3 years ago

Two books with different masses fall off the same bookshelf. As they fall,which has more kinetic energy and why

1 answer:

Alex3 years ago

5 0

Kinetic energy E = m * v^2

<span>Since the acceleration of both books will be -neglecting air resistance - the same, the kinetic energy will be directly proportional to the mass of the book.</span>

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Answer:

1) No, the car does not travel at constant speed.

2) V = 9 ft/s

3) No, the car does not travel at constant speed.

4) V = 5.9 ft/s

Explanation:

In order to know if the car is traveling at constant speed we need to derive the given formula. That way we get speed as a function of time:

V(t) = 2*t + 2 Since the speed depends on time, the speed is not constant at any time.

For the average speed we evaluate the formula for t=2 and t=5:

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$V_{1.8-2.1}=\frac{d(2.1)-d(1.8)}{2.1-1.8}=5.9 ft/s$

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Which statement correctly explains mechanical advantage?

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I'm not entirely sure but I would think it's A.

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An iron sphere of radius 0.18m has mass 190 kg. Calculate the density of the iron

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radius=r=0.18m

Volume:-

$\\ \sf\rightarrowtail \dfrac{4}{3}\pi r^3$

$\\ \sf\rightarrowtail \dfrac{4}{3}\pi (0.18)^3$

$\\ \sf\rightarrowtail \dfrac{4}{3}\pi (0.005832)$

$\\ \sf\rightarrowtail 0.024m^3$

Mass=190kg

Density:-

$\\ \sf\rightarrowtail \dfrac{Mass}{Volume}$

$\\ \sf\rightarrowtail \dfrac{190}{0.024}$

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