Physics Rotational Mechanics Level: High School
A particle is moving in uniform circular motion on a friction free table. Which of the following statement is true ?a. The tangential acceleration is zero.
b. The tangential acceleration is non-zero.
c. The radial acceleration is non-zero.
d. Both a and c are true.
e. Both b and c are true.
Physics Rotational Mechanics Level: High School
The angular velocity of a rotating body is given by omega(t) = 3 rad/s . The initial angular velocity position in 2 radians . Which function describes the angular position at any time t .a. è(t) = 0 radians.
b. è(t) = 3t + 2 radians.
c. è(t) = (3t^2)/2 + 2 radians.
d. è(t) = 3t radians.
e. è(t) = 2 radians.
Physics Force & Laws Of Motion Level: High School
The ideal Atwood machine has a massless , frictionless pulley and a massless rope . The mass of block A is 5.0 kg , and the mass of block B is 7.0 kg . The magnitude of acceleration of block B is :a. 1.0 m/s^2
b. 1.64 m/s^2
c. 4.90 m/s^2
d. 9.81 m/s^2
e. 58.9 m/s^2
Physics Force & Laws Of Motion Level: High School
A body in a system which obeys Newton’s Second Law is acted upon by a net force of zero Newtons . Which of the following statement about its motion is true ?a. The acceleration of the body must be zero .
b. The acceleration of body must be non-zero .
c. The velocity of the body must be zero .
e. Both a and c are true .
Physics Rotational Mechanics Level: High School
A disk with a moment of inertia I = 0.5 kg-m^2 is rotating about the center of mass with an angular velocity of omega = 2 radians/sec . It is decelerated at a rate of 0.5 radians/s2 . What is the applied constant torque ?a. 0.750 N-m
b. 0.250 N-m
c. 1.00 N-m
d. 0.500 N-m
e. 4.00 N-m
Physics Rotational Mechanics Level: High School
A rigid body is free to translate and rotate . It is in accelerated motion and it is rotating about its center of mass at a constant angular velocity , Therefore ,a. the sum of all external forces is zero .
b. the body is in static equilibrium .
c. the body’s kinetic energy is constant .
d. All of the above .
e. The sum of all external forces is zero .
Physics Gravitation Level: High School
An astronaut has a weight W on the Earth . On a planet having twice the mass of the Earth and same radius as the Earth , the astronaut weighs :a. W^2
b. 4W
c. W
d. 2W
e. W/2
f. None of the above
Physics Waves And Oscillations Level: High School
A vertical spring has an equilibrium length of 3.0 meters. When a 10-kg mass is attached , its new equilibrium length is 3.2 meters . What is the spring constant ?a. 30 kg-m
b. 2 kg-m
c. 50 N/m
d. 490 N/m
e. 5.0 kg-m
Physics Rotational Mechanics Level: High School
The position of a pendulum is described by è(t) = 0.04 Cos (t + pi / 2)z. The angular frequency of the pendulum is :a. pi/2 radians/sec
b. 1 radian/sec
c. 2 pi radians/sec
d. 2 pi t radians/sec
c. è/22 pi radians/sec
Physics Force & Laws Of Motion Level: High School
Which of the following are inertial reference frames ?a. A non-accelerating reference frame .
b. A reference frame moving at a constant velocity .
c. A reference frame at rest .
d. A reference frame in which Newton’s Law are valid .
e. All of the above .
f. Only a,b and c are true .
Physics Rotational Mechanics Level: High School
Rocket thrust can be explained by:a. Conservation of energy.
b. Conservation of forces.
c. Conservation of angular momentum
d. Conservation of linear momentum
e. Conservation of mass.
f. None of the above.
Physics Rotational Mechanics Level: High School
The angular momentum of the planets orbiting about the Sun is conserved because:a. L= constant.
b. T = 0
c. Sigma r.F = 0
d. The gravitational force between the Sun and the planet is a central force.
e. All of the above.
f. Only a and c are true.
Physics Rotational Mechanics Level: High School
A torque of 100 kg-m^2/s^2 is applied to a flywheel with I = 10 kg-m^2. The rate of change of the angular momentum of the flywheel is :a. 100 kg-m^2/s^2
b. 10^3 kg-m^2/s^2
c. 10 kg-s^2/S^2
d. 10^-2 s^2/kg-m^2
e. 10^4 kg^2-m^4/s^4
Physics Rotational Mechanics Level: High School
If all the passengers on a shipping , frictionless , non-powered merry-go-round should suddenly move from edge towards the center.a. There would be no noticeable effect.
b. The angular velocity would increase.
c. The angular velocity would decrease.
d. The angular momentum would be altered.
e. Both b and d are correct.
Physics Rotational Mechanics Level: High School
A sphere rolling down a plane :a. Has translational kinetic energy.
b. Has rotational kinetic energy.
c. Has the potential to do work.
d. All of the above.
e. Only a and b above.