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Physics UBQ

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Intermediate
Conceptual
MCQ

The graph above shows velocity as a function of time for an object moving along a straight line. For which of the following sections of the graph is the acceleration constant and nonzero?

Intermediate
Mathematical
GQ

A baseball is tossed from street level by a student straight up at a speed of \(25.3 \text{ m/s}\). After reaching maximum height, it is caught by another student on the roof of a building, \(17.4 \text{ m}\) above the street. How long did this take?

Intermediate
Conceptual
MCQ

An isolated spherical star of radius [katex] R_o [/katex], rotates about an axis that passes through its center with an angular velocity of [katex] \omega_o [/katex]. Gravitational forces within the star cause the star’s radius to collapse and decrease to a value [katex] r_o <R_o [/katex], but the mass of the star remains constant. A graph of the star’s angular velocity as a function of time as it collapses is shown. Which of the following predictions is correct about the angular momentum [katex] L [/katex] of the star immediately after the collapse?

Intermediate
Mathematical
MCQ

A car traveling to the right with a speed v brakes to a stop in a distance d. What is the work done on the car by the frictional force F? (Assume that the frictional force is constant)

Advanced
Mathematical
GQ

A 2,000 kg car collides with a stationary 1,000 kg car. Afterwards, they slide 6 m before coming to a stop. The coefficient of friction between the tires and the road is 0.7. Find the initial velocity of the 2,000 kg car before the collision?

Beginner
Mathematical
MCQ

The block is moving horizontally at a constant velocity. There are two applied forces on the object as shown in the image. In which direction is the friction force acting on the object?

Intermediate
Mathematical
MCQ

A cart starts from rest and accelerates uniformly at 4.0 m/s2 for 5.0 s. It next maintains the velocity it has reached for 10 s. Then it slows down at a steady rate of 2.0 m/s2 for 4.0 s. What is the final speed of the car?

Intermediate
Conceptual
MCQ

A golfer hits her ball in a high arcing shot. Air resistance is negligible. When the ball is at its highest point, which of the following is true?

Beginner
Conceptual
MCQ

The figure shows a graph of the position x of two cars, C and D, as a function of time t. According to this graph, which statements about these cars must be true? (There could be more
than one correct choice.)

Intermediate
Mathematical
FRQ

A 70 kg woman and her 35 kg son are standing at rest on an ice rink, as shown above. They push against each other for a time of 0.60 s, causing them to glide apart. The speed of the woman immediately after they separate is 0.55 m/s.

Assume that during the push, friction is negligible compared with the forces the people exert on each other.

  1. Calculate the initial speed of the son after the push.
  2. Calculate the magnitude of the average force exerted on the son by the mother during the push.
  3. How do the magnitude and direction of the average force exerted on the mother by the son during the push compare with those of the average force exerted on the son by the mother? Justify your answer.
  4. After the initial push, the friction that the ice exerts cannot be considered negligible, and the mother comes to rest after moving a distance of 7.0 m across the ice. If their coefficients of friction are the same, how far does the son move after the push?
Intermediate
Mathematical
MCQ

Above is the graph of the velocity vs. time of a duck flying due south for the winter. At what point might the duck begin reversing directions?

Intermediate
Mathematical
MCQ

A plane, 220 meters high, is dropping a supply crate to an island below. It is traveling with a horizontal velocity of 150 m/s. At what horizontal distance must the plane drop the supply crate for it to land on the island? Use [katex] g = 9.81 \, m/s^2[/katex].

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