A farmhand lifts a 23.5-kg bale of hay to a height H = 1.1 m to get it into the back of a flatbed truck. How many bales ofhay can the farmhand lift using the energy provided by a thick, rich, 485-C chocolate milkshake?
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A farmhand lifts a 23.5-kg bale of hay to a height H = 1.1 m to get it into the back of a flatbed truck. How many bales of
hay can the farmhand lift using the energy provided by a thick, rich, 485-C chocolate milkshake?
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- 7. A crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20.0° T with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 5.00 m. (a) How much work is done by the gravitational force on the crate? (b) Determine the increase in internal energy of the crate- incline system owing to friction. (c) How much work is done by the 100-N force on the crate? (d) What is the change in kinetic energy of the crate? (e) What is the speed of the crate after being pulled 5.00 m?On a playground slide, a child has potential energy PE = 450.0 J at the top of the slide. Thechild’s mass is 25.0 kg. (For simplicity, take the value of g to be 10.0 m/s2 in this problem.) When the child slides down to the bottom of the slide, her KE = 300.0 J. a) What was the height of the slide?b) How much was the work done by friction?c) How fast was the child moving when she reached the middle of the slide? (Assume that thework done by friction is half of what you get in (b). Note that the PE2 is not zero this time.)A 4 kg block is initially sliding up a 30° incline at 6 m/s. It slides 3 m along the surface before coming to rest. Gravity did ____ J of work on the block during this segment of motion. A 4 kg block is initially sliding up a 30° incline at 6 m/s. It slides 3 m along the surface before coming to rest. Kinetic friction did ____ J of work on the block during this segment of motion.