COLLEGE PHYSICS,VOLUME 1
2nd Edition
ISBN: 9781319115104
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 86QAP
To determine
The contact force between the two bumpers.
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5.)
-1.7 m
A
D
1.8 m
2.5m
12 m
B
0.75 m
Crate D has a mass of 250 kg and Crate C has a mass of 300 kg are in the back of the pickup truck. The
pickup truck has a mass of 1200 kg.
a.) Calculate the reactions at each of the two front wheels B and two rear wheels A
b.) If the static friction is 0.4, and the emergency brake is on, calculated the friction force on the
wheels. The person in the car hits the accelerator pedal, and the engine produces a force of
5000 N, does the car move?
3- The student pushes horizontally on a 37 kg box with a force of 115 N.
The coefficient friction between the box and the floor is 0.37. What is the
frictional force on the crate from the floor?
a- 115 b- 230 c-110
d-121
Q2) A hockey puck having a mass of 0.3 kg slides on the horizontal, frictionless surfuce of an ice rink. Two
hockey sticks strike the puck simultaneously, exerting the forces on the puck shown in Figure 2. The force
Fi has a magnitude of 5 N, and the force F: has a magnitude of 8 N. Determine both the magnitude and the
direction of the puck's acceleration.
- 5ON
- KON
Fig 2
Chapter 4 Solutions
COLLEGE PHYSICS,VOLUME 1
Ch. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAPCh. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAP
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- As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 61.0 kg. If this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 6.00 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine (a) the salmons acceleration and (b) the magnitude of the force F during this interval.arrow_forwardA block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.arrow_forwardAn airplane of mass 1.50 104 kg is in level flight, initially moving at 60.0 m/s. The resistive force exerted by air on the airplane has a magnitude of 4.0 104 N. By Newtons third law, if the engines exert a force on the exhaust gases to expel them out of the back of the engine, the exhaust gases exert a force on the engines in the direction of the airplanes travel. This force is called thrust, and the value of the thrust in this situation is 7.50 104 N. (a) Is the work done by the exhaust gases on the airplane during some time interval equal to the change in the airplanes kinetic energy? Explain. (b) Find the speed of the airplane after it has traveled 5.0 102 m.arrow_forward
- An automobile driver traveling down an 8% grade slams on his brakes and skids 30 m before hitting a parked car. A lawyer hires an expert who measures the coefficient of kinetic friction between the tires and road to be k = 0.45. Is the lawyer correct to accuse the driver of exceeding the 25-MPH speed limit? Explain.arrow_forwardTwo teams of nine members each engage in a tug of war. Each of the first team's members has an average mass of 68 kg and exerts an average force of 1350 N horizontally. Each of the second team's members has an average mass of 73 kg and exerts an average force of 1365 N horizontally. (a) What is magnitude of the acceleration of the two teams? (b) What is the tension in the section of rope between the teams?arrow_forwarda) "A swimmer pushing off from the side of a pool. She pushes against the pool wall with her feet and accelerates in the direction opposite to her push" What is the concept of above situation and explain.arrow_forward
- X - axis y -axis The object is subjected to two forces F1 = 25 N, and F2 = 50 N. Set x = 30°, 0 = 45°, and ß = 30°. %3D 1 - What is the magnitude of the resultant of these two forces? a) 39.4 N b) 80.1N c) 41.6 N d) 69.8 N e) 71.4 N f) 46.1 N g) None of them 2 - What is the direction of the resultant force measured counterclockwise from the positive x-axis? a) 14. 3° b) 392.6° c) 9.2° d) 322.9° e) 6.8° f) 344.2° g) None of themarrow_forwardA large truck breaks down out on the road and receives a push back into town by a small compact car. While the car, still pushing the truck, is speeding up to get up to cruising speed: a) the amount of force of the car pushing against the truck is equal to the that of the truck pushing back against the car b) the amount of force of the car pushing against the truck is less than that of the truck pushing back against the car c) the amount of force of the car pushing against the truck is greater than the that of the truck pushing against the car d) The car’s engine is running so it applies a force as it pushes against the truck but the truck’s engine is not running so it can’t push back against the car, the truck is pushed forward simply because it is in the way of the car e) neither the car not the truck exert any force on the other, the truck is pushed forward simply because it is in the way of the cararrow_forward1. Calculate the sum of the two forces exerted on the boat by workers A and B. F- 40.0N 45.0 37.0 F-30.0Narrow_forward
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