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Two blocks are connected with a rope that passes of a set of pulleys. One block weighs 412 Newton’s, and the other weighs 908 Newton’s. The rope and the pulleys have no mass or friction. (a) What is the acceleration of the lighter block? (b) If the heavier block is removed and a downward force of 908 Newton’s is supplied by a man pulling on the rope, what is the acceleration of the 412 Newton block? Why are the answers to (a) and (b) dissimilar? Topic: Forces and Newton’s laws of motion.
A transformer takes 120V (RMS) from a household circuit and drops it to supply a secondary circuit at 8V (RMS) to power a dorbell at 3.75A (RMS). What is the peak current in the primary coil of the transformer
A sample of an unknown material appears to weigh 255 N in air and 195 N when immersed in alcohol of specific gravity 0.700. What is the volume of the material
Two boats start together and race across a 46 km wide lake and back. Boat A goes across at 44 km/h and returns at 48 km/h. Boat B goes across at 27 km/h, and its crew, realizing how far behind it is getting, returns at 69 km/h. Turnaround times are n..
A 1,220-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 9,500-kg truck moving in the same direction at 20.0 m/s, how much mechanical energy is lost after the collision
A bat strikes a 0.145 kilogram baseball. Just before impact, the ball is traveling horizontally to the right at 44.0 m/s, obtain the vertical and horizontal components of the average force on ball
A thin rod consists of two parts joined together. One-third of it is silver and two-thirds is gold. The temperature decreases by 31.7 C°. Determine the fractional decrease ?L/(LSilver + LGold) in the rod's length, where LSilver and LGold are the init..
You need a transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. What is the effective resistance of the secondary circuit
The greatest ocean depths on earth are found in the Marianas Trench near the Philippines, where the depth of the bottom of the trench is about 11.0 km. Calculate the pressure due to the ocean at a depth of 9.5 km
An airplane with a speed of 77.1 m/s is climbing upward at an angle of 70.4 ° with respect to the horizontal. When the plane's altitude is 861 m, Calculate the distance along the ground
Two balls on a pool table collide. The balls have each a mass of 35grs and the collision can be considered elastic and in 1 dimension. If ball 1 is moving at 3 m/s to the right while ball 2 is moving at 1 m/s to the left, what are the final velocit..
A 3.0-kg cylinder falls vertically from rest in a very tall, evacuated tube 20m above the surface of the earth. what is its kinetic energy just before it hits the earth
One of the most efficient engines ever built is a coal-fired steamturbine in the Ohio valley, driving an electric generator as itoperates between 1870°C and 430°C. What is its maximum theoretical efficiency
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