3 years ago

The ability to do work or cause change is called

Physics

1 answer:

ipn [44]3 years ago

3 0

Answer:

Energy

Explanation:

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Volume of an block is 5 cm3. If the density of the block is 250 g/cm3, what is the mass of the block ?

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1.25kg

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Simply multiply volume and density together

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3 years ago

Complete this sentence. Average speed is worked out from dividing _________ by ________

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Average speed is worked out from dividing distance by time.

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3 years ago

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PLS HEP WILL GIVE BRAINLIEST TO FIRST ANSWER SCIENCEE!!

MAVERICK [17]

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Claim: The heart pumps more blood throughout the body when one exercises because exercise takes a lot of energy from the body.

Evidence: Heart rate went from 80 bpm to 120 bpm

Reasoning: Doing exercise takes a lot of energy to do, causing the circulatory system to have to work harder and pump more blood throughout the body in order to allow someone to be able to do a task that involves so much movement and energy.

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2 years ago

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3 years ago

A 12.0-g bullet is fi red horizontally into a 100-g wooden block initially at rest on a horizontal surface. After impact, the bl

allochka39001 [22]

Answer:

$v_1 = 91.3 m/s$

Explanation:

By energy conservation and work energy theorem we can say that after bullet hits the block, it will move on the rough floor and comes to rest

so here work done by frictional force = change in kinetic energy

so we know that

$W_f = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2$

$-\mu mg d = \frac{1}{2}m(v_f^2 - v_i^2)$

$-0.650(9.81)(7.5) = \frac{1}{2}(0 - v_i^2)$

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now by momentum conservation we have

$m_1 v_1 = (m_1 + m_2) v$

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$v_1 = 91.3 m/s$

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3 years ago