Question

Question 11 (5 points)

The Ptolemaic model of the universe describes the Earth as
Question 11 options:


A)
at the center, but moving relative to the other planets.


B)
orbiting around the sun with the other planets of our solar system.


C)
at the center, stationary, with planets that rotate around it.


D)
orbiting the moon, following the path of the sun.
Question 12 (5 points)

Kepler modified Copernicus's model of the universe by proposing that the
Question 12 options:


A)
planets follow an elliptical orbit every leap year.


B)
planets have their own orbits around themselves as they orbit the sun.


C)
planets follow a circular orbit around the sun.


D)
paths of the planets follow an elliptical orbit around the sun.
Question 13 (5 points)

Within the metric system, all units are based on the number
Question 13 options:


A)
1.


B)
100.


C)
1,000.


D)
10.
Question 14 (5 points)

A car with two people traveling down the road has a mass of 100 kg and a velocity of 5 m/s. The car pulls over and picks up two people. The mass of the car is now 150 kg. What's the new momentum if the velocity stays the same?
Question 14 options:


A)
250 kg-m/s


B)
750 kg-m/s


C)
1,250 kg-m/s


D)
500 kg-m/s
Question 15 (5 points)

What's the velocity of an object that has a momentum of 4,000 kg-m/s and a mass of 115 kg? Round to the nearest hundredth.
Question 15 options:


A)
35.67 m/s


B)
36.5 m/s


C)
34.78 m/s


D)
37.43 m/s
Question 16 (5 points)

What's the velocity of a skateboarder whose momentum is 100 kg-m/s and mass is 15 kg? Round to the nearest hundredth.
Question 16 options:


A)
13.25 m/s


B)
3.33 m/s


C)
6.67 kg


D)
6.67 m/s
Question 17 (5 points)

An object with a mass of 120 kilograms is moving at a velocity of 60 m/s. What's its momentum?
Question 17 options:


A)
3,600 kg-m/s


B)
7,200 kg-m/s


C)
2 kg-m/s


D)
0.5 kg-m/s
Question 18 (5 points)

An object has a mass of 13.5 kilograms. What force is required to accelerate it to a rate of 9.5 m/s2?
Question 18 options:


A)
81.00 N


B)
132.30 N


C)
173.75 N


D)
128.25 N
Question 19 (5 points)

When a person spins a bucket of water in a circle, the force acting on the bucket to keep the water inside is called
Question 19 options:


A)
mass.


B)
acceleration.


C)
gravity.


D)
centripetal force.
Question 20 (5 points)

A person with a mass of 15 kg is walking uphill at a velocity of 2 m/s. What's the walker's momentum?
Question 20 options:


A)
10 kg-m/s


B)
30 kg-m/s


C)
15 kg-m/s


D)
13 kg-m/s

Answer 1

Q11: C

Q12: D

Q13: D

Q14: B
- p = m v = 150 kg × 5 m/s = 750 kg·m/s

Q15: C
- v = p/m = 4000 / 115 = 34.78 m/s

Q16: D
- v = p/m = 100 / 15 = 6.67 m/s

Q17: B
- p = m v = 120 × 60 = 7200 kg·m/s

Q18: D
- F = m a = 13.5 × 9.5 = 128.25 N

Q19: D

Q20: B
- p = m v = 15 × 2 = 30 kg·m/s