοcity οf a prοjectile has bοth a hοrizοntal and a vertical cοmpοnent if it is launched at an angle tο the hοrizοntal.

Let's determine the [tex]\theta[/tex] angle of launch with respect to the positive x-axis.

[tex]\theta = 180^o-60.0^o = 120^o \\[/tex]

We will determine the particle's time οf flight from the equation of the vertical displacement of a prοjectile.

[tex]y = v_i\,\sin (\theta) \,t_g - \dfrac{1}{2} g\, t_g ^2 \,\,\,\,\,\,\,(1)\\[/tex]

Where:

y is the vertical displacement, [tex]{v_i[/tex] is the initial speed. [tex]\theta[/tex] is the launch angle. [tex]t_g[/tex] is the flight time. g is the acceleration due tο gravity.

If the initial vertical position is equal tο the final vertical position, then the vertical displacement is equal tο zero.

Substituting the known data in equatiοon (1)

[tex]\rm 0 = (12.0\,m/s)\sin (120^o)t_g - \dfrac{1}{2}(10\,m/s^2)}t_g ^2\\ 0 = {\rm 10.3923\,m/s^2 -(5\,m/s^2)}t_g \\[/tex]

[tex]\rm t_g = \dfrac{\rm 10.3923\,m/s^2}{\rm 5\,m/s^2} = {\rm 2.08\,s} \\[/tex]

Thus, The acceleration of a prοjectile when it reaches its highest point is 0 m/s². And its acceleratiοn just before and just after reaching this point 10.39 m/s² at time 2.08 s.

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Answer:

D water molecules tend to stick together.

Explanation:

a water molecule consists of 1 oxygen atom and 2 hydrogen atoms. because of the oxygen atom, this makes water electronegative, giving the hydrogen side a partial charge and the oxygen side a partial negative charge, making the water molecule polar. the oxygen is attracted to hydrogens, and the hydrogens are attracted  to oxygens creating hydrogen bonds. hence the answer is D the water molecules tend to stick together.

The 2.4 m/s² acceleration would be produced by the same force applied to a 13.4 kg mass.

What is acceleration ?

The pace at which speed changes is known as acceleration. Acceleration typically, but not always, indicates a change in speed. Because the direction of an object's velocity is shifting even while it follows a circular course, it continues to accelerate.

What is force?

A body can change its state of rest or motion when an external force acts on it. It is directed and has a magnitude.

As we know that force= mass × acceleration

So F₁=m₁×4

F₂=m₂×6

now for combined system total acceleration will be "a"= F/ m₁+m₂

m₁= F/4

m₂= F/6

so put the value of m₁ and m₂

​Therefore, 2.4 m/s² acceleration would be produced by the same force applied to a 13.4 kg mass.

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For eligible renewable energy technology and projects, a number of tax credits, grants, and loan programmes are offered by the federal government.

Fossil fuels are burned to produce energy, which produces a sizable amount of greenhouse gas emissions that contribute to global warming. Even when taking into account the entire life cycle of the technologies, the majority of renewable energy sources produce negligible to no emissions.

Subsidies have helped reduce dependency on fossil fuels by expanding the use of renewable energy sources. This is crucial for lowering greenhouse gas emissions and preventing an increase in global temperatures.

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Answer:

The speed of a wave (v) is equal to the product of its wavelength (λ) and frequency (f), i.e., v = λf. Rearranging this equation, we get:

λ = v/f

Substituting the given values, we get:

λ = 2.3 m/s / 5 Hz

λ = 0.46 meters

Therefore, the wavelength of the water wave is 0.46 meters.

Explanation:

Answer:

The wavelength is 0.46 meters.

Explanation:

The speed of a wave is given by the formula:

v = λf

where v is the wave speed, λ is the wavelength, and f is the frequency.

We are given v = 2.3 m/s and f = 5 Hz. Rearranging the formula above to solve for λ, we get:

λ = v/f

Substituting the given values, we get:

λ = 2.3 m/s / 5 Hz = 0.46 m

Therefore, the wavelength of the water wave is 0.46 meters.

The wavelength of the standing wave λ = 40cm

A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in consecutive cycles.

Its length is typically defined in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).

How to solve:

We know the distance between two successive nodes = λ / 2

From the figure distance between two successive nodes = 20 cm

i.e. λ / 2 = 20 cm

∴ The wavelength of the standing wave λ = 40cm

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Answer: The kilogram, symbol kg, is the SI unit of mass.

Explanation: It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10-34 when expressed in the unit J s, which is equal to kg m2 s-1, where the meter and the second are defined in terms of c and ΔνCs.

Answer: The answer is kilogram (kg)

Explanation:

Answer:

We can use conservation of momentum and conservation of energy to solve this problem.

Conservation of momentum:

Initial momentum = final momentum

m1v1 + m2v2 = (m1 + m2)v'

where m1 = 20 g = 0.02 kg, v1 = 10 m/s, m2 = 40 g = 0.04 kg, v2 = 0, v' is the final velocity of both balls after collision.

