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3 years ago

A book weighing 2.0 Newtons is lifted 3.0 meters in 4.0 seconds. How much work was done? SHOW WORK

Physics

1 answer:

qaws [65]3 years ago

7 0

6 Ns is the work done on the book to lift it by 3 m.

Answer:

Explanation:

Work done is the measure of amount of force required to move an object from its initial position to any desired position. So mathematically it can be calculated as the product of force acting on that object to the displacement of that object. Thus, work done on any object or by any object is directly proportional to the force acting on that object and the displacement of that object.

Work done = Force × displacement

As here the force is said to be 2 N and the displacement of the book is said to be 3 m, the work done on the book is

Work done = 2×3 = 6 N.s.

The time has no role to do on the work done calculation to be performed on the object.

Thus, 6 Ns is the work done on the book to lift it by 3 m.

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Answer

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Answer

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3 years ago

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3 years ago

An average man is 80 k (800 N) and the area of the shoes he is wearing is 0.0092 m2. What is the pressure he is exerting on the

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Answer:

P = 86956.52 Pa

Explanation:

Data:

F = 800 N
A = 0.0092 m²
P = ?

Use the formula:

$\boxed{\bold{P=\frac{F}{A}}}$

Replace and solve:

$\boxed{\bold{P=\frac{800\ N}{0.0092\ m^{2}}}}$

$\boxed{\bold{P=86956.52\ Pa}}}$

The pressure it exerts on the ground is 86956.52 Pascal.

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3 years ago

The density of a substance is its mass per unit volume.

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Answers:

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Explanation:

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$D=\frac{m}{V}$

This means density is inversely proportional to volume.

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