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Two wires are the same diameter but wire A is three times the length of wire B. What is the ratio of the heat produced in A to that produced in B if the same potential is placed across the ends of the two wires? Show your calculations.
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Question: A rock thrown with speed 10.5 and launch angle 30.0(above the horizontal) travels a horizontal distance of = 18.0before hitting the ground. From what height was the rock thrown? Use the value = 9.810 for the fr ...
Question: A skier is accelerating down a 30.0 degree hill at 1.80 m/s2. What is the vertical component of her acceleration? How long will it take her to reach the bottom of the hill, assuming she starts from rest and acc ...
Question: A quarterback is set up to throw the football to a receiver who is running with a constant velocity v? r directly away from the quarterback and is now a distance D away from the quarterback. The quarterback fig ...
An observer sees an airplane flying directly overhead and determines that the distance from the wingtip to wingtip subtends and angle of 0.0080 radians. She knows that the wingspan of the airplane is actually 160 feet. W ...
Question: a) What is the potential difference V ad in thecircuit? b) What is the terminal voltage of the 4V battery? c) A battery with emf 10.3V and internal resistance .5ohm isinserted in the circuit d with its negativ ...
Question: The starter motor of a car engine draws a current of 170 A from the battery. The copper wire to the motor is 5.80 mm in diameter and 1.2 m long. The starter motor runs for 0.670 s until the car engine starts. A ...
Question: A rifle with a barrel length of 59cm fires a 8g bullet with a horizontal speed of 430m/s . The bullet strikes a block of wood and penetrates to a depth of 15cm. A) What resistive force (assumed to be constant) ...
Question: A pendulum has a period of 1.77 s on Earth. Part A: What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth? Express your answer to two significant figures and include the appr ...
Question: A radar used to detect the presence of aircraft receives a pulse that has reflected off an object 8.5*10^-5 s after it was transmitted. t = 8.5*10^-5 s 1. What is the distance in m from the radar station to the ...
Question: A thin stream of water flows vertically downward. The stream bends toward a positively charged object when it is placed near it. The positively charged object is then removed. What will happen to the same strea ...
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