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A 0.95-m aluminium bar is held with its length parallel to the east-west direction and dropped from a bridge. Now before the bar hits the river below, its speed is 25 m/s, and the emf induced across its length is 7.5 x 10-4 V. Assuming the horizontal component of the Earth's magnetic field at the location of the bar points directly north, (a) Decide the magnitude of the horizontal component of the Earth's magnetic field, and (b) state the number of which end of the bar is positive: 1 = east, 2 = west.
A 4.0-m-long iron bar of uniform cross section is held perpendicular to the wall by a wire from the end of the bar to the wall. What is the tension in the wire
A rectangular block of copper has sides of length 5 cm, 21 cm, and 38 cm. what are the currents that the block can carry
A mass of 5. 0 Kg is resting on a horizontal, frictionless surface. If the system is released from rest with the spring in its relaxed state, what is the maximum extension of the spring
A 0.03 kg bullet hits asteel plate and melts and splatters on impact. Assuming thatthe bullet recieves 80% of the collision energy, at what minimium speed must it travel to melt on impact?
A golf ball is released from rest from a height of 0.759 m above the ground and has a collision with the ground, What is the maximum height reached by this ball as it bounces back up after this collision
A Galaxy is moving away from us with a speed of 3 x 10^7 m s^-1. What is the frequency of the light we would observe if it is emitted at 6 x 10^14 Hz
occasionally an asteroid is broken up into smaller pieces or fragments. these fragments hurl through space and some of
(a) What is the velocity of the boat at t = 18.89 s? (b) Find the total displacement of the boat.
A 1486-kg car is moving westward with a speed of 20.3 m/s, and a 2898-kg truck is traveling east with a speed of 17.8 m/s. Find the velocity of the center of mass of the car-truck system
A car decelerates uniformly and comes to a stop after 10s. The car's velocity was 50 km/h. What was the car's deceleration
The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. Explain how high does the top of the ice block float above the water level?
A light beam is traveling through an unknown substance. When it exits that substance and goes into air, What is the index of refraction of the substance
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