Physics Rotational Mechanics Level: Misc Level
A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s.By changing the position of her arms, the skater decreases her moment of inertia by 50%. What is the skater,s final angular speed?
Physics Rotational Mechanics Level: Misc Level
A string is wrapped around a pulley of radius 0.10 m and moment of inertia 0.15 kg.m2 The string is pulled with a force of 12 N. What is the magnitude of the angular acceleration of the pulley?
Physics Rotational Mechanics Level: Misc Level
A 50 N.m torque acts on a wheel of moment of inertia 150 kg. m2. If the wheel starts from rest, how long will it take the wheel to make one revolution?
Physics Rotational Mechanics Level: Misc Level
A meter stick is pivoted at the 0.50-m line. A 3.0-kg object is hung from the 0.10-m line.Where should a 5.0-kg object be hung to achieve equilibrium?
Physics Heat & Thermodynamics Level: Misc Level
A inventor claims to have constructed an engine that has an efficiency of 75% when operated between the boiling and freezing points of water. Is this possible?Explain.
Physics Heat & Thermodynamics Level: Misc Level
Find the minimum amount of energy reqired to completely melt at 130 g of silver, initially at 15.0 C.
Physics Heat & Thermodynamics Level: Misc Level
A steel rod is 3.000 cm in diameter at 25 C. A brass ring has an interior diameter of 2.992 cm at 25 C.At what common temperature will the ring just slide onto the rod?
Physics Heat & Thermodynamics Level: Misc Level
A 2.0 kg block of lead melts at its melting point of 327.3 C. Calculate the change in its entrophy.
Physics Work,Power & Energy Level: Misc Level
A 3.0 kg cart moving to the right with a speed of 1 m/s has a head-on collision with a 5.0 kg cart that is initially moving to the left with a speed of 2 m/s. After the collision, the 3.0 kg cart is moving to the left with a speed of 1 m/s. What is the final velocity of the 5.0 kg cart?
Physics Work,Power & Energy Level: Misc Level
A projectile is launched with 200 kg* m/s of momentum and 1000J of kinetic energy. What is the mass of the projectile?
Physics Kinematics Level: Misc Level
A skier leaves the top of a slope with an initial speed of 5.0 m/s.The speed at the bottom is 13 m/s. What is the height of the slope?
Physics Kinematics Level: Misc Level
A pebble rolls off a roof and falls vertically.Just before it hits the ground, it,s speed is 17 m/s. Neglecting air resistance, what is the height of the building?
Physics Work,Power & Energy Level: Misc Level
A man is using a human powered mower to cut grass. The mower is pushed with a force of 45 N directed at an angle of 41% below the horizontal direction. What is the work done in pushing the mower 9.1 m across the yard?
Physics Force & Laws Of Motion Level: Misc Level
A rope connects Boat A to Boat B.Boat A starts from rest and accelerates to a speed of 9.5 m/s in a time of 47 s. The mass of Boat B is 540 kg. Assuming a constant frictional force of 230 N on Boat B, what is the magnitude of the tension in the rope that connects the boats during the time of acceleration?
Physics Force & Laws Of Motion Level: Misc Level
A 20 kg object is held vertically from a fixed plank by two vertical ropes. What is the tension in each rope?
