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A railroad flatcar of weight 7840 N can roll without friction along a straight horizontal track. Initially, a man of weight 557 N is standing on the car, which is moving to the right with speed 25 m/s; see the figure. What is the change in velocity of the car if the man runs to the left so that his speed relative to the car is 8.0 m/s?
A radio-frequency EM plane wave propagates in the x direction. Your radio gets the best reception when its antenna is parallel to the y-z plane, at a 30° angle to the y axis. Sketch this situation, and indicate the direction of the E and B vectors..
What is the buoyant force acting on a cube of copper that measures 4.49 cm on its each side if it is immersed in water. The density of copper is 8933kg/m3
When a satellite orbits the earth in a non-circular orbit which of the following is true.
A proton and an alpha particle (charge = 2e, mass = 6.64 10-27 kg) are initially at rest, separated by 3.20 10-15 m. Find the speeds of the proton and alpha particle
An electron enters a magnetic field with a speed of 1.41x 10^6 m/s heading north and undergoes a semicircular path towards the east with a diameter of 10cm. find the time required to complete this semicircle
A piano tuner sounds two strings simultaneously. One has been previously tuned to vibrate at 283.0 Hz. The tuner hears 5.0 beats per second. What was the original frequency of the untuned string
A uniform disc of mass m and radius R is rigidly mounted coaxially with a lightweight disc of radius r = R/2, to a horizontal shaft, on which combination is free to rotate frictionless. Light strings are wound in opposite directions about the cyli..
A 6.00 g bullet, traveling horizontally with a velocity of magnitude 450m/s, is fired into a wooden block with mass of 0.780kg, initially at rest on a level surface. What is the decrease in kinetic energy of the bullet
Sam, whose mass is 80kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 250N and a coefficient of kinetic friction on snow of 0.1, What is Sam's top speed
A generator connected to an RLC circuit has an rms voltage of 120V and an rms current of 34mA. what is the inductive reactance of the circuit
A block (mass = 2.0 kg) is hanging from a massless cord that is wrapped around a pulley (moment of inertia = 1.1 10-3 kg · m2), Find the angular acceleration of the pulley
The flash of a digital camera totally consumes the energy of an arrray of identical 7 F capicitors when a picture is taken, How many capicitors are in the array
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