A body of mass 2 kg was dropped down from a height. If the KE attained by it is 400 J, find the height from which it was dropped.
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- A spring has a natural length of 40 cm (or 0.40m). If a 60-N force is required to keep the spring compress to 10 cm, (a) how much work is done during the compression? (b) how much work is needed to compress the spring to a length of 25 cm?If, in actuality, a 750-kg car with an initial speed of 116 km/h is observed to coast up a hill and stops at a height 24.5 m above its starting point, how much thermal energy was generated by friction in J?A 7.8 kg box is pushed sideways with a force whose magnitude is 353 N. When the box has slid 0.2 m, how much work (in joules) did the push do?
- (a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force F at an angle e with respect to the horizontal. The coefficient of kinetic friction between block and table is u. Is the force exerted by friction equal to u, mg? If not, what is the force exerted by friction? (Assume 0 is measured above the horizontal.) This answer has not been graded yet. (b) How much work is done by the friction force and by F? (Don't forget the signs. Use the following as necessary: F for the magnitude of F, g, m, x, 0 and u,) WE = (c) Identify all the forces that do no work on the block. (Select all that apply.) O friction f OF Cos(e) OF sin(0) O mE (d) Let m = 2.00 kg, x = 4.50 m, 0 = 3.7°, F = 14.5 N, and u, = 0.400, and find the answers to parts (a) and (b). (Include appropriate signs.) We = W =A person drops a brick from the top of a building. The height of the building is 400.0 m and the mass of the brick is 1.70 kg. (a) Calculate the potential energy (in J) at the top of the building. J (b) Calculate the speed of the brick right before it touches the ground. m/sA box with a mass of 3.0 kg is accelerated from rest by a constant force across a floor at a rate of 1.7 m/s for6.5 s.(a) How much work does the force do on the box?(b) How much power is produced by the force in moving the box?
- A child pulls a sled upon snow covered hill. The child dose 315 J of work on the sled . If child walks 15 m up the hill , how large a force must child exert ?Calculate the work done (in J) on a 1550 kg elevator car by its cable to lift it 37.5 m at a constant speed, assuming friction averages 115 N. What is the total work done (in J) on the lift?A hydroelectric power facility converts the gravitational potential energy of water behind a dam to electric energy. (For each answer, enter a number.) (a) What is the gravitational potential energy (in J) relative to the generators of a lake of volume 38.0 km3 (mass = 3.80 ✕ 1013 kg), given that the lake has an average height of 42.0 m above the generators? ?J (b) Compare this with the energy stored in a 9-megaton fusion bomb. Elake/Ebomb =
- A spring has natural length 24 cm. Compare the work (in J) W1 done in stretching the spring from 24 cm to 34 cm with the work (in J) W2 done in stretching it from 34 cm to 44 cm. (Use k for the spring constant.)The speed of a crate traveling on a horizontal frictional surface changes from vi=13 m/s to vf=11.5 m/s in a distance of d=8.5 m. (A) how long in seconds did it take for the crate to slow by this amount, assuming the acceleration is constant? (B) if the crate has a mass of 1kg, what is the power supplied to the crate by friction? (C) what is the coefficient of kinetic friction between the crate and the surface uk?A 1000-kg automobile accelerates up a hill, increasing its speed from 5 mi/h to 50 mi/h, along a straight 100-m stretch of road. If the hill makes an angle of 5° with respect to the horizontal, find the total work done by the automobile.