- A 60 kg sledder starts at the top of a 52 meter hill. square square square square square square square square square square square square square square square square square square square square square square square square square square square How much potential energy does the sledder have at the top of the hill? 11.3J 30,576 J 3,120 J 1.15J
- A 500 kg roller coaster car reaches the top of the second hill, 80 meters above the ground. How much potential energy does the roller coaster car have at the second hill? 392,0 oo J 4,082 J 40,00 o J 61.25 J
- EX. 3: A 250 kg box slides down a ramp and then across a level floor The coefficient of kinetic friction along the floor is 0.20. A person sees the a box moving at 1.0m/s[left] and pushes on it with a horizontal force of 140 N [right]. a. How far does the box travel before coming to rest? b. How will the results change if the box is moving right and the person still pushes right with the same force?
- Word Problems: Remember to use GRASP and show string number before stating final answer. 1) Bats produce ultrasounds of approximately 3.0times 10^4Hz If the time for the echo to return from a moth is 4.6times 10^-2s how many wavelengths are there between the bat and the moth? Assume a sound speed of 340m/s. [Ans: 690] 2) Alightning flash is seen 8.0 s before the rumble of the thunder is heard. Find the distance to the lightning flash if the temperature is 21^circ C [Ans: 2800 m] 3) Asiren of frequency 512 Hz sounds 450 m away. The air temperature is 32^circ C (a) What is the speed of the sound of the siren? [Ans: 350m/s)
- Word Problems: Remember to use GRASP and show string number before stating final answer. 1) Bats produce ultrasounds of approximately 3.0times 10^4Hz If the time for the echo to return from a moth is 4.6times 10^-2s how many wavelengths are there between the bat and the moth? Assume a sound spoed of 340m/s. [Ans: 690] 2) A lightning flash is seen 8.0 s before the rumble of the thunder is heard. Find the distance to the lightning flash if the temperature is 21^circ C [Ans: 2800 m]
