Test - Energy

Question 1

42. What is the potential energy of a puppy who weighs 18 N sitting in a high chair 2 m high?

Answer 1

GPE=?
F=18N
H=2.5 M
A=9.8 M/S^2

F=MA
F/A=M
18/9.8=M
1.84 kg

GPE=HAM
GPE= (1.84)(2)(9.8)
GPE= 36.06 J

Answer: 36.06 J

Question 2

44. An 8 kg toddler is running and using 400 J of kinetic energy. What is the velocity of the child?

Answer 2

V=10 m/s FORWARD Velocity has speed and direction

Notes

Question 3

What is an example of thermal energy transfer by convection?

Answer 3

kettle heating up on a stove

Question 4

The picture shows a person swinging a baseball bat, starting at point A in which the bat high to the back. The kinetic energy of the bat would be greatest at…

Answer 4

Mid- swing and low

Question 5

A medicine ball has 10 J of energy and is thrown upward with a velocity of 2 m/s. What’s it’s mass?

Answer 5

5 kg

Question 6

When oil is burned to produce electricity, the electrical energy produced is less than the potential energy in the oil. Which best explains observation?

Answer 6

Some of the potential energy in oil is converted into forms of energy other than electricity

Question 7

The mechanical energy of a coconut falling from a tree ____?

Answer 7

Remains constant

Question 8

When an object absorbs energy, the change in temperature will be…

Answer 8

Positive

Question 9

As the time required to do a given amount of work decreases, the power developed…

Answer 9

Increases

Question 10

Through which of the following will convection most likely occur?

Answer 10

Liquids and gases

Question 11

Give two examples of the same type of thermal energy transfer which is conduction?

Answer 11

pan on stove and iron on ironing board