2 years ago

2. How much energy does a 5 kg tennis ball have that is sitting on a shelf that is 2m high?

Physics

1 answer:

bixtya [17]2 years ago

5 0

Answer:

GPE= h a m

GPE= (2)(9.8)(5)

GPE=98 J

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3 years ago

If forces acting on an object are unbalanced, which factor may result from an unbalanced force? The net force is negative. There

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2 years ago

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Two small objects each with a net charge of +Q exert a force of magnitude F on each other. We replace one of the objects with an

Alona [7]

Answer:

F'= 4F/9

Explanation:

Two small objects each with a net charge of +Q exert a force of magnitude F on each other. If r is the distance between them, then the force is given by :

$F=\dfrac{kQ^2}{r^2}$ ...(1)

Now, if one of the objects with another whose net charge is + 4Q is replaced and also the distance between +Q and +4Q charges is increased 3 times as far apart as they were. New force is given by :

$F'=\dfrac{kQ\times 4Q}{(3r)^2}\\\\F'=\dfrac{4kQ^2}{9r^2}$ .....(2)

Dividing equation (1) and (2), we get :

$\dfrac{F}{F'}=\dfrac{\dfrac{kQ^2}{r^2}}{\dfrac{4kQ^2}{9r^2}}\\\\\dfrac{F}{F'}=\dfrac{kQ^2}{r^2}\times \dfrac{9r^2}{4kQ^2}\\\\\dfrac{F}{F'}=\dfrac{9}{4}\\\\F'=\dfrac{4F}{9}$

Hence, the correct option is (d) i.e. " 4F/9"

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3 years ago

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velikii [3]

Answer:

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2 years ago

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kolbaska11 [484]

Answer: 2.2x10^4

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So V2=3V1 and p2 = p1 / 3^1.67 = 2.2x10^4 Pa

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3 years ago