3 years ago

In a closed system that has 85 J of mechanical energy, the gravitational

2 answers:

7 0

Answer:

C- it decrease from 85 J to 76 J because it has 85 J mechanical energy. The pulley decreases from 12 J to 9 J which means it lowers by 12. And it lowers by 3.

Explanation:

That's the answer.

Yuliya22 [10]3 years ago

7 0

Answer:

D. It increases from 73 to 76.

Explanation:

Ap3x 2020.

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2 years ago

A spring has a spring constant of 20 N/m. How much potential energy is stored in the spring as it stretched 0.20 m

makkiz [27]

The elastic potential energy (Ep) is given by $Ep = \frac{1}{2}*k*x^2$

Data:
Ep = ? (Joule)
k = 20 N/m
x (displacement) = 0.20 m

Solving:
$Ep = \frac{1}{2}*k*x^2$
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2 years ago

A rowboat has a momentum of 241.5 kg*m/s. if the rowboat has a mass of 115kg, what its it's speed?

Lera25 [3.4K]

Momentum = mass*velocity(or speed)

241.5 kg*m/s = 115 kg * v
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2 years ago

Am arrow of mass 1000kg is shot into a wooden block of mass 5000lg lying at rest in a smooth surface.If the arrow travels 15m/s

Ber [7]

Answer:

Vf=3

Explanation:

you must first write your data

data before impact

M1=1000 M2=5000

V1=0 m/s V2 =0m/s

data after impact

M1=1000 M2=5000

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M1V1 +M2V2=M1V1 +M2V2f

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0=15000+5000Vf

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2 years ago

Why does a 10 gram piece if copper take up more space than a 10 gram piece of gold

algol [13]

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because the mass of the copper is higher than the mass of the gold.

Explanation:

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3 years ago