Section 2 of these multiple choice. Once again im just trying to compare my answ
ID: 1479935 • Letter: S
Question
Section 2 of these multiple choice. Once again im just trying to compare my answers to make sure there right.
1.) Which is false regarding momentum?
A.)Momentum is a scalar quantity.
B.) Momentum conservation only applies to entire systems.
C.)Momentum is the product of mass and velocity.
D.) Momentum conservation is a consequence of Newton’s Laws of Motion.
2.) Which has more momentum between a semi truck and a bumble bee?
A.) depends on the specific masses of each.
B.) the bumble bee
C.) the semi truck
D.) not enough information to tell
3.) Strictly speaking, “revolutions per minute” (or “rpm’s”) are a direct measure of what/
A.) frequency
B.) angular frequency
C.) period
D.) speed
4.) A 1 kg ball is dropped from a height of 2 m above a relaxed spring with spring constant of unknown spring constant. The spring compresses and then expands rapidly, launching the ball upwards. How high does the ball reach before it stops and begins to fall again?
A.) 0 m
B.) 4 m
C.) 2 m
D.) not enough information to tell.
5.) Which of the following is incapable of playing the role of a centripetal force?
A.) weight
B.) normal forces
C.) spring forces
D.) all can be centripetal forces given the right system.
Explanation / Answer
1.) option A
momentum is a vector quantity because it have both magnitude and direction mv where v is velocity and it is vector.
2.)option D
To calculate momentum we need mass as well as velocity of body
3.)B.) angular frequency
it provide us number of revolution in unit time.
4.) D.) not enough information to tell.
force of spring = -Kx { K is spring constant, as we dont know any of the quantity so we can not find out force exerted by spring on ball}
5.)D.) all can be centripetal forces given the right system.
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