Answer:
Explanation:
The slope of the graph is the spring constant n/m
1. A positively charged object with a charge of +85 nC is being used to balance the downward force of gravity on a 1.8-gram balloon that has a charge of -63 nC. How high above the balloon must the object be held to balance the balloon?
The distance above the balloon that the positively charged object must be held to balance the balloon is 5.2 cm.
Force between the charges
The force between the charges is determined by applying Coulomb's law.
F = kq₁q₂/r²
Downward force of gravityThe downward force of gravity of the balloon is given as;
F = mg
When the two forces balances, the distance between the charges is calculated as follows;
[tex]mg = \frac{kq_1q_2}{r^2} \\\\r^2 = \frac{kq_1q_2}{mg} \\\\r = \sqrt{\frac{kq_1q_2}{mg} } \\\\r= \sqrt{\frac{(9\times 10^9)(85 \times 10^{-9})(63\times 10^{-9})}{(1.8 \times 10^{-3} \times 9.8)} } \\\\r = 0.052 \ m\\\\r = 5.2 \ cm[/tex]
Thus, the distance above the balloon that the positively charged object must be held to balance the balloon is 5.2 cm.
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Which of the following distinguishes light waves from mechanical waves?
A. Light waves are not really waves, they are streams of fast moving particles.
B. Light waves carry much more energy than mechanical waves.
C. Light waves cannot be reflected or refracted.
D. Light waves can carry energy through empty space.
Answer:
Im pretty sure it's B. but im not 100% sure sry
Explanation:
Hello people ~
The electric potential of earth is taken as:
(a) zero
(b) infinity
(c) unity
(d) None of these
Answer:
(a) zero
lmk if im wrong :)
Answer:
zero
Explanation:
Earth is a spherical objectThe charge is injected from.the centre of earthAs the radius remains same every charge gets neutralized .
Hence net charge is zero
Ty is three years old and as a result of a “stomach bug" has been vomiting for
about 24 hours. His blood pH is 7.48. What does this mean?
Ty's blood is slightly acidic.
Ty's blood is slightly alkaline.
Ty's blood is highly acidic.
Ty's blood is within the normal range Option 1
Answer:
Ty's blood is slightly alkaline
Explanation:
a car accelerates from 20 m/s to 40 m/s in 10 s and its forward thrust is equal to 3 kN, what is the mass of
A car that has a forward thrust of 3kN and accelerates from 20 m/s to 40 m/s in 10 s has a mass of 1500 kg. Thus, the mass of the car is the 1500 kg
Newton's 2nd law of motionFrom the question, we are to calculate the mass of the car.
From Newton's second law of motion, we have that
F = ma
Where F is the Net force
m is the mass
and a is the acceleration
Also, from one of the equations of linear motion, we have that
v = u + at
Then, we can write that
[tex]a = \frac{v-u}{t}[/tex]
Where v is the final velocity
u is the initial velocity
a is the acceleration
and t is the time taken
Therefore,
[tex]F = m\frac{(v-u)}{t}[/tex]
From the given information,
u = 20 m/s
v = 40 m/s
t = 10 s
F = 3 kN = 3000 N
Putting the parameters into the equation, we get
[tex]3000 = m \frac{(40-20)}{10}[/tex]
[tex]3000 = m \times \frac{20}{10}[/tex]
3000 = 2m
Then,
m = 3000 ÷ 2
m = 1500 kg
Hence, the mass of the car is the 1500 kg.
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A warehouse has a pulley system to move stuff. A technician uses the pulley to lift a 500.0 kg box of material from floor to the top shelf, 3.50 m up. The force on the chain is 10 000. N applied through a distance of 4.50 m. What is the efficiency of the pulley?
Answer: 38% efficiency
Explanation:
Given:
- Mass of box, 500.0kg
- Height lifted, 3.50m
- Force Applied, 10 000N
- Distance applied, 4.50m
Required:
% Efficiency, can be found through formula η = [useful energy output (Eout) ÷ energy input (Ein)] x100%
To calculate Eout, you need to find which energy transferred to the box is useful. In this case, it is the gravitional potential energy, which can be found by the formula Eg = mgh, where Eg = (500.0)(9.8)(3.50) = 17150J.
To calculate Ein, find the total energy that was inputted to the object, given by W = FΔd, where W = 45000J.
Now, plug in the values to the %eff formula:
(17150J ÷ 45000J) x100% ≈ 38%
Therefore % efficiency of the pulley is 38%.
newton’s laws 8th grade science
Answer:
hB djJS E DIS SIS. AHA. SDI DVZ SIS.Zsjsnw
In the absence of air resistance, why does the horizontal component of velocity for a projectile such as a
bullet remain constant while the vertical component changes?
Explanation:
The vertical velocity changes because gravity is what brings the ball downwards, since gravity is what cause acclereation in free fall, acclereatiin will make the velocity become more negative.
