PHY094

Which one of the following statements concerning momentum is true?

Jennifer is walking at 1.22 m/s. If Jennifer weighs 552 N, what is the magnitude of her momentum?

Complete the following statement: The angular measure 1.0 radian is equal to

A fan rotating with an initial angular velocity of 1000 rev/min is switched off. In 2 seconds, the angular velocity decreases to 200 rev/min. Assuming the angular acceleration is constant, how many revolutions does the blade undergo during this time?

. Two points are located on a rigid wheel that is rotating with decreasing angular velocity about a fixed axis. Point A is located on the rim of the wheel and point B is halfway between the rim and the axis. Which one of the following statements concerning this situation is true?

A.Both points have the same centripetal acceleration.

B.Both points have the same tangential acceleration.

C.The angular velocity at point A is greater than that of point B.

D.Both points have the same instantaneous angular velocity

A top is spinning counterclockwise as shown in the figure. It is also moving to the right with a linear speed v. What is the direction of the angular velocity?

A.upward

B.downward

C.left

D.right

A wrench is used to tighten a nut as shown in the figure. A 12-N force is applied 7.0 cm from the axis of rotation. What is the magnitude of the torque due to the applied force?

A.0.58 N.m

B.0.84 N.m

C.1.71 N.m

D.14 N.m

A string is tied to a doorknob 0.72 m from the hinge as illustrated in the figure. At the instant shown, the force applied to the string is 5.0 N. What is the magnitude of the torque on the door?

A string is wrapped around a pulley of radius 0.05 m and moment of inertia 0.2 kg  m2. If the string is pulled with a force , the resulting angular acceleration of the pulley is 2 rad/s2. Determine the magnitude of the force .

A.0.4 N

B.2 N

C.8 N

D.16 N

Two uniform solid spheres, A and B have the same mass. The radius of sphere B is twice that of sphere A. The axis of rotation passes through each sphere. Which one of the following statements concerning the moments of inertia of these spheres is true?

When a force of 19 N is applied to a spring, it elongates 0.085 m. Determine the period of oscillation of a 4.0-kg object suspended from this spring.

The position of a simple harmonic oscillator is given by figure below where t is in seconds. What is the maximum velocity of this oscillator?

A.0.17 m/s

B.0.52 m/s

C.0.67 m/s

D.1.0 m/s

During an evening news broadcast in Helsinki, Finland, the meteorologist indicated that the day's lowest temperature was –6.0 °C. What is the corresponding value of this temperature on the Fahrenheit scale?

The coefficient of linear expansion of a certain solid is 11 × 10–6/C°. Assuming this solid behaves like most solids, what is its coefficient of volume expansion?

The specific heat capacity of iron is approximately half that of aluminum. Two balls of equal mass, one made of iron and the other of aluminum, both at 90 °C, are dropped into a thermally insulated jar that contains an equal mass of water at 25 °C. Thermal equilibrium is eventually reached. Which one of the following statements concerning the final temperatures is true?

At what rate is heat lost through a 1.5 m × 3.0 m rectangular glass windowpane that is 0.4 cm thick when the inside temperature is 22 °C and the outside temperature is 6.0 °C? The thermal conductivity for the glass is 0.75 W/(m · C°)

What is the period of a pendulum consisting of a 6-kg object oscillating on a 4-m string?

The figures show standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. Note: some of the figures show situations that are not possible.

A.1 and 4

B.2 and 3

C.4 and 5

D.5 and 6

Which one of the pipes emits sound with the highest frequency?

A.1

B.2

C.3

D.4

When the gas enclosed beneath the piston shown in the figure receives 2170 J of heat, Q, from its surroundings, it performs 2840 J of work in raising the piston. What is the change in the internal energy of the gas?

A.+670 J

B.-670 J

C.-5010 J

D.+5010 J

A wave has a frequency of 58 Hz and a speed of 31 m/s. What is the wavelength of this wave?