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When the power to an electric motor is turned on the motor reaches its rated speed of 2400 rpm in 4s, and when the power is turned off the motor coasts to rest in 40s. Assuming uniformly accelerated motion, determine the number of revolutions that the motor executes
(a) In reaching its rated speed,
(b) In coasting torest.
A 0.060 kg handball is thrown straight toward a wall with the speed of 14 m/s. It rebounds straight backward at a speed of 6.5 m/s. If the ball is in contact with wall for 3.0 ms, what average force is exerted on the wall by the ball.
A car moving at 78mi/hr approaches a yield sign 70m ahead. The driver slows the car with a constant acceleration of -4.5m/s2 by hitting the brakes. How long does it take the car to reach the yield sign
three particles of mass m = 0.027 kg are fastened to three rods of length d = 0.13 m and negligible mass. determine the rotational inertia of the assembly
the nucleus of an atom consists of protons and neutrons no electrons. a nucleus of a carbon-12 isotope contains six
imagine a truck with a mass of 23 metric tons t 1 t1000 kg barrelling down a highway at a speed of 55 mih. what is the
A boy of mass 60.8 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leapt was 9.5 m above the net. What is the average force on the net due to the boy during the interval
A basketball player makes a jump shot. The 0.560-kg ball is released at a height of 1.80 m above the floor with a speed of 7.07 m/s. What is the work done on the ball by air resistance
A steel cylinder with a radius of 5cm and a length of 4cm is placed in end to end thermal contact with a copper cylinder of the same dimensions. If the free ends of the two cylinders are maintained at constant temperatures of 95C(steel) and 15C (cop..
A capacitor is connected across an ac generator whose frequency is 753 Hz and whose peak output voltage is 140 V. The rms current in the circuit is 3.0 A. What is the capacitance of the capacitor
A 0.629-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. Find the momentum of the electron
a helium-neon laser beam has a wavelength in air of 633 nm . it takes 1.38 ns for the light to travel through 30 cm of
Two point charges lie along the y axis. A charge of q1 = -12.0 µC is at y = 7.0 m, find the point at which the total electric field is zero
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