1. A 75kg athlete runs up a hill that is 55.Om high. How much work is...
A runner is training for a race by running up a hill. The 80kg racer runs a 40m path to reach a height of 5m above where they started (see diagram below). Their legs put in a consistent force of 320N for the entire distance a) How much potential energy did the runner gain? (2 marks) b) How much energy was put into the system (2 marks) c) If the run took 14 seconds, what is the power rating of...
A runner is training for a race by running up a hill. The 85kg racer runs a 40m path to reach a height of 5m above where they started (see diagram below). Their legs put in a consistent force of 320N for the entire distance a) How much potential energy did the runner gain? (2 marks) b) How much energy was put into the system (2 marks) c) If the run took 15 seconds, what is the power rating of...
A bear of mass 218 kg runs up a hill. At the top of the hill, she donr 23.5 kj of work. How high is the hill?
a) How high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 78.0 km/h? m (b) If, in actuality, a 750 kg car with an initial speed of 78.0 km/h is observed to coast up a hill to a height 10.0 m above its starting point, how much thermal energy was generated by friction? J (c) What is the average force of friction if the hill has a slope 2.5° above...
a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings
As part of her morning jog, a 65-kg woman runs up a flight of steps with a vertical height of 10 meters. She accomplishes this task in 15.0 seconds. a) What is the weight of the woman? b) How much work did the woman use to climb the stairs? c) What is her increase in potential energy? d) How much power did she use to climb the stairs? e) How much horsepower did she use?
5. A load of 4 slugs is attached to a rope that runs over a pulley at the top of a building 100 ft. high. If a man is able to raise this load to the top of the building in 1 min, find the average power (in watt) required. 6, A 4,000 # car is at an incline that makes an angle of 15° with the horizontal. It is moving upward at constant speed 60 mph against a frictional...
(1 point) The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). The mean maximum oxygen uptake for elite athletes has been found to be 80 with a standard deviation of 6.1. Assume that the distribution is approximately normal. (a) What is the probability that an elite athlete has a maximum oxygen uptake of at least 50 ml/kg? answer: (b) What is the probability that...
A 40-kg pack is carried up a 2500-m-high mountain in 10.0 h. How much work is done?
A 52 kg sprinter, starting from rest, runs 60 m in 7.1 s with a constant acceleration. How much work does the sprinter do during the final 2.0 s of his run? What is the sprinter's average power output during the final 2.0 s ?