center of mass

A plane, fling horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion a. is zero b.moves vertically c. moves horizontally d. moves along a parobolic path

a hoop of radius

a hoop of radius 0.5 m and a mass of 0.2kg is released from rest and allowed to roll down an inclined plane. how fast is it moving after dropping from a vertical distance of 3m/ a. 5.4 m/s b. 3.8 m/s c. 7.7 m/s d. 2.2 m/s

a wheel with a momentum

a wheel with a momentum of inertia of 8.0 kg-m^2 and a rotational kinetic energy of 155 Joules requires what torque to bring it to rest in 4 seconds? a.-1.2 N-m b. -1.0 N-m c. -1.8 N-m d. -1.6 N-m

a force is applied to the

a force is applied to the end of a 2ft long uniform board wheighing 50lbs, in order to keep it horizotal, while it pushes against a wall at the left. if the angle the force makes with the board is 30 degreees, the magnitude of the applied force F is a. 28.9lb b. 50lb c. 100lb d. 57.7 lb

consider two uniform solid spheres

consider two uniform solid spheres where both have the same diameter, but one has twice the mass of the other. The ratio of the larger moment of inertia to that of the smaller moment of inertia is a. 10 b. 4 c. 6 d. 2 e. 8

a ball, solid cylinder and a hollow pipe

a ball, solid cylinder and a hollow pipe all have equal masses and radii. If the three are released simultaneously at the top of an inclined plae, which will reach the bottom first? and y? a.the cylinder b. the pipe c. the ball d. none othe listed

a diver can change her rate

a diver can change her rate of rotation in the air by "tucking" her head in and bending her knees. Lets assume that when she is stretched out straight she is rotating at 1 revolution per second. Now she goes into the "tuck and bend", effectively shortening the length of her body in half. What will her roation be now? a. 5Hz ...continues

watts, voltage

A 120 V house circuit (parallel) has the following bulbs and appliances turned on: 25 W, 40 W, 60 W, 900 W and 75 W. Find the equivalent resistance of these bulbs and appliances.

power

A wire 1.2 m long and 0.4 mm diameter has a resistance of 4.9 Ώ. Calculate the resistance of another wire of the same material whose length is 0.8 m and diameter is 0.24 mm.

currents

A capacitor with capacitance 500 pF is charged with a charge of magnitude 70.0 nC on each plate. The capacitor is then connected to a resistance (e.g., from a meter) of 1.38 M Ώ (1.38 x 10^6 Ώ) (a) What is the current through the resistor just after the connection is made? (b) What is the time constant of this ...continues