There is no force happening on the ball in the horinzontal direction so according to Newton 1st law, the ball will remain in constant velocity n the horinzotnal direction.
When a car suddenly stops at a red light, a book lying on the car seat slides forward. Why does the book continue to move forward?.
Answer:
The book's inertia causes it to continue moving.
Inertia can be defined as the tendency of an object such as a book to continue in its state of motion or remain at rest, unless it is acted upon by an external force.
Explanation:
Does this help you???
A boy skips a rock so that it bounces off the water with a velocity of 3. 5m/s at 40. 0 degrees. How long will it take to hit the water again?
Since the rock has a velocity of 3.5m/s at 40.0°, it will take the rock 0.46 s to hit the water again.
Since the rock is a projectile, we use the time of flight of a projectile to find the time it hits the water again
Time of flight of projectile.The time of flight of the rock is given by T = 2UsinФ/g where
u = velocity of stone = 3.5 m/s, Ф = angle of projection = 40.0° and g = acceleration due to gravity = 9.8 m/s².Substituting the values of the variables into the equation, we have
T = 2UsinФ/g
T = 2 × 3.5 m/s × sin40.0°/9.8 m/s².
T = 7.0 m/s × 0.6428/9.8 m/s².
T = 4.4995 m/s ÷ 9.8 m/s²
T = 0.459 s
T ≅ 0.46 s
So, it will take the rock 0.46 s to hit the water again.
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A puck moves 2.35 m/s in a -22 degree direction. A hockey stick pushes it for 0.215 s, changing its velocity to 6.42 m/s in a 50 degree direction. What is the magnitude of acceleration
For a puck moves 2.35 m/s in a -22 degree direction. A hockey stick pushes it for 0.215 s, changing its velocity to 6.42 m/s in a 50 degree direction the magnitude of the acceleration is mathematically given as
θ=71.4
What is the magnitude of acceleration?
Generally, the equation for the initial velocity of the puck is mathematically given as
v1=v1cosαi+v1sinαj
v1=(2.35)cos(−22.0)i+(2.35m)sin(−22.0)j
v1=2.1788820582i−0.8803254945j
v2=(6.42)cos(50.0)i+(6.42)sin(50.0)j
v2=4.1266964542i+4.9180053248j
hence,
a=v2−v1/Δt
[tex]a=(4.1266964542i+4.9180053248j) - (2.1788820582i-0.8803254945j)/0.215s[/tex]
a= 9.0596018419i+26.968980555j
In conclusion, the magnitude of acceleration
θ=tan−1(26.968980555/9.0596018419)
θ=71.431423019
θ=71.4
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What’s the difference between expressed/implied powers, concurrent powers, and reserved powers?.
Answer:
A reserved power is a power specifically reserved to the states. Powers include setting up local governments and determining the speed limit. A concurrent power is a power that is given to both the states and the federal government.
Explanation:
a 1200 kg car travels at 20 m/s
if the car slows to a stop what is its final momentum?
Answer:
No motion, so momentum = zero
Explanation:
How or when does Harley Quinn demonstrate or defy the law of physics? Is there a scene where she demonstrates/defies the laws of physics? Do her abilities defy/demonstrate the law of physics?
Harley Quinn uses her baseball bat with 100% efficiency which defies the law of physics as no tool is 100% efficient.
Who is Harley Quinn?Harley Quinn is a villain in the comics as well as the adapted movie suic_ide squad.
Harley Quinn's choice weapon is a mallet which she later loses for a baseball bat during a fight she got in.
Harley Quinn does not possess any superpowers, but she uses her bat so well that it defies some of the laws of physics.
For example, no tool or machine is 100% efficient, yet Harley Quinn uses her bat with 100% efficiency, thus defying the law of physics.
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Which type of energy does a ball thrown in the air have at its highest point?.
Answer:
Potential Energy
Explanation:
Potential Energy is the required answer
We've discussed elevators that are raised with cables, but many elevators use pistons. A pump provides fluid at very high pressure to the piston; the resulting force on the piston raises the elevator and passengers. For a typical piston elevator, the mass of the elevator and passengers is 2000 kg and the radius of the piston is a surprisingly small 4. 2 cm. The elevator begins to move upward, accelerating at 0. 80 m/s2. What is the absolute pressure in the piston?
[tex]p = \frac{f}{s} [/tex]
[tex]f = ma = 2000 \times 0.8 = 1600[/tex]
[tex]s = \pi \: r {}^{2} = 3.14 \times 4. {2}^{2} \times 10 {}^{ - 4} = 55.42 \times 10 {}^{ - 4} [/tex]
[tex]p = \frac{1600}{55.42 \times 10 {}^{ - 4} } = 288 \: 704 \: pascal[/tex]
The absolute pressure in the piston is 288704 pascal.
