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Physics Exam 3 conceptual questions
Terms in this set (44)
Angles are often measured in radians. How many degrees are there in one radian?
The SI unit for angular displacement is the radian. In calculations, what is the effect of using the radian?
Since the radian is a unitless quantity, there is no effect on other units when multiplying or dividing by the radian.
For a given circle, the radian is defined as which one of the following expressions?
the arc length divided by the radius of the circle
The hand on a stopwatch makes one complete revolution every three seconds. Express the angular speed of this hand in radians per second.
Which one of the following is the SI unit for angular velocity?
radians per second (rad/s)
Two points are located on a rigid wheel that is rotating with a 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 is true concerning this situation?
Both points have the same instantaneous angular velocity.
As an object rotates, its angular speed increases with time. Complete the following statement: The total acceleration of the object is given by
the vector sum of the centripetal acceleration and the tangential acceleration.
Which one of the following statements correctly relates the centripetal acceleration and the angular velocity?
The centripetal acceleration is the product of the radius and the square of the angular velocity.
The wheels of a NASCAR racer roll without slipping as the car moves in a circular path at constant speed. Which one of the following quantities has a non-zero value and has a constant value in this situation?
The wheels of a bicycle roll without slipping on a horizontal road. The bicycle is moving due east at a constant velocity. What is the direction of the angular velocity of the wheels?
While putting in a new ceiling, Jake uses a drill to put screws into the drywall. The screws rotate clockwise as they go into the ceiling. What is the direction of the angular velocity of the screw as the drill drives it into the ceiling? Express the direction relative to Jake, who is looking upward at the screw.
Which one of the following choices is produced when a constant net torque is applied to a rigid object?
a change in the angular velocity of the object
A force is applied to a doorknob. This force will be most effective in causing the door to rotate when which of the following is true?
The direction of the force is at an angle of 90 with respect to the door.
A unit of torque is which of the following?
Which one of the following descriptions indicates that the object is in translational equilibrium?
Translational equilibrium occurs if the object is at rest or moving with constant velocity.
Complete the following statement: When determining the net torque on a rigid body, only the torques due to
external forces are considered.
A water skier is pulled by a boat traveling with a constant velocity. Which one of the following statements is falseconcerning this situation?
There is a net horizontal force on the skier in the direction the boat's velocity.
An object, which is considered a rigid body, is not in equilibrium. Which one of the following statements must be true concerning the magnitude of the angular acceleration and translational acceleration a of the object?
Either a>0rad/s2 ora>0m/s2
An object is rolling, so its motion involves both rotation and translation. Which one of the following statements must be true concerning this situation?
The total mechanical energy is equal to the sum of the translational and rotational kinetic energies plus the gravitational potential energy of the object.
A child standing on the edge of a freely spinning merry-go-round moves quickly to the center. Which one of the following statements is necessarily true concerning this event and why?
The angular speed of the system increases because the moment of inertia of the system has decreased.
What happens when a spinning ice skater draws in her outstretched arms?
Her moment of inertia decreases causing her to spin faster
The moment of inertia of a wheel about its axle does not depend on which one of the following properties?
the angular velocity of the wheel as it rotates
A block is hung vertically at the end of a spring. When the block is displaced and released, it moves in simple harmonic motion. Which one of the following statements is true concerning the block?
The maximum acceleration of the block occurs when its velocity is zero.
Which one of the following statements concerning simple harmonic motion is false?
A restoring force acts on an object in simple harmonic motion that is directed in the same direction as the object's displacement.
An object is in simple harmonic motion. The rate at which the object oscillates may be described using the period T, the frequency f, and the angular frequency . If the angular frequency decreases, what is the effect on the period and the frequency?
The period would increase, and the frequency would decrease.
A ball of mass m is attached to the end of a spring that has a spring constant k. When the ball is displaced from its equilibrium position and released, it moves in simple harmonic motion. Consider the relationship between the angular frequency, the mass, and the spring constant given in the text. Which one of the following statements concerning that relationship is true?
Increasing the spring constant causes the angular frequency to increase.
An object in simple harmonic motion is observed to move between a maximum position and a minimum position. The minimum time that elapses between the object being at its maximum position and when it returns to that maximum position is equal to which of the following parameters?
A block is attached to the end of a spring. The block is then displaced from its equilibrium position and released. Subsequently, the block moves back and forth on a frictionless surface without any losses due to friction. Which one of the following statements concerning the total mechanical energy of the block-spring system this situation is true?
The total mechanical energy is constant as the block moves back and forth.
Which one of the following statements concerning the elastic potential energy of a ball attached to a spring is true when the ball is moving in simple harmonic motion?
The elastic potential energy is at its minimum when the spring is in its equilibrium position.
A ball is attached to a vertical spring. The ball is initially supported at a height y so that the spring is neither stretched nor compressed. The ball is then released from rest and it falls to a height y h before moving upward. Consider the following quantities: translational kinetic energy, gravitational potential energy, elastic potential energy. When the ball was at a height y (h/2), which of the listed quantities has values other than zero joules?
translational kinetic, gravitational potential, and elastic potential energies
A simple pendulum consists of a ball of mass m suspended from the ceiling using a string of length L. The ball is displaced from its equilibrium position by an angle and released. What is the magnitude of the restoring force that moves the ball toward its equilibrium position and produces simple harmonic motion?
mg (sinθ )
A simple pendulum consists of a ball of mass m suspended from the ceiling using a string of length L. The ball is displaced from its equilibrium position by a small angle and released. Which one of the following statements concerning this situation is correct?
If the length of the pendulum were increased, the angular frequency of the pendulum would decrease.
Under which one of the following conditions does the motion of a simple pendulum approximate simple harmonic motion?
when the pendulum swings through a small angle
Which one of the following statements best describes fluids?
Fluids are gases or liquids.
Which of the following is equal to the Earth's atmospheric pressure at sea level?
1.013 × 10⁵Pa
Which one of the following statements best describes the pressure in a static, homogeneous liquid?
At a given depth in the liquid, the pressure is the same at all points at that depth.
Which one of the following statements best explains why the pressure in a static fluid increases as the depth increases?
As the depth increases, the weight of the water above a particular level increases.
Two dams are identical with the exception that the water reservoir behind dam A extends twice the horizontal distance behind it as that of dam B. Which one of the following statements regarding these dams is correct?
The horizontal distance of the water behind the two dams does not determine the force on the dams.
Which of the following devices is used to measure atmospheric pressure?
Which of the following devices is used to measure gauge pressure?
Which one of the following statements concerning a completely enclosed fluid is true?
Any change in applied pressure on the fluid produces an equal change in pressure at all points within the fluid
Complete the following statement: When an object is placed in a fluid, a buoyant force is exerted on it that is directed upward with a magnitude
that is equal to the weight of the fluid displaced by the object.
Which law, principle, or equation specifies that the mass flow rate of a fluid at two positions along a tube must be constant?
equation of continuity
Complete the following statement: Bernoulli's principle is a statement of
energy conservation in dynamic fluids.
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