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A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 93 kg. The mass of the rock is 0.27 kg. Initially the wagon is rolling forward at a speed of 0.49 m/s. Then the person throws the rock by a speed of 15m/s. Both speeds are relative to the ground. Discover the speed of the wagon after the rock is thrown (a) directly forward in one case and (b) directly backward in another.
A block of weight 3.9N is launched up a 30%u2218inclined plane 2.35m long by a spring with k = 2.35 N/m and maximum compression 0.10m. How much kinetic energy does it have there
A house is 48.9 ft long and 29.7 ft wide, and has 7.71 ft high ceilings. What is the volume of the interior of the house in cubic centimeters
Object O1 is 15.0 cm to the left of a converging lens of 10.0-cm focal length. A second lens is positioned 10.0 cm to the right of the first lens, What is the focal length of the second lens
A home run is hit in such a way that the baseball just clears a wall 13 m high, located 135 m from home plate. Find the time it takes the ball to reach the wall
In the old west, a marshal riding on a train traveling 35.0 m//s observes a duel between two men standing on the Earth 55.0 m apart parallel to the train. The marshal’s instruments indicate that in his reference frame the two men fired concurrently. ..
the electric field midway between two equal but opposite point charges is 856 nc and the distance between the charges
Two long parallel wires carry currents of 3.95 A and 4.77 A. The magnitude of the force per unit lengh acting on each wire is 6.85 × 10-5 N/m. Find the separation distance of the wires expressed in millimeters
an RLC series circuit consists of a 24 V (rms) 0.50 Hz AC power supply, a 25 ohm resister, a 10 H inductor, and a 0.050 F capacitor, what is the rms current through the inductor
A spring vibrates at 8 Hz when a weight of .82 kg is hung from it. What is the elastic constant of the spring
Obtain an approximate solution for this case. Sketch your solution E(t) and compare the result with the usual damped oscillator solution. The oscillator has mass m, spring k, and constant friction force Fo. (You may find it helpful to write a diff..
A .230 kg baseball is thrown with a speed of 41 m/s. If the above ball comes to rest in the catcher's mitt in .085 seconds, how much force does the ball apply on the catcher's mitt
A particle falls in Earth's gravity. The force of air resistance is F = ??v1* v2 where v1 is the velocity, v2 is the speed, and ? is a constant. (The direction of the force is opposite to the velocity, and the magnitude of the force is ?v2.) If th..
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