Unit 7

Question 1

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

Answer 1

10m/s is the velocity

U7/C1 pg. 2

Question 2

The kinetic energy of an object increases as its ______ increases.

Answer 2

velocity

U7/C1 pg. 2

Question 3

The rate at which work is done is ____.

Answer 3

power

U7/C4 pg. 27

Question 4

Examples that show the same type of thermal energy transfer?

Answer 4

iron on ironing board
pan on stove
U7/C3 pg. 24

Question 5

How much force is required to lift a rock a vertical distance of 8 m if 80 J of work were done?

Answer 5

10 N

U7/C1 pg. 3

Question 6

Amount of heat needed to raise the temperature of 1 kg of a material by 1 oC.____

Answer 6

Specific heat

U7/C3 pg. 25

Question 7

When you hold an ice cube, your hand feels cold because

Answer 7

heat flows from your hand to the ice cube.

U7/C3 pg. 24

Question 8

Temperature measures the average ____ of the particles in a material.

Answer 8

kinetic energy

U7/C1 pg. 2

Question 9

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

Answer 9

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

U7/C1 pg. 3

Question 10

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

Answer 10

increases

U7/C1 pg. 3

Question 11

The diagram to the right shows four locations in a temperature field. The temperature of each location is given in degrees Celsius. Heat energy will normally flow from:

Answer 11

High temp to low temp

Ex. 35C to 29C

Question 12

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

Answer 12

remains constant

U7/C3 pg. 24

Question 13

Bob used a force of 10 N to pull a 50 kg trunk a distance of 5 m in 2 seconds. Bob’s power is

Answer 13

25 W

U7/C4 pg. 26