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CaHeK987 [17]
3 years ago
9

A man pushes on a trunk with a force of 250 newtons. The trunk does not move. How much positive work is done on the trunk?

Physics
1 answer:
Digiron [165]3 years ago
3 0

Answer:

F is 250 N

d is 0 m

F x d

=250 x 0

=0

The answer is 0.0 J.

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d = 0.8 m
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The weight of a body is 147N. what is its mass?
barxatty [35]

<u>To find the mass, with only the weight</u>:

  ⇒ must consider the relationship between the mass and weight

     ⇒ (<em>in other words</em>) we must find the equation that has both the

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<u>Based on our physics knowledge, we know</u>:

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<u>Now let's plug in the values, and solve</u>:

 147N = mass*9.8_.m/s^2\\mass = 15_.kg

<u>Answer: 15 kg</u>

Hope that helps!

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Upon impact, bicycle helmets compress, thus lowering the potentially dangerous acceleration experienced by the head. A new kind
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Answer:

acceleration = -15.3g

Explanation:

given data

speed = 6.00 m/s.

thickness = 12

moves the entire = 12.0 cm

solution

we will use here equation that is

v² - u²  = 2 × a × s    ........................1

here v = 0 is the final velocity and u = 6.0 m/s is initial velocity and s= 0.12 m is the distance covered and a is the acceleration

so we put here value and get acceleration

a = \frac{v^2-u^2}{2s}

a = \frac{0^2-6^2}{2\times 0.12}

a = -150 m/s² ( negative sign means it is a deceleration )

and

acceleration in units of g  

a = \frac{-150}{9.8}

a = -15.3 g

6 0
3 years ago
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