Solving for v':

v' = (m1v1 + m2v2)/(m1 + m2)

v' = (0.02 x 10 + 0.04 x 0)/(0.02 + 0.04)

v' = 6.67 m/s

Conservation of energy:

Initial kinetic energy = final kinetic energy

(1/2)m1v1^2 + (1/2)m2v2^2 = (1/2)(m1 + m2)v'^2

where v' is the final velocity calculated from conservation of momentum.

Solving for the total change in kinetic energy:

ΔKE = (1/2)(m1v1^2 + m2v2^2) - (1/2)(m1 + m2)v'^2

ΔKE = (1/2)(0.02 x 10^2 + 0.04 x 0^2) - (1/2)(0.02 + 0.04) x 6.67^2

ΔKE = -0.518 J

Therefore, the answer is (E) -518 x 10^-1.

The correct matches of the terms are Absolute zero represents the absence of thermal energy, heat is the transfer of energy, temperature measures the intensity of heat, and latent heat is involved in phase changes.

1. Absolute zero is the temperature at which a substance has no kinetic energy per particle to give up. Absolute zero is the lowest possible temperature, at which all molecular motion ceases.

2. Heat is the energy transferred from one object to another due to a temperature difference. Heat is the transfer of thermal energy from a hotter object to a colder object.

3. Temperature is the degree of hotness or coldness of a body or environment. Temperature measures the average kinetic energy of the particles in a substance, indicating how hot or cold it is.

4. Latent heat is the energy released or absorbed by a substance during a change of state. Latent heat is the heat energy absorbed or released when a substance undergoes a change of state, such as melting, vaporization, or condensation, while the temperature remains constant.

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(a) We can find the components of the acceleration of the fish by using the following kinematic equation:

v = u + at

where u is the initial velocity, v is the final velocity, a is the acceleration, and t is the time interval.

Let's find the acceleration of the fish in the x-direction first:

v_x = u_x + a_xt

where v_x is the x-component of the final velocity, u_x is the x-component of the initial velocity, a_x is the x-component of the acceleration, and t is the time interval.

Substituting the given values, we get:

23.0 = 4.00 + a_x * 19.0

Solving for a_x, we get:

a_x = (23.0 - 4.00) / 19.0 = 0.895 m/s^2

Similarly, we can find the acceleration of the fish in the y-direction:

v_y = u_y + a_yt

where v_y is the y-component of the final velocity, u_y is the y-component of the initial velocity, a_y is the y-component of the acceleration, and t is the time interval.

Substituting the given values, we get:

-1.00 = 1.00 + a_y * 19.0

Solving for a_y, we get:

a_y = (-1.00 - 1.00) / 19.0 = -0.105 m/s^2

Therefore, the components of the acceleration of the fish are:

a_x = 0.895 m/s²

a_y = -0.105 m/s²

The rate of change of velocity of an object over the course of time is defined as acceleration.  It is a vector quantity, that also means it has magnitude as well as direction. Acceleration occurs when an object changes its velocity, either by increasing or decreasing its speed or by changing its direction of motion. The following formula may be utilized to calculate an object's acceleration:

a = (v_f - v_i) / t

(b) To find the direction of the acceleration with respect to unit vector î, we can use the following formula:

θ = tan⁻¹(a_y / a_x)

Substituting the values we just found, we get:

θ = tan⁻¹(-0.105 / 0.895) = -6.84°

Therefore, the direction of the acceleration with respect to unit vector î is 6.84° clockwise from the +x-axis.

(c) To find the position of the fish at t = 26.0 s, we can use the following kinematic equations:

x = u_xt + 0.5 a_xt²

y = u_yt + 0.5 a_yt²

where x is the position in the x-direction, y is the position in the y-direction, u_x is the initial velocity in the x-direction, u_y is the initial velocity in the y-direction, a_x is the acceleration in the x-direction, a_y is the acceleration in the y-direction, and t is the time interval.

Let's first find the position of the fish in the x-direction:

x = u_xt + 0.5 a_xt²

Substituting the given values, we get:

x = 14.0 + 0.5 * 0.895 * (26.0 - 19.0)² = 37.4 m

Similarly, we can find the position of the fish in the y-direction:

y = u_yt + 0.5 a_yt²

Substituting the given values, we get:

y = -2.80 + 0.5 * (-0.105) * (26.0 - 19.0)²= -3.17 m

Therefore, the fish is at the position (37.4 m, -3.17 m) at t = 26.0 s.

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The angle of incidence for the light ray passing from water into diamond is approximately 68.1 degrees.

What is Incidence Ray?

An incident ray is a term used in optics to describe a beam of light that is traveling towards a surface or boundary where it will be either absorbed, reflected, or refracted. When an incident ray encounters a boundary between two different media with different refractive indices, some or all of the ray's energy may be reflected back into the original medium, some may be absorbed, and some may be transmitted into the second medium.

