Thermodynamics Homework due in 2 hours ASAP

The kinetic energy of the pendulum with the slender rod (3kg) and the disk(10kg) is:

The kinetic energy of the pendulum with the slender rod (3kg) and the disk(10kg) is:

A.)62.4ω2

B.)46.8.4ω2

C.)15.7ω2

D.) 31.2ω2

A force of P = 300 N is applied to the 60-kg cart. Determine the acceleration in m/s^2:

A.) None of the above

B.) 5

C.) 2.5

D.) 8.2

The slender rod is subjected to a couple moment M and a constant force P, which is always applied perpendicular to the end of the rod. What is the work done by the force P when the rod swing from its vertical position (θ = 0°) to the position shown?

The slender rod is subjected to a couple moment M and a constant force P, which is always applied perpendicular to the end of the rod. What is the work done by the force P when the rod swing from its vertical position (θ = 0°) to the position shown?

A.)Plsinθ

B.) -Plsinθ

C.) -Plθ

D.) -Plcosθ

E.) Plθ

If a rigid body rotates about its center of gravity, its translational kinetic energy is zero at all times

If a rigid body rotates about its center of gravity, its translational kinetic energy is zero at all times

True

False

When θ = 90°, the horizontal component of the reaction at pin A is:

A.) 0

B.) -mg

C.) 1/2mω2

D.) mg

The slender rod has a mass m and is suspended at its end A by a cord. If the rod is at rest initially and then receives a horizontal blow giving it an impulse I at point P, what is the angular velocity of the rod right after the blow?

A.) I/(ml)

B.) I/(2ml)

C.) 2I/(ml)

D.) I/(2ml)

E.)2I/(3ml)

The spring is unstrected when θ = 0°. What is the work done by the spring when the bar has rotated upward from θ = 90° (B below A) to θ = -90° (B above A)

A) 36 (J)

B.) -72 (J)

C.) 72 (J)

D.) -144 (J)

E.) -36 (J)

A disk and a sphere, each of mass m and radius r, are released from rest. After 2 full turns, which body has a larger angular velocity? Assume roll without slip:

A.) The two are equal

B.) Disk

C.) Cannot be determined

D.) Sphere