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An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. He was supposed to travel due north for 44 km, but when the snow clears, he discovers that he actually traveled 7.8 km at 55 degrees north of due east.a) how far must he travel to reach base camp?b) in what direction must he travel? (counterclockwise from due east)
Blue light of frequency 6.0 1014 Hz falls on the surface of potassium, which has a work function of 2.26 eV. Find the maximum kinetic energy of emitted electrons
A chemistry student with a mass of 75 kg is riding a steadily moving Ferris wheel. What would the normal force be on the student at the top of the wheel if the wheel's velocity were doubled
Capacitors C1 = 5.0 µF and C2 = 2.0 µF are charged as a parallel combination across a 250 V battery. Calculate the resulting charge on each capacitor
A 249.0 kg block of ice at 0*C is placed in a large lake. The temperature of the lake is just slightly higher than 0*C, and the ice melts. What is the entropy change of the ice
A generator connected to an RLC circuit has an rms voltage of 130{\rm V} and an rms current of 30{\rm mA}. what is the inductive reactance of the circuit
A 46-cm-long wire with a mass of 10.5 g is under a tension of 52.0 N. Both ends of the wire are held rigidly while it is plucked. What is the speed of the waves on the wire
Because of the Earth's rotation, a plumb bob does not hang exactly along a line directed to the center of the Earth. How much does the plumb bob deviate from a radial line
A galvanometer with a coil resistance of 14.1 is used with a shunt resistor to make a nondigital ammeter that has an equivalent resistance of 0.755. determine the full-scale current of the galvanometer
The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately . Find the distance from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that ea..
A 250, 35-cm-diameter turntable rotates on frictionless bearings at 60. A 25 block sits at the center of the turntable. A compressed spring shoots the block thoroughly outward next to a frictionless groove in the surface of the turntable.
The output voltage of an AC generator is given by ?v = (190 V) sin (70?t). The generator is connected across a 12.0-? resistor. Find the power delivered to the resistor
A double concanve lens has equal radii of curvature 15.1 cm. What is the index of refraction of the lens material
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