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3 years ago

2 rocks of different masses roll down a hill at the same speed which rock has more kinetic energy small one or big one ???

Physics

2 answers:

gregori [183]3 years ago

7 0

The big rock will be exhibiting more kinetic energy.

Explanation:

The kinetic energy is calculated for an object with the formula of ½ mv2. Here m is the mass of the object and v is the velocity or speed of the object.

As it is known that the speed of two rocks with different masses are same so the kinetic energy will be completely depending on the mass of the object.

So the rock with higher mass will be having more kinetic energy compared to the smaller rock as its mass will be less.

So the bigger stone will be exhibiting more kinetic energy than the small one.

Sophie [7]3 years ago

5 0

Kinetic energy depends on the mass and the speed of a moving object.

If the speeds are equal, then the rick with more mass has more kinetic energy.

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A machine can never be 100% efficient because some work is always lost due to what?

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4 years ago

Read 2 more answers

A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.0 s after being hit. Then 2.5 s afte

vaieri [72.5K]

Answer:

Part a)

$H = 44.1 m$

Part b)

$y = 13.48 m$

Part c)

$d = 8.86 m$

Explanation:

Part a)

As we know that ball will reach at maximum height at

t = 3 s

now we will have

$t = \frac{v sin\theta}{g}$

now we have

$3 = \frac{vsin\theta}{9.8}$

$v sin\theta = 29.4 m/s$

Now maximum height above ground is given as

$H = \frac{v^2sin^2\theta}{2g}$

$H = \frac{29.4^2}{2(9.8)}$

$H = 44.1 m$

Part b)

Height of the fence is given as

$y = (vsin\theta) t - \frac{1}{2}gt^2$

$y = (29.4)(5.5) - \frac{1}{2}(9.8)(5.5^2)$

$y = 13.48 m$

Part c)

As we know that its horizontal distance moved by the ball in 5.5 s is given as

$x = v_x t$

$97.5 = v_x (5.5)$

$v_x = 17.72 m/s$

now total time of flight is given as

$T = 3 + 3 = 6 s$

so range is given as

$R = v_x T$

$R = (17.72)(6)$

$R = 106.4 m$

so the distance from the fence is given as

$d = 106.4 - 97.5$

$d = 8.86 m$

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