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From the top of a mountain a hiker looks at the next mountain top in the distance and notes the compass direction of the peak. He walks some distance at right angles to his initial line of sight and again measures the compass direction to the same peak. Looking at his map he sees that the mountain is 8.72 km away. If the initial compass bearing was 90 degrees, and the new compass bearing is 82 degrees, how far has the hiker walked?
An engine does 17200 J of work and rejects 6470 J of heat into a cold reservoir whose temperature is 272 K
Two converging lenses, one with f = 5.0 cm and the other with f = 50 cm, are made into a telescope. What are the magnification of this telescope
A cockroach of mass m lies on the rim of a uniform disk of mass 3 m that can rotate freely about its center like a merry-go-round. find the angular velocity of the cockroach-disk system
A child goes down a water slide and splashes into the water. At the top, the child has a speed of 4 m/s. how fast would the child be moving when she hits the water
two 8.00 kg blocks are connected by a massless string over a frictionless pulley of radius 10.0 cm and rotational inertia, I. What is the inertia of the pulley
a 2.00m by 3.00m plate of aluminum has a mass of 324kg. What is the thickness of the plate
For the circuit shown in the following figure both meters are idealized, the battery has no appreciable internal resistance, and the ammeter reads 1.19 A. What does the voltmeter read
A barbell spins around a pivot at its center at A. The barbell consists of two small balls, each with mass 450 grams (0.45 kg), Calculate the moment of inertia I of the barbell
Two boxes, A and B, are connected by a (mass-less) cord and are resting on a smooth (frictionless) table. Find the tension force in the cord connecting the two boxes
What is the wavelength of the waves on the string?
Suppose a car's brakes can produce an acceleration of -7 m/s2. what is the minimum distance necessary to stop the car
Two capacitors C1 = 3.8 ?F, C2 = 17.8 ?F are charged individually to V1 = 14.4 V, V2 = 4.3 V. Calculate the final potential difference across the plates of the capacitors once they are connected
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