PHYSICS HIGH SCHOOL

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa
B. 73.5 Pa
C. 226.5 Pa
D. 122.5 Pa

Answers

Answer 1
Answer: Pressure is defined as the force per unit area. This measurement is more convenient to use for describing a force exerted. The standard unit for pressure is Pascal. For this problem, force is the gravitational pull from the block. Calculations are as follows:

P = F/A where F = mg

F = 7.5 ( 9.81) = 73.6 N

P = 73.6 N / 0.6 m^2 = 122.5 Pa

Thus, the answer is D.
Answer 2
Answer:

Yeh its D.

ddddddddddddddddddd for the win

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A 5,400 W motor is used to do work. If the motor is used for 640 s, about how much work could it do?

Answers

Work is defined as the conversion of energy. The given motor can give 3456000 J of work.

Power:

It is defined as the ability of a machine to do work or as the time rate of energy conversion.  

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Where,

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To know more about work,

 brainly.com/question/6655783

Since P=E/t,
where P=power (W),
E=energy (J) and
t=time (s).

Just rearrange this formula to obtain E=P*t=5400*640=3456000 J.

Energy and work are very related since energy is defined like the ability of doing work. Actually work is also measured in J so the answer is the one above.
Work = 3456000 J

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Answers

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Explanation:

I got it right

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Answers

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Answers

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