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A small mirror is attached to a vertical wall, and it hangs adistance of 1.59 m above the floor. The mirror is facing dueeast, and a ray of sunlight strikes the mirror early in the morningand then again later in the morning. The incident andreflected rays lie in a plane that is perpendicular to both thewall and the floor. Early in the morning, the refleted raystrikes the floor at a distance of 3.95 m from the base of thewall. Later on in the morning the ray is observed to strike the floor at a distance of 1.39 m from the wall. The earth rotates at a rate of 15.0o per hour. How much time(in hours) has elapsed between the two observations?
A disk of radius 215 cm rotates about its axis. Points on the disk\'s rim undergo tangential acceleration of magnitude 1.13 m/s2. At a particular time the rim has a tangential speed of 1.77 m/s. At a time 0.907 seconds later, what is the tangential s..
When on the ground, Ian's weight is measured to be 692 N. When Ian is on an elevator, his apparent weight is 796 N. What is the net force on the system
A weight lifter raises a 972 N weight a vertical distance of 1.87 m. Compute the work done by the force exerted on the weight by the weight lifter
Two charged particles, q1 = ?2.50×10?3 C and q2 = +3.850e-3 C, are separated by a distance of 5.00 cm. What is the electric potential energy of this configuration
A crying baby emits sound with an intensity of 8 × 10-8 W/m2. What is the intensity level for a set of twins? The lowest detectable intensity is 10-12 W/m2
A copper plate has a circular hole with a diameter of 1.000 cm. In order to drop a pyrex glass marble 1.0031 cm in diameter through the hole in the plate, how much must the temperature of the system be raised
q1. an engine does 20000 j of work and rejects 6120 j of heat into a cold reservoir whose temperature is 285 k. what
A man pushing a mop across a floor causes it to undergo two displacements. The first has a magnitude of 150 cm, Find the magnitude and direction of the second displacement
A 24-kg boy stands 6 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 240 kg m2. Calculate the speed of the boy relative to the surface of the merry-go-round
A 100 kg man is three fourths of the way up a 10 m ladder that is resting against a smooth frictionless wall. What is the normal force of the wall on the ladder
A rocket has a mass of 1.25 x 106 kg including fuel. Determine the constant rate at which the fuel must be burned
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.839 A) sin [(204 Hz)t]
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