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In a CD player, the speed of the surface of the CD at the point where the laser is reading the CD must be a constant 1.30 m/s. The CD needs to vary angular speed as the laser reads at different points along the CD. The laser is 54 mm from the center. What should the angular speed be in rev/sec for the CD?
A. 3.8 rev/sec
B. 12.5 rev/sec
C. 6.3 rev/sec
D. 24.2 rev/sec
A spring is hanging vertically at equilibrium. When a mass of .5 kg is attached to the spring, the spring stretches by 2.1 cm. What is the spring constant (k) for the spring?
A. 0.43 N/cm
B. .21 N/cm
C. 4.7 N/cm
D. 2.3 N/cm
A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer
A monatomic ideal gas that is initially at a pressure of 1.43×105Pa and with a volume of 8.40×102 m3 is compressed adiabatically to a volume of 3.80 × 102 m3. How much work is done by the gas during the compression
Two plane waves have the same omega, k and amplitude E, but opposite circular polarisations (i.e. left and right). Show that the superposition of the two waves is linearly polarised, with amplitude 2E.
Suppose you are in a high-speed boat moving at 18.0 m/s directly into approaching 1.10 m wavelength wave. What is the time interval between wave peaks hitting the boat
A crate of mass 10.0 kg is pulled up a rough incline with aninitial speed of 1.50 m/s. The pulling force is 100.0 Nparallel to the incline, which makes a 20.0 degree angle with thehorizontal. The coefficient of kinetic friction is 0.400, and the c..
You are driving along a highway at 25.5 m/s when you hear a siren. You look in the rear-view mirror and see a police car approaching you from behind with a constant speed, How fast was the police car moving
Consider a force F = 80 N applied to a beam as shown in Fig. 8-37. The length of the beam is ? = 5.0 m,and ? = 37°, so that x = 3.0 m and y = 4.0 m. Of the following expressions, which ones give the correcttorque produced by the force F? around point..
A student strikes a long aluminum rod at one end. Another student, at the other end with her ear close to the rod, How long is the rod
A cube of aluminum 0.50 meter on a side is immersed one-fourth in water and three-fourths in glycerin. Determine the normal force on the cube in Newton
An asteroid is discovered to have a tiny moon that orbits it in a circular path at a distance of 115 km and with a period of 49.0 h. Find the escape velocity from the asteroid
An object's true weight is 123 N. When it is completely submerged in water, its apparent weight is 82 N. what is the density of the object
A merry-go-round accelerates from rest to 0.78rad/s in 34 s. Assuming the merry-go-round is a uniform disk of radius 7.0 m, calculate the net torque required to accelerate it
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