
A 63.3-kg firefighter climbs a flight of stairs 28.7-m high. How much work (in J) does...
A 70.0 kg firefighter climbs a flight of stairs 9.0 m high. How much work is required?
A student weighing 200 N climbs a flight of stairs 9.0 m high in 4 s. What power is required to perform this task?
A 7356 kg man climbs 20 stairs. Each stair has a height of 0.2 m. He completes this task in 8 seconds. Calculate A) the external mechanical work, B) the average power, c) the change in potential energy
12 A 60.0-kg woman who runs up a 3.00 m high flight of stairs in 3.50 s, starting from rest but having a final speed of 2.00 m/s? What is the final potential energy. A) 126 J B) 110W C) 153 J D) 120 J E) 140 J 13 A 100 g ball move upward with a velocity of 10 m/s from ground level in a free fall movement. What is the kinetic energy for the ball at ground level?
A 59.5 kg woman starts from rest at the bottom of a flight of stairs that has a total height of 2.8 meters. She reaches the top of the stairs in 4.53 seconds. How much power does she generate in Watts if she is moving at 1.91 m/s at the top of the stairs and her body has an efficiency of 27.2%? Assume 3 significant figures in your answer.
Name Date 9-10) A 165 pound student grudgingly climbs one flight of stairs (4.32 m) in a time of 15.50 seconds to make it to a physics test. How much work has the student done in climbing steps, and what is the student's average power output? (4.45 N 1 lb) Work Power = 11-12) A collision occurred between 2 carts. Use the data below to complete the charts. Mass of cart 1 Mass of cart 2 Velocity of cart 2...
A young boy, named Harry, climbs to the top of a 20.0-meter-high water slide at an amusement park. Harry weighs 450.0 N. You can neglect friction when Harry slides down the water slide because of the water that flows down with him. Assume that it takes Harry an average of 45 seconds to climb the stairs that lead to the top of the water slide and about 5.5 seconds to slide down the slope of the water slide. What is...
1a) How much work is required for a 60 kg person to climb the stairs near the entrance of Science 2 from the first floor to the second floor? The incline angle of the stairs is 30°, and the total height is 3.5 m. b) Suppose the same person decides to take the steeper staircase (incline ~ 35°) in the corner of the building instead. Would the work necessary to ascend to the second floor be greater, smaller, or the...
6.5 A 75.0-kg painter climbs a ladder that is 2.75 m long leaning against a vertical wall. The ladder makes a 30.0 degree angle with the wall. (a) How much work does gravity do on the painter? (b) Does the answer to part (a) depend on whether the painter climbs at constant speed or accelerates up the ladder?
a 65-kg man goes on a hike and climbs 110m high hill. (a) What is the increase in the gravitational potential energy of the man? (b) Where does this energy come from? (c) The man's body is 20 percent efficient; that is, for every 20 J that are converted to mechnical energy, 100 J of chemical energy are expended, with 80 J going into thermal energy. How much chemical energy is expended by the man during the climb?