QUESTION 11 What minimum velocity must a small roller-coaster car have at the bottom of a frictionless, circular, loop-the loop track of radius 8.00 m in order to make it over the top without falling off the track? Neglect wind resistance. 19.8 m/s 11.0 m/s 8.20 m/s 14.3 m/s 15.1 m/s a. 8.20 m/s b. 11.0 m/s OC. 15.1 m/s Od. 14.3 m/s e. 19.8 m/s

QUESTION 11 What minimum velocity must a small roller-coaster car have at the bottom of a frictionless, circular, loop-the loop track of radius 8.00 m in order to make it over the top without falling off the track? Neglect wind resistance. 19.8 m/s 11.0 m/s 8.20 m/s 14.3 m/s 15.1 m/s a. 8.20 m/s b. 11.0 m/s OC. 15.1 m/s Od. 14.3 m/s e. 19.8 m/s

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter7: Rotational Motion And Gravitation

Section: Chapter Questions

Problem 56AP: Keratinocytes are the most common cells in the skins outer layer. As these approximately circular...

See similar textbooks

Similar questions

Keratinocytes are the most common cells in the skins outer layer. As these approximately circular cells migrate across a wound during the healing process, they roll in a way that reduces the frictional forces impeding their motion. (a) Given a cell body diameter of 1.00 105 m (10 m), what minimum angular speed would be required to produce the observed linear speed of 1.67 107 m/s (10 m/min)? (b) How many complete revolutions would be required for the cell to roll a distance of 5.00 103 m? (Because of slipping as the cells roll, averages of observed angular speeds and the number of complete revolutions are about three times these minimum values.)
A gymnast does cartwheels along the floor and then launches herself into the air and executes several flips in a tuck while she is airborne. If her moment of inertia when executing the cartwheels is 13.5kgm2 and her spin rate is 0.5 rev/s, how many revolutions does she do in the air if her moment of inertia in the tuck is 3.4kgm2 and she has 2.0 s to do the flips in the air?
1) A boy releases his 2.0 kg toy, from rest, at the top of a sliding-pond inclined at 20o above the horizontal. What will the toy's speed be after sliding 4.0 m along the sliding-pond? The coefficient of kinetic friction is 0.20. 2) A race car, traveling at a constant speed of 50 m/s, drives around a circular track of radius 250 m. What angular acceleration does it experience?
m= 3kg l= 1 m being spun vertically w/ uniform speed, v= 4m/s
A 50.0-kg child stands at the rim of a merry-go-round of radius 2.00 m, rotating with an angular speed of 3.00 rad/s. (a) What is the child’s centripetal acceleration? (Ans : 18.0 m/s2) (b) What is the minimum force between her feet and the floor of the carousel that is required to keep her in the circular path? (Ans : 900 N) (c) What minimum coefficient of static friction is required? Is the answer you found reasonable? In other words, is she likely to stay on the merry-go-round? (Ans : 1.84)
A car initially traveling at 29.0 m/s undergoes a constant negative acceleration ofmagnitude 1.75 m/s2 after its brakes are applied, (a) How many revolutions does eachtire make before the car comes to a stop, assuming the car does not skid and the tireshave radii of 0.330 m? (b) What is the angular speed of the wheels when the car hastraveled half the total distance?
A 50.0 kg child stands at the rim of a merry-go-round of radius 2.20 m, rotating with an angular speed of 2.80 rad/s. (a) What is the child's centripetal acceleration? -_______________________m/s2 (b) What is the minimum force between her feet and the floor of the merry-go-round that is required to keep her in the circular path? -_________________________ N(c) What minimum coefficient of static friction is required? -__________________________Is the answer you found reasonable? In other words, is she likely to be able to stay on the merry-go-round?
A roller coaster has a vertical loop with radius 27.2 m. With what minimum speed should the roller-coaster car be moving at the top of the loop so that the passengers do not lose contact with the seats?
A woman places her briefcase on the backseat of her car. As she drives to work, the car negotiates an unbanked curve in the road that can be regarded as an arc of a circle of radius 49.7 m. While on the curve, the speed of the car is 14.3 m/s at the instant the briefcase starts to slide across the backseat toward the side of the car. (a) What force causes the centripetal acceleration of the briefcase when it is stationary relative to the car? Under what condition does the briefcase begin to move relative to the car?(b) What is the coefficient of static friction between the briefcase and seat surface?
(II) A centrifuge rotor rotating at 9200 rpm is shut off andis eventually brought uniformly to rest by a frictionaltorque of 1.20 m N If the mass of the rotor is 3.10 kg andit can be approximated as a solid cylinder of radius0.0710 m, through how many revolutions will the rotorturn before coming to rest, and how long will it take?
A light, rigid rod is 77.0 cm long. Its top end is pivoted on a frictionless, horizontal axle. The rod hangs straight down at rest with a small, massive ball attached to its bottom end. You strike the ball, suddenly giving it a horizontal velocity so that it swings around in a full circle. What minimum speedat the bottom is required to make the ball go over the top of the circle? Answer : 5.49 m/s
A 50.0-kg child stands at the rim of a merry-go-round of radius 2.85 m, rotating with an angular speed of 3.90 rad/s. (a) What is the child's centripetal acceleration?___m/s2(b) What is the minimum force between her feet and the floor of the carousel that is required to keep her in the circular path?___N(c) What minimum coefficient of static friction is required?Is the answer you found reasonable? In other words, is she likely to stay on the merry-go-round? Yes or No ____minimum