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spin [16.1K]
3 years ago
8

an object with a mass of 70kilograms is supported at a height 8meters above the ground. what's the potential energy of the objec

t with respect to the ground ?(a)560J(b)2,058J(c)5,488J(d)3,430J
Physics
1 answer:
ra1l [238]3 years ago
3 0
Gravitational Potential Energy = mgh (m=mass; g=gravitational force(9.8N/kg); h = height)

Ug = (70kg)(9.8N/kg)(8m) = 5488J which is C.)
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The joule (J) is a unit of energy. Recall that energy may be converted between many different forms such as mechanical energy, t
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Complete Question

The complete question is shown on the first uploaded image

Answer:

The workdone is  W = -177.275J

Explanation:

From the question we are told that

      The initial Volume is  Vi = 0.160 L

      The final volume is  V_f = 0.510L

      The external pressure is  P = 5.00 \ atm

Generally the change in volume is

           \Delta V = V_f - V_i

Substituting values we have

           \Delta V = 0.510 -0.160

                 = 0.350L

Generally workdone is mathematically represented as

           W = -P \Delta V

W is negative because the working is done on the environment by the system which is indicated by volume increase

     Substituting values

                W = - 5* 0.350

                    = -1.75 \ L \ \cdot atm

Now  1 \  L \cdot atm = 101.3J

  Therefore  W = -1.75* 101.3

                          = -177.275J

   

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2 years ago
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A typical jet airliner has a cruise airspeed of 900 km/h , which is its speed relative to the air through which it is flying. If
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Explanation:

It is given that,

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(B) Let v'_{PG} is the speed of the airliner relative to the ground if the airplane is flying from east to west,

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Hence, this is the required solution.                                            

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Why does a third class lever cannot magnify force?​
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Explanation:

The third class lever cannot magnify our force because in third class lever the effort it between the load and the fulcrum. Also, in this type of lever no matter where the force is applied, it is always greater than the force of load. Hence, That type of lever cannot magnify our force.

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2 years ago
Which statement about the physical properties of matter is true?
lisov135 [29]

I believe your answer would be D- Physical properties of matter effect the chemical properties of matter.

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A traffic accident detective measures the skid marks left by a car, 825kg. He determines that the distance between the point tha
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Doing a force balance on the car:
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