University:
Eastern Kentucky University
Course:
PHY 131 | College Physics I
Academic year:

2022
Views:

80

Pages:

1
Author:

zbrkanogiorr

At what speed does a 1800 kg compact car have the same kinetic energy as a 15000 kg truck going 25 km/h ? A 1400 kg wrecking ball hangs from a 10-m-long cable. The ball is pulled back until the cable makes an angle of 20.0 : with the vertical. By how much has the gravitational potential energy of the ball changed? Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride. If a boat and its riders have a mass of 1000 kg and the boat drifts in at 1.2 m/s how much work does Sam do to stop it? An elite Tour de France cyclist can maintain an output power of 470 W during a sustained climb. At this output power, how long would it take an 81 kg cyclist (including the mass of his bike) to climb the famed 1100- m -high Alpe d'Huez mountain stage? Neglect any friction. A woman uses a pulley and a rope to raise a 24 kg weight to a height of 3 m . If it takes 4 s to do this, about how much power is she supplying? A 710 kg car drives at a constant speed of 23 m/s . It is subject to a drag force of 500 N. What power is required from the car's engine to What power is required from the car's engine to drive the car on level ground? drive the car up a hill with a slope of 2.0 : ? A water boy carries a 13 kg cooler up a flight of stadium stairs 17 m tall. The cooler starts and ends at rest. If the water boy starts halfway up the stairs, calculate the change in gravitational potential energy. Calculate the work done by the force due to gravity. A 832 kg rocket sled is coasting at 30 m/s . It then turns on its rocket engines for 100 m , with a thrust of 2000 N in the same direction as displacement. What is its final velocity?