COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 67QAP
To determine
Coefficient of static friction of the coin and the surface
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A child places a picnic basket on the outer rim of a merry-go-round that has a radius of 5.0 m and revolves once every 27 s. (a) What is
the speed of a point on that rim? (b) What is the lowest value of the coefficient of static friction between basket and merry-go-round
that allows the basket to stay on the ride?
(a) Number i
(b) Number i
Units
Units
8-105. A 10-kg cylinder D, which is attached to a small pulley B, is placed
on the cord as shown. Determine the largest angles so that the cord does
not slip over the peg at C. The cylinder at E also has a mass of 10 kg, and the
coefficient of static friction between the cord and the peg is μ = 0.1.
PROB. 8-105
A
0
B
D
0
E
2) Modern roller coasters have vertical loops like the one
shown in the figure. The radius of curvature is smaller at
the top than on the sides so that the normal force will not
get too small, keeping the passengers pressed firmly into
their seats. What is the speed of the roller coaster at the
top of the loop if the radius of curvature there is 15.0 m
and the normal force on a passenger is equal to 3/4 of
their weight?
B
minimum
C
maximum
A
Chapter 5 Solutions
COLLEGE PHYSICS
Ch. 5 - Prob. 1QAPCh. 5 - Prob. 2QAPCh. 5 - Prob. 3QAPCh. 5 - Prob. 4QAPCh. 5 - Prob. 5QAPCh. 5 - Prob. 6QAPCh. 5 - Prob. 7QAPCh. 5 - Prob. 8QAPCh. 5 - Prob. 9QAPCh. 5 - Prob. 10QAP
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- A uniform pole is propped between the floor and the ceiling of a room. The height of the room is 7.80 ft, and the coefficient of static friction between the pole and the ceiling is 0.576. The coefficient of static friction between the pole and the floor is greater than that between the pole and the ceiling. What is the length of the longest pole that can be propped between the floor and the ceiling?arrow_forward70 0• One end of a uniform meter stick is placed against a vertical wall (Fig. P70). The other end is held by a light- weight cord that makes an angle 0 with the stick. The Figure P70 coefficient of static friction between the end of the meter - x - stick and the wall is 0.40. (a) What is the maximum value the angle 0 can have if the stick is to remain in equilibrium? (b) Let the angle 0 be 15°. A block of the same weight as the meter stick is suspended from the stick, as shown, at a distance x from the wall. What is the minimum value of x for which the stick will remain in equilibrium? (c) When 15°, how large must the coefficient of static friction be so that the block can be attached 10 cm from the left end of the stick with- out causing it to slip?arrow_forward6-70. Determine the horizontal and vertical components of force at pins B and C. The suspended cylinder has a mass of 75 kg 03 m B 15 m 0.5 m Prob. 6-70arrow_forward
- A load of 52 kg is placed on the flatbed of a truck going around a section of flat road corresponding to a circular arc with a radius of 80 m. If the coefficient of static friction between the load and the truck's flatbed is 0.355, what is the maximum speed the truck can have so the load won't slide? a) 28.0 m/s b) 5.33 m/s c) 16.7 m/s d) 22.6 m/s e) 279 m/sarrow_forwardQUESTION 5 A 260 kg man climbs a 10 m, 40 kg ladder successfully to its top. The ladder in net at 60 degrees between the ladder and the flat ground. The contact between the ladder and the vertical wall is frictionless. What is the smallest value of static friction between the ladder and the floor that would allow him NOT to slip? O a. 0.50 Ob. 0.55 Oc.0.60 Od.0.05 O.0.70 QUESTION 6 A 2000 kg beam is attached to a wall at the beam's left end by a hinge to the wall. The beam is supported by a cable anchored in the wall and attached to the right end of thee 20 m beam. The cable is attached to the beam making a 40 degree angle between the horizontal beam and the cable. What must the tension in the cable be? O a. 8762 N O b. 10540 N O c. 12793 N Od. 13647 N Oe. 15246 Narrow_forward30 - A bead slides without friction on the folded wire as a circle from its end, as shown in the figure. The bead is dropped from a height of h = 4.00 R. This bead has a mass of 5.00 g. Find the magnitude and direction of the force acting on this bead at point Ⓐ. a) 0.248 N: downstream B) 0.098 N: downstream NS) 0.147 N: downstream D) 0.098 N: upwards TO) 0.345 N: upwardsarrow_forward
- Shawn White rides his snowboard over a hilltop that has a radius of curvature 80 m at the top of the hill. With what minimum speed will Shawn and his snowboard lose contact with the snow when he is at the top of the hill? A) 22.2 m/s B) 41.8 m/s C) 34.3 m/s D) 28.0 m/s E) 14.5 m/sarrow_forwardQuestion 2 - Go Kart Track Your go karts have a mass of 450kg and travel around a circular curve on a flat, horizontal track at a radius of 42 m. a) Draw a diagram to show the go kart on the track and add an arrow to show the direction of the frictional force needed for the car to travel around the curve at a radius of 42 m. b) The maximum frictional force between the tyres and the road is equal to 20% of the weight of the car and driver. Calculate the coefficient of friction when an adult of mass 70kg is driving the kart. c) Calculate maximum angular velocity at which the car can travel round the curve at a constant radius of 42 m.arrow_forwardA string can support a stationary hanging load of mass 25 kg before breaking. a) Calculate the maximum tension that the string can support. b) Suppose one end of the string is attached to an object of mass m = 3 kg, while the other end is fixed to the center of a frictionless table as shown in the figure. When given an initial speed, the object moves along a horizontal circle of radius R = 0.8 m. Calculate the maximum speed the object can have before the string breaks.arrow_forward
- 1. A parallel force system acts on the lever shown in Fig. P-236. Determine the magnitude and position of the resultant. 30 lb 60 lb 20 lb 40 lb 2' 3' 2' 4' Figure P-236arrow_forwardBraving the Rotor at the Amusement Park (Circular Motion Due to Normal Force) The Rotor is an amusement park ride where people stand against the inside of a spinning cylinder, as shown below. Once the cylinder is spinning at a certain speed, the floor drops out of the bottom of the cylinder but the people do not fall out of the bottom. A conservative low estimate of the coefficient of static friction between people's clothes and the cylinder wall is 0.45. The radius of the cylinder is 2.4 m. What is the minimum number of rpm that the cylinder can have so that the people do not fall out the bottom? (answer: 29 rpm)arrow_forwardQuestion 13 A 1200 kg car is driving on a flat circular track with a radius of 89.81 m. The coefficient of static friction is 0.50. What is the max speed the car can drive without slipping? (1316) A) O29.67 m/s B) O0.37 m/s C) O25173.39 m/s D) O20.98 m/s E) O726.69 m/s Review Laterarrow_forward
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