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2 years ago

A 45 kg object has a momentum of 225 kg-m/s northward. What is the object's velocity?

Physics

1 answer:

melomori [17]2 years ago

3 0

Answer: 5 m/s North

Explanation:

Velocity = Momentum/Mass

Velocity = 225 kg*m/s/45kg

Velocity = 5 m/s North

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The answer is A) for sure

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3 years ago

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A rifle with a mass of 0.9 kg fires a bullet with a mass of 6.0 g (0.006 kg). The bullet moves with a muzzle velocity of 750 m/s

SCORPION-xisa [38]

Answer:

a ) 4.5 N.s

b) V =5 m/s

Explanation:

given,

mass of rifle(M) = 0.9 kg

mass of bullet(m) = 6 g = 0.006 kg

velocity of the bullet(v) = 750 m/s

a) momentum of bullet = m × v

= 750 × 0.006

= 4.5 N.s

b) recoil velocity

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V =5 m/s

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3 years ago

there are two types of waves: electromagnetic and mechanical. can either type travel regardless of the presence of a medium?

Dmitry_Shevchenko [17]

Yes, electromagnetic can travel without medium.

Mechanical waves and electromagnetic waves are two important ways that energy is transported in the world around us.

Waves in water and sound waves in air are two examples of mechanical waves.

Mechanical waves are caused by a disturbance or vibration in matter, whether solid, gas, liquid, or plasma.

Matter that waves are traveling through is called a medium.

These mechanical waves travel through a medium by causing the molecules to bump into each other, like falling dominoes transferring energy from one to the next.

Sound waves cannot travel in the vacuum of space because there is no medium to transmit these mechanical waves.

On the other hand electromagnetic waves don't require medium for its propagation.

An easy example would be light which is an EM wave reaches earth even though space has no medium.

Learn more about different types of waves here:

brainly.com/question/13364787

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2 years ago

Which statement about dwarf planets is true?

sineoko [7]

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3 years ago

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You are working out on a rowing machine. Each time you pull the rowing bar (which simulates the oars) toward you, it moves a dis

tangare [24]

Answer:

56.86153 N

Explanation:

t =Time taken

F = Force

Power

$P=\frac{W}{t}\\\Rightarrow W=P\times t\\\Rightarrow W=77\times 0.96\\\Rightarrow W=73.92\ Joules$