3 years ago

a cinder block is sitting on a platform 20 m high. it weighs 7.9 the block has potential energy. calculate it.

Physics

1 answer:

Anna71 [15]3 years ago

8 0

I assume that 7.9 is 7.9 newton .I think the answer is the correct answer

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What is the mass number, symbol, and charge of an ion that contains 35 protons, 45 neutrons and 36 electrons?

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3 years ago

A 3kg box is pulled along the floor with a force of P=20 N at an angle of 30 degrees. If the box is moving at a constant velocit

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If force is applied at 30 degree with the horizontal

then first we will find the components of force in two directions

$F_x = 20 cos20$

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now we can find normal force by balancing the forces in Y direction

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$W = 3*10 = 30 N$

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3 years ago

Which of the following is an example of rotation? A. The moon Titan orbiting the planet Saturn B. The planet Saturn orbiting the

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3 years ago

A particle moves with constant acceleration along a straight line starting from rest. The percentage increase in its displacemen

soldi70 [24.7K]

Answer:

Option 2 is the correct answer.

Explanation:

We have equation of motion s = ut + 0.5at²

Here u = 0 m/s

So, s = 0.5at²

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Distance traveled in second second = 0.5 x a x 2² - 0.5 x a x 1²= 1.5 a

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Distance traveled in fourth second = 0.5 x a x 4² - 0.5 x a x 3²= 3.5 a

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Option 2 is the correct answer.

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4 years ago