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2 years ago

13

the ratio of kinetic energy to the potential energy of a certain object of mass m at a height of 40 m above ground level is 2:1.

What is the speed of the object at the point? Use g=10 m/s^2 A.)20 m/s B.)40 m/s C.)30 m/s D.) 10 m/s

1 answer:

lubasha [3.4K]2 years ago

6 0

I believe it is A) 2(1/2mv^2)=mgh <===cross out masses
2(1/2V^2)=gh

Solve for V

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Which statement describes what happens when a balloon is rubbed with a wool cloth?

victus00 [196]

Electrons move from the atoms in the cloth to the atoms in the balloon, causing the balloon to have a negative charge

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2 years ago

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PLZZZZZ ANSWER Which example describes a nonrenewable resource?

Zepler [3.9K]

Answer:

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Talja [164]

Answer:

70.07 Hz

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Since the sound is moving away from the observer then

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$f_s=\frac {343\times 76}{343-v_s}$

Similarly, with $f_o$ of 65 we have

$65 = f_s\times\frac {(343+vs)}{343}\\f_s=\frac {343\times 65}{343+v_s}$

Now

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2 years ago

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Answer:

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Since they all have the same tires, the coefficient of friction between the tire and the floor is the same for each car. Acceleration due to gravity, g, is constant.

The only factor that determines the frictional force of each car is the mass. Hence, the more the mass, the more the frictional force.

So, the most massive car will have the most frictional force and hence, will come to a stop quicker than the others. The least massive car will have the least frictional force and so, will take a longer time to stop.

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2 years ago

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Bas_tet [7]

Answer: The temperature of the water falls by 3.3°C

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