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On the Moon\'s surface, lunar astronauts placed a corner reflector, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. The Earth\'s atmosphere slows down light. Assume the distance to the Moon is precisely 3.84 × 108 m, and Earth\'s atmosphere (which varies in density with altitude) is equivalent to a layer 20.0 km thick with a constant index of refraction n = 1.000293. What is the difference in travel time for light that travels only through space to the moon and back and light that travels through the atmosphere and space?
A car traveling at 55 km/h hits a bridge abutment. What magnitude of force (assumed constant) acts on the passenger's upper torso, which has a mass of 39 kg
A 75 g piece of ice at an initially unknown temperature is placed into a glass of 350 g of water sitting at room temperature, What is the specific heat capacity of the unknown metal
A cube of ice with a mass of 150 g at a temperature of 0.0oC is placed in 750 g of water at a temperature of 25.0oC. The water and ice are in an insulating container so that no heat is lost to the environment. The water and ice eventually come to t..
A point source of light is submerged 3.58 m below the surface of a lake and emits rays in all directions. On the surface of the lake, directly above the source, the area illuminated is a circle. What is the maximum radius that this circle could have?
An 80 lb kangaroo exerts a constant force on the ground in the first 2 ft of its jump, and rises 6 ft higher. When it carries ababy kangaroo in its pouch, it can rise only 5.5 ft higher. What is the weight of the baby?
A satellite is in a circular orbit around the earth. The period of the satellite is 22 hour. Determine what is the speed of the satellite
In the figure below a crowbar is used to lift a weight. If a down ward force of 228 N is applied to the end of the bar, how much weight does the other end bear? The crowbar itself has negligible weight. (Let r1 = 29.0 cm and r2 = 4.70 cm.)
A 5,20 g bullet moving at 672 m/s strikes a 700 g wooden block at rest on a frictionless surface. What is the speed of the bullet-block center of mass
A 43.5 mA current is carried by auniformly wound air-core solenoid with 460 turns, a 17.0 mmdiameter, and 11.0cm length. Compute the magnetic flux through each turn
A proton orbits a long charged wire, making 5.66 *106 revolutions per second. What is the wire's linear charge density
A massive steel cable drags a 10 kg block across a horizontal, frictionless surface. What is the mass of the cable
A projectile is launched straight up at 60 m/s from a height of 73 m, at the edge of a sheer cliff. Find the maximum height of the projectile above the point of firing
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