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A ship is heading off to Barnard's star at 0.700c. When it passed a space station(at rest with respect to the Earth) few days out from Earth, the ship fires a "photon torpedo" in the forward direction and another in the reverse direction. According to L. Nimoy who is on the bridge of the ship, the torpedoes have a speed relative to the ship of 0.70c. On a space time diagram, determine the direction and speed of each torpedo as seen by the station. Check the answers by using the relativistic addition of velocities formula.
An archer pulls back 0.75 m on a bow which has a stiffness of 200 N/m. The arrow weighs 50 g. What is the velocity of the arrow immediately after release
Compute the angular momentum of the earth arising from the following motions Earth's orbital motion around the sun
A magnetic field and an electric field, in separate regions of space, have strengths of 1.25 T and 1.25 N/C, respectively. What is the energy density of the magnetic field
A mass of 9.30 kg is suspended from a 1.45 m long string. It revolves in a horizontal circle, Calculate the angle between the string and the vertical
A spherical pot of hot coffee contains 0.75 L of liquid (essentially water) at an initial temperature of 95?C. The pot has an emissivity of 0.60, Calculate the coffee's rate of heat loss by radiation
A 62.0kg skier is moving at 6.50m/s on a frictionless, horizontal snow-covered plateau when she encounters a rough patch 3.50m long. How fast is the skier moving when she gets to the bottom of the hill
A 9 m, 220 N uniform ladders rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50° angle with ground. How far up the ladder can an 850 N person climb before ladder beg..
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 56° above the horizontal. The weight of the ladder is 35 pounds. A 77 lb boy climbs 6.0 ft up the ladder. What is the magnitude of the friction force exerted on the lad..
Consider an airplane of wing area 6.8 m^2 (both wings combined) flying through air of density 1.13 kg/m^3. What is the net upward lift force on the plane
A solid disk (r=0.20 m, M=0.50 kg) is suspended fro the end of an L=0.30m long rod (m=0.30 kg, cross-sectional area of 2.0 cm^2). WHAT IS THE PENDULUM'S PERIOD FOR SMALL ANGLE OSCILLATIONS
One generator uses a magnetic field of 0.15 T and has a coil area per turn of 0.050 m2. What magnetic field should be used in the second generator, so that its peak emf is the same as that of the first generator
A 55-kg swimmer is standing on a stationary 210-kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.6 meter per second relative to the shore. Calculate the recoil velocity that the raft would have if there were ..
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