Please show the work I have the solutions! 11. A car drives around a flat circul
ID: 581447 • Letter: P
Question
Please show the work I have the solutions!
11. A car drives around a flat circular curve with radius 20 meters. If s = 0.845 find the maximum speed the car can take the curve without flying off the road.
12.You are designing a roller coaster and want to make a hill with radius 10 meters. At what speed will the riders feel weightless at the top? Hint: you feel weightless when you have no normal force.
13. A lifeguard friend wants to horizontally twirl his keys on a string over his head with a period of 1 rev/sec. If his string will break at a force of 10N and his keys have mass 200g, how long can the string be?
How much work does the string do on the keys in 1 revolution?
14. Brick A sits on Brick B. Brick B sits on a flat frictionless surface. A large constant force is applied to B. What is the largest magnitude of acceleration of Brick A? Between bricks there is friction with s = 0.75 and k = 0.5.
15. A moving car starts to brake and skids to a stop in 10m on a surface with k = 0.6. How fast was the car going?
16. For what value of M2 will the masses remain stationary? Assume there is no friction. M1 is 10kg and =60°
17. For what values of M2 will the masses remain stationary? Assume us = 0.6
M1 is 10kg and =60°
18. Find the ration of M2 to M1 which keeps the masses stationary when =30° Assume there is no friction.
Explanation / Answer
Please post other questions separately. Here is the answer to question#11
question#11
vmax = (sgr)1/2
vmax = (0.845 * 9.8 * 20)1/2
vmax = 12.87 m/s