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a wire of length L has a resistance R if it is cut into three equal lengths that are placed side by side and tightly twisted together, what is the equivalent resistance of the twisted wires?
A 70 g metal block moving at 200 cm/s slides across a tabletop a distance of 83 cm before it comes to rest. how much does the temperature of the block rise
The bullet penetrates into the block and stops due to its friction with the block. The compound system of the block plus the bullet rises to a height of 11 cm along a circular arc with a 20 cm radius A bullet with a m1 = 30.0 g mass is fired horizont..
A tennis player swings her 1000g racket with a speed of 11m/s, If the tennis ball and racket are in contact for 12ms, find the average force that the racket exerts on the ball
Two adjacent natural frequencies of an organ pipe are determined to be 986 Hz and 870 Hz. (Assume the speed of sound is 343 m/s.), Calculate the fundamental frequency of this pipe
A cylinder of mass 14.0 kg rolls without slipping on a horizontal surface. find the rotational kinetic energy about its center of mass
A bug that has a mass mb = 3 g walks from the center to the edge of a disk that is freely turning at 20 rpm. The disk has a mass of md = 13 g. what is the new rate of spinning in rpm
You are driving a car which is heading 20 m/s towards a brick wall. You sound a horn which emits at a frequency of 400 Hz when at rest. What is the beat frequency that you hear
A parallel-sided plate of glass having a refractive index of 1.58 is in contact with the surface of water in a tank. What angle does this ray make with the normal in the water
Which of following statements is correct
using a rope, a child pulls a box across a rough floor at constant speed. The tension in the rope is 105 N and the rope makes an angle of 37 with the horizontal. Find the friction force acting on the box
The working substance of an engine is 1.00 mol of diatomic gas. The engine operates in a cycle consisting of three steps, Find the efficiency of this cycle
The observed frequency of a train whistle is 475Hz as it approaches a stationary observer and is 410Hz as it recedes
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