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evablogger [386]
3 years ago
8

a .1-kilogram ball rolls across the floor at a speed of 2 meters per second. Another .1 kilogram ball rests on a shelf 1 meter a

bove the floor. Which ball has more energy?
Physics
1 answer:
JulsSmile [24]3 years ago
6 0
First, we need to fight the weight of the balls instead of their mass.  We do this by multiplying their weight it kg by 9.8.  This gives us .98 N.  To find the potential energy of the rolling ball, we find its kinetic energy.  The formula for this is KE=mass*velocity^2*1/2.  

Plugging in our numbers, we have Kinetic energy = .1 * 1^2*1/2 which gives us .05 joules.

Now we find the potential energy of the ball on the shelf.  For this we do:

Potential energy = .1*9.8*1, and our answer is .98 joules.  Clearly, the ball on the shelf has more energy.
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Explanation:

This is my answer.

7 0
2 years ago
Dumbo the elephant weights 13,000 pounds. What force would the Earths surface apply to Dumbo? 2.2 pounds = 1 kg
snow_lady [41]

Answer:

57908 N

Explanation:

Let's first convert Dumbo's mass into kg using the given relationship: 2.2 pounds =1 kg.

Then, 13000 lbs = 13000/2.2 kg = 5909 kg

Now, let's find the force of gravity on Dumbo at the surface of the earth, which would be in magnitude equal to the normal force that the Earth's surface applies on Dumbo.

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8 0
2 years ago
Select all that apply.
GenaCL600 [577]

The correct answer to the question is: A) miles/hour and B) metre/ second.

EXPLANATION:

Before answering this question, first we have to understand speed.

The speed of a body is defined as the rate of distance travelled or the distance travelled by a body per unit time.

Hence, it is a derived quantity which is obtained from distance and time.

The unit of distance can be metre, miles, and the unit of time can be second, minutes or hour.

As speed is the distance covered per unit time, the perfect units will be miles/hour and metre/second.

Hence, the correct options are first and second.

5 0
3 years ago
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Inessa05 [86]
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Change in market price is m<span>ovement along the demand curve. </span>

4 0
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LUCKY_DIMON [66]

Answer:

im not too sure about that all i know is history

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