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4 years ago

What is motion and how do we determine it

Physics

1 answer:

spin [16.1K]4 years ago

8 0

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A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to

GarryVolchara [31]

Explanation:

It is given that,

Mass of the block, m = 3 kg

Initially, the block is at rest, u = 0

Force acting on the block, P = 12 N

The coefficient of kinetic friction between the block and the surface is, $\mu_k=0.2$

We need to find the rate is the force P doing work on the block at t = 2.0 s. The rate at which work is done is called the power. Let is equal to P'

Frictional force acting on the block, $f=\mu_k mg$

$f=0.2\times 3\ kg\times 9.8\ m/s^2=5.88\ N$

So, the net force acting on the block, F = P - f

$F=12-5.88=6.12\ N$

Let a is the acceleration of the block, $a=\dfrac{F}{m}$

$a=\dfrac{6.12}{3}=2.04\ m/s^2$

Let v is the velocity of the block after 2 seconds. So,

$v=u+at$

$v=0+2.04\times 2$

v = 4.08 m/s

Power, $P'=\dfrac{W}{t}=\dfrac{F.d}{t}=F.v$

$P'=12\ N\times 4.08\ m/s=48.96\ Watts$

So, the force P is doing work on the block at the rate of 48.96 watts.

3 0

3 years ago

Which of these waves probably has the largest wavelength?

elena-14-01-66 [18.8K]

Answer:

I think it's the last one

Explanation:

good luck

5 0

3 years ago

Read 2 more answers

If for a given pair of media CR

nika2105 [10]

CR < CY < CB

<h3>Which factors affect the critical angle for a given pair of media?</h3>

The factors which affect the critical angle are

(a) The colour (or wavelength) of light

(b) The temperature

(i) Effect of colour of light: The critical angle for a pair of media is less for the violet light and more for the red light. Thus the critical angle increases with the increase in wavelength of light.

(ii) Effect of temperature: The critical angle increases with increase in temperature because on increasing temperature of medium, its refractive index decreases.

According to the question,

μ 1 sinCR =1

μ 2 sinCY =1

μ 3 sinCB =1

μ 1 > μ 2 and μ 2 > μ 3

⟹μ 1 > μ 2 > μ 3

CR < CY < CB

Thus,

The critical angle increases with the increase in wavelength of light.

Learn more about wavelength of light here:

brainly.com/question/27557868

#SPJ1

7 0

2 years ago

What is the wavelength of light emitted when the electron in a hydrogen atom moves from the n=5 state to the n=2 state? give you

zubka84 [21]

May be answer is 303 nm

3 0

4 years ago

What is unit of pressure

REY [17]

Answer:

pascal

Explanation:

5 0

3 years ago

Read 2 more answers