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a) Why can a laser disc that is written with a blue laser store more information than a laser disc that is written with a red laser?
b)Laser light with a circular cross-section passes through a slit in an opaque card.The slit is shaped as shown below.After passing through the slit and traveling a great distance the beam no longer will have a circular cross section.Which of the spot patterns shown is the most likely shape of the beam after passing through the slit and traveling a great distance.Briefly explain.
A spacecraft is 110 km above the surface of the moon. What is the velocity of the spacecraft
A hydrogen atom initially in the ground state absorbs a photon, determine the wavelength and frequency of the photon
Jack and Jill ran up the hill at 3.5 m/s. The horizontal component of Jill's velocity vector was 2.5 m/s. Determine what was the angle of the hill
A converging lens of focal length 20 cm is placed between an object and a screen which are separated by 1.8 m. Where should the lens placed in order to form an image on the screen
A cannon shoots a ball with an initial velocity of 152-m/s and a launch angle of 62°. The gravitational acceleration is 9.80 m/s2. Assuming no air resistance, how long would the cannonball stay in the air.
The driver of an 1800 {kg} car travelling on a horizontal road at 100 kmh suddenly applies the brakes. Because of a slippery pavement, the friction of the road on the tires of the car, which is what slows down the car, is 20.0 percent of the weight o..
A 3 kg mass is thrown directly upward at a velocity of 6 m/s. What is the velocity at the top
A flashlight on the bottom of a 4.45 m deep swimming pool sends a ray upward and at an angle so that the ray strikes the surface of the water 1.65 m from the point directly above the flashlight. What angle (in air) does the emerging ray make with t..
An asteroid is discovered heading straight toward Earth at 14 km/s.An international team manages to attach a giant rocket engine tothe asteroid. The rocket fires for 10 min, after which the asteroidis moving at 28 degrees to its original path at a sp..
A charge q is distributed uniformly around a thin ring ofradius r. What is the direction of this magnetic moment if the chargeis positive
An airplane is flying in a horizontal circle at a speed of 133.3 m/s. Banked for this turn, What is the radius of the circle in which the plane is flying
A simple pendulum has a length L and a mass m. At its highest point, the pendulum mass is 0.25L above its lowest point. What is the speed of mass when it is at its lowest point
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