1. The position vector of a particle is directed along the positive y axis. What
ID: 1571781 • Letter: 1
Question
1. The position vector of a particle is directed along the positive y axis. What is the direction of the net force acting on the particle if the net torque is directed along the negative x direction?
a. Posivite z direction
b. Posivite x direction
c. negative x direction
d. negative y direction
e. negative z direction
2. A star is rotating about an axis that passes through its center. When the star “dies,” the balance between the inward pressure due to the force of gravity and the outward pressure from nuclear processes is no longer present and the star collapses inward and its radius decreases with time. Which one of the following choices best describes what happens as the star collapses?
e. The angular velocity of the star decreases.
3. Which one of the following statements concerning a wheel undergoing rolling motion is true?
e. The tangential velocity is the same for all points on the rim of the wheel.
4. The second hand on a clock completes one revolution each minute. What is the direction of the angular momentum of the second hand as it passes the “12” at the top of the clock?
a. The angular momentum of the star decreases.Explanation / Answer
1)
Ans :- positive Z direction
2)
b) :- The angular momentum of the star remains constant.
3)
a) :- There is no slipping at the point where the wheel touches the surface on which it is rolling.
4)
c) :- into the face of the clock
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