A bicyclist plus his bike weighs 80 kg. For the length of a 2-mile long hill, the bicyclist can do 250 W of useful work. How long will it take him to ride uphill given that the hill is inclined at 4 degrees?
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- Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a ? = 62.0° slope at constant speed, as shown in the figure. How much work is done (in J) by friction as the sled moves 30.0 m along the hill? How much work is done (in J) by the rope on the sled in this distance? What is the work done (in J) by gravity on the sled? What is the total work done (in J)?Show the fbd/figure, given and formula used. A factory worker pushes a 40 kg box a distance of 5 meter along a level floor, at constant speed, by pushing horizontally on it. The coefficient of friction between the box and the floor is 0.25. What force is required? How much work does the man do?I need help on this question?
- A force of 17 Ib is required to hold a spring stretched 3 in. beyond its natural length. How much work W is done in stretching it from its natural length to 9 in. beyond its natural length?A helicopter lifts a 85 kg astronaut 13 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed?A helicopter lifts a 65 kg astronaut 18 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? (b) How much work is done on the astronaut by her weight? (c) What is the kinetic energy? (d) What is the speed of the astronaut just before she reaches the helicopter? m/s
- A man pulls a 4.6-kg sled 50 meters along an angled hill with a force of 36 N, which elevates the man 28 meters above the bottom of the hill. The man then hops on his sled and slides from rest to the bottom of the hill back along his 50 meter path, during which a 299 N frictional force acts upon his sled. How much work in Joules does the man do against friction in pulling the sled up the hill?A man pushes a 85.9-N crate a distance of 3.7 m up a long frictionless ramp at a constant speed. His pushing force is parallel to the ramp. The ramp makes a 30.0-degree angle with the horizontal. What is the work done by the man in pushing the crate? Give your answer in joules, rounded to one decimal place.A 4.5-kg block slides down a frictionless incline making an angle of 55.0° with the horizontal. (a) What is the total work done on the block when the block slides 1.4 m (measured along the incline)? (b) What is the speed of the block after it has slid 1.2 m if it starts from rest? m/s (c) What is its speed after 1.2 m if it starts with an initial speed of 1.6 m/s? m/s You can use the definition of work as the scalar product of a constant force and displacement to find the work done by each force acting on the block. Then use the work- kinetic energy theorem the find the speed of the block at any given location and for any initial kinetic energy it may have.
- A bicyclist starting from rest applies a force of F = 239 N to ride his bicycle across flat ground for a distance of d = 210 m before encountering a hill making an angle of θ = 17 degrees with respect to the horizontal. The bicycle and rider have a mass of m = 120 kg combined. In this problem, you can ignore air resistance and other losses due to friction.How much work, W in joules, did the rider do before reaching the hill? What is the bicycle's speed, v in m/s, just before the hill? If the cyclist starts coasting at the bottom of the hill, what distance, di in meters, does the bike travel up the incline?A cat's crinkle ball toy of mass 28 g is thrown straight up with an initial speed of 5 m/s. Assume in this problem that air drag is negligible. (a) What is the kinetic energy of the ball (in J) as it leaves the hand? (b) How much work is done (in J) by the gravitational force during the ball's rise to its peak? (c) What is the change in the gravitational potential energy of the ball (in J) during the rise to its peak? (d) If the gravitational potential energy is taken to be zero at the point where it leaves your hand, what is the gravitational potential energy (in J) when it reaches the maximum height? (e) If the gravitational potential energy is taken to be zero at the maximum height the ball reaches, what would the gravitational potential energy (in J) be when it leaves the hand? (f) What is the maximum height the ball reaches (in m)? mA 600 N person climbs a ladder at a constant speed. The person climbs up 12 meters in a time of 20 seconds. What is the work done and the power exerted?