To solve this problem, we can use Snell's law, which relates the angle of incidence and the angle of refraction of a light ray passing from one medium to another:

n1sin(theta1) = n2sin(theta2)

where n1 and n2 are the refractive indices of the two media, and theta1 and theta2 are the angles of incidence and refraction, respectively.

In this case, the light ray is passing from water (n1 = 1.333) into diamond (n2 = 2.417), and we are given that the ratio of the sines of the angles of incidence and refraction is r = sin(theta2)/sin(theta1) = 14.

n1sin(theta1) = n2sin(theta2)

sin(theta2) = r*sin(theta1)

n1/n2 * sin(theta1) = r*sin(theta1)

sin(theta1) = rn2/(n1 + rn2)

theta1 = arcsin(rn2/(n1 + rn2))

Plugging in the values for n1, n2, and r, we get:

theta1 = arcsin(142.417/(1.333 + 142.417))

theta1 = 68.1 degrees

Therefore, the angle of incidence for the light ray passing from water into diamond is approximately 68.1 degrees.

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Column B should be renamed as Mechanical waves.

Transverse waves require medium to travel while longitudinal waves doesn't require a medium.

Transverse waves can be polarized while longitudinal waves cannot be polarized.

Transverse waves consists of crests and troughs while longitudinal waves consists of compressions and rarefactions.

Here,

In column B include waves that could be both transverse and longitudinal and requires a medium to travel and also it includes sound. So these are the properties of mechanical waves.

Hence,

Column B should be renamed as Mechanical waves.

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The drag force created by the parachute can be calculated using the equation F = 0.5 * ρ * A * V2, where ρ is the density of the air, A is the area of the parachute, and V is the velocity of the rocket.

Parachute is an aircraft device used to slow down a person or object's fall during a jump or a descent from a significant height. The device consists of a canopy made of fabric or nylon which is attached to a harness. The canopy is designed to fill with air as it descends, thus providing drag to slow the descent. Parachutes are commonly used by skydivers and BASE jumpers, as well as by military forces to safely deploy personnel and equipment.

In this case, the density of the air is 1.225 kg/m3, the area of the parachute can be estimated based on the size of the rocket, and the velocity of the rocket can be calculated using the formula V = at, where a is the acceleration and t is the time it takes for the rocket to reach the ground.

Assuming the rocket is launched at an initial velocity of 0 and the time it takes to reach the ground is 5 seconds, then the velocity of the rocket is 10 m/s.

Therefore, the drag force created by the parachute is calculated as:

F = 0.5 * 1.225 kg/m3 * (estimated area of parachute) * (10 m/s)2

F = 0.5 * 1.225 kg/m3 * (0.1 m2) * (10 m/s)2

F = 6.1375 N

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The 25 size in millimeters of the smallest insect that the bat can detect.

What is wavelength ?

The distance between identical points (adjacent crests) in adjacent cycles determines how far a waveform signal has travelled in space or over a wire. In wireless systems, this length is often expressed in metres (m), centimetres (cm), or millimetres (mm).

What is speed ?

The rate of a directionally changing object's location. The SI unit of speed is created by combining the fundamental units of length and time. Meters per second (m/s) is the unit of speed in the metric system.

Therefore, 25 size in millimeters of the smallest insect that the bat can detect.

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Density of the plastic is 0.9 g/cm³.

The type of plastic collected are yogurt cups and plasticwares.

Density of a substance is defined as the mass per unit volume of the substance.

Here,

Mass of the plastic, m = 2.2 g

Volume of the plastic, V = 2.5 cm³

So, density, ρ = m/V

   ρ = 2.25/2.5

   ρ = 0.9 g/cm³

Recyclable plastics are sorted on the basis of their densities. Here, the density of the collected plastic is 0.9 g/cm³. So, the plastic material must be  yogurt cups and plasticwares.

Hence,

Density of the plastic is 0.9 g/cm³.

The type of plastic collected are yogurt cups and plasticwares.

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Answer:

45.9 kg

Explanation:

GPE = mgh

m = GPE / gh = (1800 J) / (9.8 m/s²)(4 m) = 45.9 kg

Assuming the car is driving across a flat road with no air resistance, the direction of net force acting on the car will depend on the direction of the car's motion and the forces acting on it.

If the car is traveling at a constant velocity, then the net force acting on it is zero. This is because the forces acting on the car - such as the force of the engine, friction from the tires, and air resistance - are balanced and cancel each other out. However, if the car is accelerating or decelerating, then there is a net force acting on it. For example, if the car is accelerating forward, then the net force acting on it is in the forward direction. This is because the force of the engine pushing the car forward is greater than the opposing forces, such as air resistance and friction. Similarly, if the car is decelerating, then the net force acting on it is in the opposite direction of its motion. This is because the opposing forces are greater than the force of the engine, causing the car to slow down.

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