Three people are trying to move a box. Which set of forces will result in a net
force on the box of 20 N to the right?
A.
B.
O C.
O D.
18 N
55 N
55 N
6 N
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1₂
28 N
16 N 17 N
0
10 N
17 N
$
16 N
-
20 N
6 N



Correct answer is A

Answer: Newton's law of universal gravitation states that every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Explanation:

Answer: Option  d) 2.2 × 10³ N is the correct answer

Explanation:

Given that;

radius of A₁ = 5.0

large piston has a radius of A₀ = 15 cm

Weight F₀ = 20,000 N

Force that must be applied to lift the weight F₁ = ?

Now we know that from Pascal Law

ΔP ⇒ F₁/A₁ = F₀/A₀

F₁ =  (F₀/A₀)A₁

where A = πr²

so we substitute

F₁ =  (20,000 / π(15²)) × π(5²)

= (20,000 / 706.8583) × 78.5398

= 2222.22 ≈ 2.2 × 10³ N

Therefore Option  d) 2.2 × 10³ N is the correct answer.

Answer: because it makes it bigger so scientists would discover more about viruses

Explanation:

As the board is raised by an angle θ, the block will be held in place by 3 forces:

• its weight, pointing downward (magnitude w )

• the normal force of the board pushing up on the block, pointing in the direction perpendicular to the board (mag. n)

• static friction, pointing in the direction parallel to the board, opposite the direction the block would slip (mag. f )

Decompose the vectors into components that are parallel and perpendicular to the board (taking the direction of n to be the positive direction perpendicular to the board, and the direction of f to be the negative directoin parallel to it), so that by Newton's second law, we have

• net parallel force:

∑ F = w (//) + f

∑ F = m g sin(θ) - µ n = 0

where µ = 0.45 is the coefficient of static friction, g = 9.80 m/s² is the mag. of the acceleration due to gravity, and m = 15.0 kg is the mass of the block.

• net perpendicular force:

∑ F = n + w (⟂)

∑ F = n - m g cos(θ) = 0

Solve for n in the equation for net perpendicular force:

n = m g cos(θ)

Substitute this into the equation for net parallel force:

m g sin(θ) - 0.45 m g cos(θ) = 0

Solve for θ :

sin(θ) - 0.45 cos(θ) = 0

sin(θ) = 0.45 cos(θ)

tan(θ) = 0.45

θ = tan⁻¹(0.45)

θ ≈ 24.2°

So the maximum angle the board can be lifted before the block starts to slide is about 24.2°, since the coefficient of static friction µ is such that

f = µ n

where f is the maximum magnitude of the static friction force.

The temperature of the furnace is 585-degree Celcius.

An expression for hotness or coolness on any scale, including Fahrenheit and Celsius, is called a temperature. Heat energy will logically go from a hotter (body with a higher temperature) to a colder (body with a lower temperature) according to temperature (one at a lower temperature).

Food, beverages, agriculture, and medical care—for both people and animals—all depend heavily on temperature. Temperature also frequently affects our general health in a number of ways. In facilities used for medical cold storage, maintaining optimum temperatures is crucial. The Celsius and Kelvin scales are used in chemistry to express temperature. The Celsius temperature multiplied by 273.15 is the temperature on the Kelvin scale. Absolute zero, denoted by the number 0 K, is the lowest temperature that is conceivable.

instead of 0.75 g, I assume 75 g.

c, water = 4.18 j/g°C

c, glass = 0.84 j/g°C

c, copper = 0.39 j/g°C

Q,given = Q,taken

mcΔt(copper) = mcΔt(glass) + mcΔt(water)

75*0.39*(t–27) = 300*0.84*(27–12) + 200*4.18*(27–12)

t = 585°C

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Answer:

mass

Explanation:

Answer: Mass is the amount of mass an object contains. Mass is measured using a scale. Volume is the amount of space matter takes up.

hope this help!! :) :)

Answer:

Light travels as a wave. But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. It speeds through the vacuum of space at 186,400 miles (300,000 km) per second.

Explanation:

Hope this helps :))

Two vectors are parallel when the angle between them is either 0° (the vectors point in the same direction) or 180° (the vectors point in opposite directions).

In both mathematics and physics, the term "vector" is used informally to describe certain quantities (also known as "scalars") that cannot be described by a single number or by the constituent parts of some vector spaces.

Historically, vectors were introduced in geometry and physics (usually in mechanics) for things like displacements, forces, and velocity that have both a magnitude and a direction. Similar to how lengths, masses, and time are represented by real numbers, these quantities can be thought of as geometric vectors.