What is pressure?The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.
Given in the question the mass of the elevator and passengers is 2000 kg and the radius of the piston is a surprisingly small 4. 2 cm. The elevator begins to move upward, accelerating at 0. 80 m/s².
Pressure = Force/area
Pressure = mass. acceleration/area
Pressure = 2000*9.8/0.005542
Pressure = 288704 pascal
The absolute pressure in the piston is 288704 pascal.
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can anyone please solve this question for me i will give you 100 points please
Answer:
initial velocity= v(1 - 1/(1 + (pi)r^2dp(m/M) )
Explanation:
1st: Write the equation initial velocity=v( 1 - 1/(1 + pi x r^2 x d x p x m/M)
Secondly: Plug in the variables initial velocity= v( 1 - 1/(1 + (pi)r^2dp(m/M) )
You need to give me the variable amounts to find the initial velocity.
What fraction of a given amount of hydrogen-3 would be left after 36.9 years of decay?
Answer:
10
Explanation:
Describe the overall trends you see in the employment graph. give your answer in the form of at least two complete sentences.
Answer:
The graph demonstrates two major trends. First, employment numbers began to drop sharply in 2008. These numbers fell until 2010, when they reached a trough. Employment began to rise again after this point and continued to rise into 2013.
Explanation:
Item 3
What causes an electric current in a wire?
Electrons flow because of electrical attraction and repulsion.
Electric fields cause atoms to move in the wire.
Electrons build up in the wire and create a charge.
Electrons move because of heat.
Answer:
A
Explanation:
The definition of current is the differential change in charge over a differential change in time. In the case of the wire, a source, say a battery, sends electrons from one terminal to another terminal. The medium through which these electrons move is the wire. Therefore, the charge flowing through the wire over time creates an electric current, by definition.
Which object is the light most likely striking? a window a mirror a plaster wall a steel beam
Answer:
Explanation:
window!
The light most likely strikes on a window.
What is meant by refraction?Refraction of light is defined as the bending of light when it travels from one medium to another.
Here,
When light falls on a smooth, reflecting surfaces like glass, mirror, water, it gets bounced back. This is known as the reflection of light.
But when a light ray strikes on the surface like, a window, the light will get refracted and as a result, when it passes through the glass, the path of the light is changed.
The light undergoes refraction twice, as the light enters and gets escaped from the window.
Hence,
The light most likely strikes on a window.
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Explain what sportsmanship means to you
thx u if you anwers this question I will give 100 points and brainly
Answer:fair and generous behavior or treatment of others, especially in a sports contest.
Explanation: hope this helps !
Exercise: How long must a 1500 N force act on a car to give it a momentum of 56 000 kg-m/s starting from rest?
Question:
How long must a 1500 N force act on a car to give it a momentum of 56000 kg-m/s starting from rest?
Find out key variables:
Force: 1500 N
Momentum: 56,000 kg-m/s
Recall the formula: ΔMomentum (kg m/s) = Force (N) x Time Taken (s)
Solve:
56,000 = 1500 x time taken
time taken = 56,000/1500
time taken = 112/3
time taken = 37.33 seconds
can you get very smart?
Actually according to physics there should be needed a force to move things but our mind does not produce a force ...Apart from myths ...is seems quite impossible to move a object with ur mind
-Thanks for reading
The gravitational force between two masses separated by a distance is F. The magnitudes of two masses are doubled and distance between them is reduced to half of the initial distance. The gravitational force between them will be:
[A] F
[B] 2F
[C] 4F
[D] 16F
Answer:
F = G M m / R^2
F1 = G M m / R1^2
F2 = 4 G M m / R2^2
F2 / F1 = 4 * (R1 / R2)^2 = 4 / (1/2)^2 = 16F2 = 16 F1
Why does an aqueous solution of an ionic substance conduct an electric current?.
Answer: Because ions in an aqueous solution are free to move independently from each other. the net flow of cations toward a negative or positive electrode results in a flow of charge, which is an electrical current.
Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?.
It implies that the universe is expanding, and so is the fabric of space-time.
Think of a balloon with stickers on it.
As you blow the balloon bigger and bigger, the stickers will get further apart!
How does the work done on a machine compare to the work done by a machine?
Answer:
How does the work done on a machine compare to the work done by a machine? Because of friction, the work done by a machine is always less than the work done on the machine. What changes can a machine make to a force? Size of force; direction of force; distance through which a force acts.
A gas of certain mass occupies a volume of 650cm3 under a pressure of 750mm hg. calculated the pressure under which the volume of the gas will be reduced by 10 percents of its original volume???
Answer:
just know that if the volume is reduced by 10 the the pressure is increased by 10
Any measurement that includes both magnitude and direction is called an
Answer:
Vector Quantity
Explanation:
i dont know how to explain it my g