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3 years ago

What can alter the motion of an object

Physics

1 answer:

Liula [17]3 years ago

3 0

Force can alter its direction,slow or stop it you could say it can change its velocity

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You've recently read about a chemical laser that generates a 20.0-cm-diameter, 22.0 MW laser beam. One day, after physics class,

Setler [38]

Answer:

0.3847 m/s

Explanation:

$I$ = Intensity = $\dfrac{P}{A}=\dfrac{P}{\pi r^2}$

d = Diameter = 20 cm

r = Radius = $\dfrac{d}{2}=\dfrac{20}{2}=10\ cm$

c = Speed of light = $3\times 10^8\ m/s$

s = Distance = 100 m

P = Power = 22 MW

Pressure due to the laser is given by

$P_r=\dfrac{I}{c}\\\Rightarrow P_r=\dfrac{P}{Ac}\\\Rightarrow P_r=\dfrac{P}{\pi r^2c}\\\Rightarrow P_r=\dfrac{22\times 10^{6}}{\pi 0.1^2\times 3\times 10^8}\\\Rightarrow P_r=2.33427\ N/m^2$

Force is given by

$F=P_rA\\\Rightarrow F=2.33427\times \pi 0.1^2\\\Rightarrow F=0.07333\ N$

Acceleration is given by

$a=\dfrac{F}{m}\\\Rightarrow a=\dfrac{0.07333}{99}\\\Rightarrow a=0.00074\ m/s^2$

Speed of the block would be

$v=\sqrt{2as}\\\Rightarrow v=\sqrt{2\times 0.00074\times 100}\\\Rightarrow v=0.3847\ m/s$

The speed of the block is 0.3847 m/s

5 0

3 years ago

States of matter depend in part on the___<br> of an item.

harina [27]

Answer:

Explanation:

Matter occurs in four states: solids, liquids, gases, and plasma.

States of matter are generally described on the basis of qualities that can be seen or felt.

A solid has a definite shape and volume because the molecules that make up the solid are packed closely together and move slowly.

7 0

3 years ago

How can a rocket be propelled forward in space where there is no air to push<br> against?

pychu [463]

Answer:

Explanation:

In space, rockets zoom around with no air to push against. ... When a rocket shoots fuel out one end, this propels the rocket forward — no air is required. NASA says this principle is easy to observe on Earth. If you stand on a skateboard and throw a bowling ball forward, that force will push you and the skateboard back.

3 0

3 years ago

The balloon's behavior results from a change at the electron level. What do you think might have happened while rubbing the ball

Mariulka [41]

Answer:

Explanation:

opposite charges attract each other, while rubbing the objects together they developed opposite charges which caused them to drift together

6 0

4 years ago

If a car is moving 7.0m/s and has 62J of energy, how much mass does it have ?

Ede4ka [16]

Answi am sorry but i do not know the answer

Explanation:

7 0

2 years ago