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 24 mm from the center. What should the angular speed be in rev/sec for the CD?
In a CD player, the speed of the surface of the CD at the point where...
On an audio compact disc (CD), digital bits of information are encoded sequentially along a spiral path. Each bit occupies about 0.28 μm . A CD player's readout laser scans along the spiral's sequence of bits at a constant speed of about 1.2 m/s as the CD spins. Determine the number N of digital bits that a CD player reads every second.
Find the linear speed of a point traveling at a constant speed along the circumference of a circle with radius r=6 mm and angular speed ω=π rad18 sec.
a. How much work is done by the motor in a CD player to make a CD spin, starting from rest? The CD has a diameter of 12.0 cm and a mass of 15.8 g. The laser scans at a constant tangential velocity of 1.20 m/s. Assume that the music is first detected at a radius of 38.0 mm from the center of the disk. Ignore the small circular hole at the CD’s center. b. A trap door, of length...
On a compact disc (CD), music is coded in a pattern of tiny pits arranged in a track that spirals outward toward the rim of the disc. As the disc spins inside a CD player, the track is scanned at a constant linear speed of v = 1.25 m/s. Because the radius of the track varies as it spirals outward, the angular speed of the disc must change as the CD is played. Let's see what angular acceleration is required...
A bicycle wheel is rolling with constant angular speed along a horizontal surface where we spotted it. But the surface changes to downward slope and then back to horizontal as shown in the sketch. Draw angular velocity vs. time and angular acceleration vs. time graph of the wheel.
007 10.0 points A potter's wheel moves from rest to an angu- lar speed of 0.10 rev/s in 38.5 s. Assuming constant angular acceleration, what is its angular acceleration in rad/s2? Answer in units of rad/s. 008 10.0 points The tape in a videotape cassette has a total length 203 m and can play for 1.8 h. As the tape starts to play, the full reel has an outer radius of 47 mm and an inner radius of 14 mm....
28 A certain wheel turns through 100 rev in 15 s its angular speed at the end of the period being 12 rev/s (a) What was the angular speed of the wheel at the beginning of the 15-s interval, assuming constant angular acceleration? (b) How much time had elapsed between the time the wheel was at rest and the beginning of the 15-s interval? 29 A hoop of radius 2.5m has a mass if 150 kg. It rolls along a...
A 2.80-kg box is sliding along a frictionless horizontal surface with a speed of 1.8 m/s when it encounters a spring. a. Determine the force constant of the spring, if the box compresses the spring 5.50 cm before coming to rest. b. Determine the initial speed the box would need in order to compress the spring by 1.30 cm. A box slides from rest down a frictionless ramp inclined at 39.0° with respect to the horizontal and is stopped at the bottom of...
A bicycle wheel of radius 0.290 m rolls without sliding on a horizontal surface at a constant angular speed of 15.0 rad/s. A piece of gum of mass 5.30 g is stuck to the rim as shown in the diagram. (a) What is the magnitude of the angular momentum of the gum when it is at location A relative to the points indicated below? the center of the wheel. 0.0087 kg-m/s 0.0267 x the point of contact, C What is...
Problem 4 A uniform solid spherical ball of mass M and radius R rests on a horizontal surface. Assume a constant coefficient of friction (this means that the frictional force is equal to the normal force multiplied by u). The acceleration due to gravity is g. At time t 0, the bal is struck impulsively on center, causing it to go instantaneously from rest to initial rotation horizontal speed vo with a no (a) Find the horizontal speed, and the...