zxing qr code reader java You slide a crate up a ramp at an angle of 300 by in Objective-C

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64 You slide a crate up a ramp at an angle of 300 by
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exerting a 225-N force parallel to the ramp The crate moves at a constant speed The coefficient of friction is 028 How much work did you do on the crate as it was raised a vertical distance of 115 m
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0 kg 20 m
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piano is to be slid up a 35-m frictionless plank at a constant speed The plank makes an angle of 300 with the horizontal Calculate the work done by the person sliding the piano up the plank
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10 Assessment
71 Boat Engine An engine moves a boat through the
water at a constant speed of 15 m/s The engine must exert a force of 60 kN to balance the force that the water exerts against the hull What power does the engine develop
75 Oil Pump In 350 s, a pump delivers 0550 m3
of oil into barrels on a platform 250 m above the intake pipe The oil s density is 0820 g/cm3 a Calculate the work done by the pump b Calculate the power produced by the pump
72 In Figure 10-20, the magnitude of the force
necessary to stretch a spring is plotted against the distance the spring is stretched a Calculate the slope of the graph, k, and show that F kd, where k 25 N/m b Find the amount of work done in stretching the spring from 000 m to 020 m by calculating the area under the graph from 000 m to 020 m c Show that the answer to part b can be calculated using the formula W 1 kd2, where W is the 2 work, k 25 N/m (the slope of the graph), and d is the distance the spring is stretched (020 m)
76 Conveyor Belt A 120-m-long conveyor belt,
inclined at 300 , is used to transport bundles of newspapers from the mail room up to the cargo bay to be loaded onto delivery trucks Each newspaper has a mass of 10 kg, and there are 25 newspapers per bundle Determine the power that the conveyor develops if it delivers 15 bundles per minute
77 A car is driven at a constant speed of 76 km/h down
a road The car s engine delivers 48 kW of power Calculate the average force that is resisting the motion of the car
78 The graph in Figure 10-22 shows the force and
800 Force (N) 600 400 200 000
displacement of an object being pulled a Calculate the work done to pull the object 70 m b Calculate the power that would be developed if the work was done in 20 s
Figure 10-20
Elongation (m)
Force (N)
73 Use the graph in Figure 10-20 to find the work
needed to stretch the spring from 012 m to 028 m
74 A worker pushes a crate weighing 93 N up an inclined
plane The worker pushes the crate horizontally, parallel to the ground, as illustrated in Figure 10-21 a The worker exerts a force of 85 N How much work does he do b How much work is done by gravity (Be careful with the signs you use) c The coefficient of friction is 020 How much work is done by friction (Be careful with the signs you use)
60 Figure 10-22
Displacement (m)
102 Machines
79 Piano Takeshi raises a 1200-N piano a distance of
500 m using a set of pulleys He pulls in 200 m of rope a How much effort force would Takeshi apply if this were an ideal machine b What force is used to balance the friction force if the actual effort is 340 N c What is the output work d What is the input work e What is the mechanical advantage
85 N
5 0 m
30 m
40 m
80 Lever Because there is very little friction, the lever is
an extremely efficient simple machine Using a 900percent-efficient lever, what input work is required to lift an 180-kg mass through a distance of 050 m
For more problems, go to Additional Problems, Appendix B
Figure 10-21
93 N
10 Energy, Work, and Simple Machines
81 A pulley system lifts a 1345-N weight a distance of
0975 m Paul pulls the rope a distance of 390 m, exerting a force of 375 N a What is the ideal mechanical advantage of the system b What is the mechanical advantage c How efficient is the system
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