Calculate the work done in lifting a 520-NN barbell 1.8 mm above the floor. Express your answer to two significant figures and include the appropriate units.
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A: Mass = m = 200 kg Height = h= 1.25m
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A: Given, Mass, m= 10 kg, height, h= 18m, and friction coefficient, μ=0.3.
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A: Given data: Mass (m) = 200 kg Height (h) = 1.25 m Required: Force (F)
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A: Given: μ = 0.3mass of block (m) = 10 Kgheight (h) = 18 mcos(53) = 3/5 = 0.6sin(53) = 4/5 = 0.8…
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Q: In the figure, two identical springs have unstretched lengths of 0.26 m and spring constants of 261…
A: Solution: Given that spring constant k = 261 N/m unstretched lengths of 0.26 m
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- A solid cone with height 9 m and base with radius 2.7 m is built using a lightweight material whose density is 600 m³ gravity: the required work is Constructing this cone requires work against (include units in your answer and write "pi" [without quotes] to enter π).of a copper wire of uniform cross section and Ex. 70: find the energy stored per unit volume of length 1.5 m, when it is stretched to a length of a copper wire of uniform cross section and of length 1.5 m, when it is stretched to length a of 1.51 m by a stress of 3 x 102 N/m2.A ladder 2.00 m long, weighing 234 N, initially lies flat on the ground The ladder is raised to a vertical position Compute the work done by the force lifting the ladder. The ladder's center of gravity is at it geometric center?
- A high jumper, falling at 4.0 m/s, lands on a foam pit and comes to rest, compressing the pit 0.40 m. If thepit is able to exert an average force of 1200 N on the high jumper in breaking the fall, what is the jumper'smass? (60 kg)Truck suspenslons often have "helper springs" that engage at high loads. One such arrangement is a leaf spring with a helper colil spring mounted on the axle, as shown in the figure below. When the main leaf spring is compressed by distance the helper spring engages and then helps to support any additional load. Suppose the leaf spring constant is Yo 4.75 x 105 N/m, the helper spring constant is 3.40 x 105 N/m, and y 0.500 m. Truck body Main leaf spring Helper" spring Axle (0) What is the compression of the leaf spring for a load of 4.90 x 10 N? Your response differs from the correct answer by more than 10%. Double check your calculations. m (b) How much work is done in compressing the springs?A 170-lb man carries a 20-lb can of paint up a helical staircase that encircles a silo with radius 30 ft. If the silo is 120 ft high and the man makes exactly four complete revolutions, how much work is done by the man against gravity in climbing to the top? Answer in ft-lbs.
- The rectangular tank shown here, with its top at ground level, is used to catch runoff water. Assume that the water weighs 62.4 Ib / ft 18 f 13 ft Ground level ol a. How much work does it take to empty the tank by pumping the water back to ground level once the tank is full? b. If the water is pumped to ground level with a (10/11)-horsepower (hp) motor (work output 500 ft-lb/sec), how long will it take to empty the tank (to the nearest minute)? c. Show that the pump in part (b) will lower the water level 15 ft (halfway) during the first 55 minutes of pumping. d. What are the answers to parts (a) and (b) in a location where water weighs 62.28 lb / ft? 62.61 Ib/ ft? 3025. A pen contains a spring with a spring constant of 250 N/m. When the tip of the pen is in its retracted position, the spring is compressed 5.0 mm from its unstrained length. In order to push the tip out and lock it into its writing position, the spring must be compressed an additional 6.0 mm. How much work is done by the spring force to ready the pen for writing? Be sure to include the proper algebraic sign with your answer.A soap bubble is blown to a diameter of 7cm . If 36960 erg of work is done in blowing it furthur , find the new radius if the surface tension of soap solution is 40dyne/cm.
- A swift blow with the hand can break a pine board. As the hand hits the board, the kinetic energy of the hand is transformed into elastic potential energy of the bending board; if the board bends far enough, it breaks. Applying a force to the center of a particular pine board deflects the center of the board by a distance that increases in proportion to the force.Ultimately the board breaks at an applied force of 800 N and a deflection of 1.2 cm.a. To break the board with a blow from the hand, how fast must the hand be moving? Use 0.50 kg for the mass of the hand.b. If the hand is moving this fast and comes to rest in a distance of 1.2 cm, what is the average force on the hand?The block has a mass of 143 kg and rests on a surface for which the coefficients of static and kinetic friction are μ = 0.5 and μ = 0.4, respectively. (Figure 1) FigureA 190-lb man carries a 5-lb can of paint up a helical staircase that encircles a silo with radius 25 ft. If the silo is 160 ft high and the man makes exactly four complete revolutions, how much work is done by the man against gravity in climbing to the top? ft-lbs