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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:Suppose that 4 J of work is needed to stretch a spring from its natural length of 36 cm to a length of 46 cm.
(a) How much work (in J) is needed to stretch the spring from 40 cm to 44 cm? (Round your answer to two decimal places.)
1.28
X J
(b) How far beyond its natural length (in cm) will a force of 25 N keep the spring stretched? (Round your answer one decimal place.)
1000
x cm
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- A tank in the shape of a hemispherical bowl of radius 4 m is completely filled with water. How much work is required to pump all the water to a height 5 m above the tank? (The density of water is 1000 kg/m3 .Assume g = 9.8 m/s2) Answer in exact form and decimal.arrow_forwardA car of 850 kg drives at a constant speed of 20 m/s (appromately 45 mph). It is subject to a combination of friction and drag force of 420 N. What power is required from the car's engine to drive the car on level ground, in kW (kiloWatts)? Use g = 10 m/s2. Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forwardA vertical right-circular cylindrical tank measures 28 ft high and 14 ft in diameter. It is full of liquid weighing 62.4 lb/ft³. How much work does it take to pump the liquid to the level of the top of the tank? Set up the integral that gives the work required, in ft-lb, with y = 0 corresponding to the bottom of the tank. (Type an exact answer, using as needed.)arrow_forward
- Suppose that 6J of work is needed to stretch a spring from its natural length of 28 cm to a length of 40 cm. (a) How much work is needed to stretch the spring from 33 cm to 38 cm? (Round your answer to two decimal places.) 1.2 (b) How far beyond its natural length will a force of 2ON keep the spring stretched? (Round your answer one decimal place.) 7.5 cm Need Help? Watch Itarrow_forwardA ball with a mass of 2.20 kg is moving with velocity (5.60î – 1.20j) m/s. (HINT: v2 = v. v.) (a) What is the ball's kinetic energy (in J) at this velocity? (b) Find the net work (in J) on the ball if its velocity changes to (8.00î + 4.00j) m/s.arrow_forwardIf 54 J of work is needed to stretch a spring from 16 cm to 22 cm and another 90 J is needed to stretch it from 22 cm to 28 cm, what is the natural length (in cm) of the spring? cmarrow_forward
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