Tuples, which are finite sequences of numbers with a definite length, are also referred to as vectors in some settings.

Tuples and geometric vectors may both be added to and scaled, and the idea of a vector space is a result of these vector operations.

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Answer:

18 newtons

Explanation: I'm taking that class

Answer:

a = - 1.47 [m/s²], descending or going down

Explanation:

To solve this problem we must use Newton's second law which tells us that the sum of forces on a body is equal to the product of mass by acceleration.

∑F = m*a

where:

∑F =  Forces applied [N]

m = mass = 10 [kg]

a = acceleration [m/s²]

Let's assume the direction of the upward forces as positive, just as if the movement of the box is upward the acceleration will be positive.

By performing a summation of forces on the vertical axis we obtain all the required forces and other magnitudes to be determined.

[tex]-m*g + N = m*a\\[/tex]

where:

g = gravity acceleration = 9.81 [m/s²]

N = normal force measured by the scale = 83.4 [N]

Now replacing:

[tex]-(10*9.81)+83.4=10*a\\-14.7=10*a\\a=-1.47[m/s^{2} ][/tex]

The acceleration has a negative sign, this means that the elevator is descending at that very moment.

Answer: x=-22

Explanation:

f=final position

-45=f-23

-45+23=f

f=-22

x=-22

Answer:

t = 1400 s

Explanation:

Given that,

Distance covered, d = 350 km = 350000 m

Speed of the object, v = 25 m/s

We need to find the time it takes to do that. Let the time is t. The formula for the speed of an object is given by :

v = d/t

i.e.

[tex]t=\dfrac{d}{v}[/tex]

Putting all the values,

[tex]t=\dfrac{350000}{25}\\\\=1400\ s[/tex]

So, the time taken by it is 1400 seconds.

Answer:

178.5 Hz

Explanation:

Given that a  car approaches a train station with a speed of 24 m/s. A stationary train at the station sounds its horn which has a frequency of 166 Hz. What frequency of sound is heard by the car's driver ?

Solution

Using doppler effect formula

F = f ( V/ V- v)

Where F = frequency of sound heard by the car

f = train frequency

V = speed of sound

v = car speed

F = 166 ( 343 ÷ ( 343 - 24 ) )

F = 166 ( 343 / 319 )

F = 166 × 1.0752

F = 178.489 Hz

F = 178.5 Hz

Therefore, the frequency of sound heard by the observer in the car is 178.5 Hz approximately.

In most cases, the actions of people could be based on distorted feedback.

We know that self perception and self concept is very important. In psychology, it is often very vital to deal with how a person sees himself as this could be the catalyst of the actions of the person. Let us also recall that people do not often act in isolation of the past. This is why some people are said to be the prisoners of the past. They can not just let go of their past failings and mistakes This could have a very bad impact on then future endeavors of such a person.

Let us put this in the context of our discussion. It is common perception that the past of a person could determine the current or future performances of a person. This is common in recruitment exercises.

This implies that when people tend to act, they tend to act based on distorted feedback.

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Answer:  54.12 m

Explanation:

Answer:

B

Explanation:

The slope (change in position over the change in time) represents the speed, or velocity. If the slope is linear, then that means that the velocity is not changing. It is like a constant rate. If you had a curvy line, then the change in position over change in time would also be changing, i.e. the velocity is changing.

Answer:

velocity

Explanation:

acceleration is defined as the rate of change of velocity

Answer: The correct option is D) 14

Explanation:

A transformer is a device used for stepping- up or stepping- down an alternating voltage. It has both primary and secondary windings. Energy is usually supplied through the primary coil and delivered through the secondary coil in a transformer. Using the equation:

Ns= lp

Np= Is

Where Ns--> number of turns in secondary coil

Np--> number of turns in primary coil

Is--> current flow in secondary coil

Ip--> current flow in primary coil.

Therefore Ns= Np Ip/Is

Substituting from the question

Ns= 100×2/14

Ns= 200/14

Ns = 14.28 which is approximately 14 turns in the secondary coil.

