Final Science

What is the impulse on an 8-kg ball rolling at 2 m/s when it bumps into a pillow and stops?

-16 kg m/s

Two 1-kg balls move away from each other: one travels 5 m/s to the right, the other 5 m/s to the left. What is the total momentum this system?

0

What is the velocity of the larger fish immediately after lunch?

0.83 m/s

An object has the mass of 10 kg on Earth. What would be the mass of this object at the surface of this planet?

10 kg

What is the momentum on an 8-kg ball rolling at 2 m/s?

16 kg m/s

What would be the value of the gravitational acceleration at the surface of this planet?

19.6 m/s2

An object has the mass of 10 kg on Earth. What would be the weight of this object at the surface of this planet?

196 N

[Problems #8 - #9] Imagine there is another planet which has the same mass as Earth (ME=5.97e24 kg), but its size (or its radius) is twice greater than Earth (2RE). Answer the questions below about this planet. Estimate the acceleration due to the gravity of this planet at its surface. Choose the closest value.

2.5 m/s2

What is the total momentum of the system of two fish before the lunch?

5 kg m/s

[Questions #7-#10] Consider a fish that swims toward and swallows a smaller fish at rest as shown in the figure here. The larger fish has a mass of 5 kg and swims 1 m/s toward a 1-kg fish before lunch.

5 kg m/s

* The radius of the ramp is 60 m. Find the acceleration of this car.

5.4 m/s2

An object has the mass of 20 kg on Earth. What would be the weight of this object at the surface of this planet? Choose the closest value.

50 N

Two 100-kg cars drive east: the first moves at 20 m/s, the second at 40 m/s. What is the total momentum this system?

6000 kg m/s

* The car has the mass of 1250 kg. What is the force which the car needs to stay on the ramp?

6750 N

* [Problems #3 - #5] On a highway ramp, a car is turning around with a constant speed of 18 m/s. What does the car need for this circular motion?

Centripetal Force

[Problems #3 - #7] Imagine there is a planet which has the mass of twice more massive (2ME ) than the mass of Earth (ME=5.97e24 kg), but its shape and size (i.e. radius) is the same as Earth. Answer the questions below about this planet. Which statement below is correct about this planet?

Everything on the planet will fall twice faster than on Earth.

What supplies the centripetal force that keeps the planets in their orbits?

Gravitational Force

Chapter 3, MUTIPLE CHOICE, #9, page 76 in Shipman Which is true about the acceleration due to gravity?

It decrease with increasing altitude.

Chapter 3, MULTIPLE CHOICE, #10, page 76 in Shipman What is true about the constant G?

It is a very small constant.

() Which law of physics can explain your answer to the previous problem?

Newton's First Law of Motion - Law of Inertia

() [Problems #1 -#2] The string that holds a whirling can in its circular path breaks. What kind of force causes it to move in a straight-line path after the break?

No Force

MULTIPLE CHOICE #14, page 73 in Shipman A change in linear momentum requires which of following?

all of these : an acceleration a change in velocity an unbalanced force

FILL IN THE BLANK #13, page 73 in Shipman. [Note: The book has a wrong answer for this problem!] The total linear momentum is not conserved if there is a(n) force acting on the system.

external

Which quantities below of a solid object on this planet are NOT the same as on Earth? Choose all possible answers.

Acceleration when it falls vertically. Weight

Which statement is NOT correct about Einstein's theory of Gravity when it is compared to Newton's theory of Gravity?

According to Einstein's theory, gravitational force could be repulsive as well as attractive, which Newton's theory has only attractive gravitational force.

Find the statement which is NOT correct about Gravity.

According to Newton's theory of Gravity, the strength of gravitational force depends directly on the weight of objects.

What do we call the gravitational force between the Earth and your body?

Weight