Answer:

same for all objects

Explanation:

earth pulls every object by same force of gravity

Answer:

g = 0.85 m[tex]s^{-2}[/tex]

Explanation:

g = [tex]\frac{GM}{h^{2} }[/tex]

were; g is the acceleration due to Earth's gravity, G is Newton's gravitation constant (6.674 x [tex]10^{-11}[/tex] N[tex]m^{2}[/tex][tex]kg^{-2}[/tex]), M is the mass of the earth (5.972 x [tex]10^{24}[/tex] kg), and h is the distance of meteoroid to the earth.

h = 3.40 x R

  = 3.40 x 6371 km

h = 21661.4 km

  = 21661400 m

Thus,

g = [tex]\frac{6.674*10^{-11}*5.972*10^{24} }{(21661400)^{2} }[/tex]

  = [tex]\frac{3.9857 *10^{14} }{4.6922*10^{14} }[/tex]

  = 0.84944

g = 0.85 m[tex]s^{-2}[/tex]

The acceleration due to the Earth's gravitation is 0.85 m[tex]s^{-2}[/tex].

Answer:

The truck and car have the same momentum.

Explanation:

[tex]m_1[/tex] = Mass of car = [tex]2000\ \text{lb}=2000\times0.45359237\ \text{kg}[/tex]

[tex]v_1[/tex] = Velocity of car = [tex]\dfrac{100}{3.6}\ \text{m/s}[/tex]

[tex]m_2[/tex] = Mass of truck = [tex]4000\times0.45359237\ \text{kg}[/tex]

[tex]v_2[/tex] = Velocity of truck = [tex]\dfrac{50}{3.6}\ \text{m/s}[/tex]

Momentum of car

[tex]p_1=m_1v_1\\\Rightarrow p_1=2000\times0.45359237\times \dfrac{100}{3.6}\\\Rightarrow p_1=25199.58\ \text{kg m/s}[/tex]

Momentum of the truck

[tex]p_2=m_2v_2\\\Rightarrow p_2=4000\times0.45359237\times \dfrac{50}{3.6}\\\Rightarrow p_2=25199.58\ \text{kg m/s}[/tex]

Both the truck and car have the same momentum of [tex]25199.58\ \text{kg m/s}[/tex].

Answer:w= 1,750 J

Explanation: w=f x d

w=350 N x 5 m

w= 1,750 J

(pretty sure that’s right)

The work produced by the object to move the car is of 1750 J.

Given data:

The magnitude of force applied on the object is, F = 350 N.

The distance moved by the car is, s = 5 m.

When some magnitude of force is applied on any object to displace it, then the output of the applied force is known as work done. The mathematical expression for the work done is given as,

[tex]W = F \times s[/tex]

Solving as,

[tex]W = 350 \times 5\\\\W = 1750 \;\rm J[/tex]

Thus, we can conclude that the work produced by the object to move the car is of 1750 J.

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Answer:

Due east - 0.42mps

Due west - 0.29mps

Explanation:

So for the 5 meters 12s

and 2 meters 7s

for the first one we will do 12/5 = 2.4

for the second one 7/2 = 3.5

that is the amount of seconds per meter but we want meters per seconds so

5/12 = 0.42mps

2/7 = 0.29mps

Answer:

B a current flowing through a coil of wire :)

Explanation:

Answer:

The average velocity from 1 to 3 seconds is 20 m/s l. X/T = 0 m/1s = zero.

Explanation:

I hope that helped!

Answer:

D. 160 nm

Explanation:

The energy released from n = 3 to n = 1 must be equal to the sum of energies released from n = 3 to n = 2 and from n = 2 to n = 1. Therefore,

Energy of Photon from 3 to 1 = Energy of Photon from 3 to 2 + Energy of Photon from 2 to 1

[tex]\frac{hc}{\lambda} = \frac{hc}{\lambda_{1}} + \frac{hc}{\lambda_{2}}\\\\\frac{1}{\lambda} = \frac{1}{\lambda_{1}} + \frac{1}{\lambda_{2}}[/tex]

where,

λ = wavelength of photon released from 3 to 1 = ?

λ₁ = wavelength of photon released from 3 to 2 = 800 nm

λ₂ = wavelength of photon released from 2 to 1 = 200 nm

Therefore,

[tex]\frac{1}{\lambda} = \frac{1}{800\ nm} + \frac{1}{200\ nm}\\\\\frac{1}{\lambda} = 0.00625 nm^{-1}\\\\\lambda = \frac{1}{0.00625 nm^{-1}}\\\\\lambda = 160 nm[/tex]

Therefore, the correct option is:

D. 160 nm

Answer:

7.64787 kilograms

Explanation:

75 Newton = 7.64787 Kilograms

hope this helps

pls mark brainliest :D

Answer:

Explanation:

sdfgbaewtfhsertfxzdfhaethsdhdsgfhds

Answer:

5.33 km /hr

Explanation:

45 minutes is  3/4   or   .75 hr

4 km / .75 hr = 5 1/3   or  5.33 km/hr

Answer:

stress,depression and anxiety by improving self esteem.