College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 4, Problem 5PE
In Figure 4.7, the net external force on the 24-kg mower is stated to be 51 N. If the
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A robot pushes a 20-kg box on the horizontal surface as part of the moving job. The force is 35 N to the left shown, and the box does not move. The coefficients of friction
between the floor and box are us = 0.75 and uk = 0.40. What is the minimum pushing force (magnitude only) needed to move the box, in Newtons? Use g = 10 m/s2.
Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in
your answer, it is already given in the question statement.
He continues on for a while until he encounters a 500. kg boulder blocking his way. He puffs up his chest, crouches a bit, and begins to push horizontally with a force of 2,205 N. The coefficient of friction between the ground and the boulder was 0.450. Was he able to move it out of the way?
A student with a mass of 68 kg gets on a ferris wheel that rotates at a constant speed. When the ferris wheel reaches its top point, the reaction force applied by the seat to the student is 556 N. What is the reaction force the seat exerts on the student when the ferris wheel reaches its lowest point? (g = 9.8 m / s²)
Chapter 4 Solutions
College Physics
Ch. 4 - Propose a force standard different from the...Ch. 4 - What properties do forces have that allow us to...Ch. 4 - How are inertia and mass related?Ch. 4 - What is the relationship between weight and mass?...Ch. 4 - Which statement is correct? (a) Net force causes...Ch. 4 - Why can we neglect forces such as those holding a...Ch. 4 - Explain how the choice of the “Stem of interest”...Ch. 4 - Describe a situation in which the net external...Ch. 4 - A system can have a nonzero velocity while the net...Ch. 4 - A rock is thrown straight up. What is the net...
Ch. 4 - (a) Give an example of different net external...Ch. 4 - If the acceleration of a system is zero, are no...Ch. 4 - If a constant, nonzero force is applied to an...Ch. 4 - The gravitational force on the basketball in...Ch. 4 - When you take off in a jet aircraft, there is a...Ch. 4 - A device used since the 1940s to measure the kick...Ch. 4 - Describe a Situation in which one a force on and,...Ch. 4 - Why does an ordinary rifle recoil (kick backward)...Ch. 4 - An American football lineman reasons that it is...Ch. 4 - Newton's third law of motion tells us that forces...Ch. 4 - If a leg is suspended by a traction setup as shown...Ch. 4 - Ina traction setup a broken bone, with pulleys and...Ch. 4 - To simulate the apparent weightlessness of space...Ch. 4 - A cartoon shows the toupee coming off the head of...Ch. 4 - Explain, in terms of the properties of the four...Ch. 4 - What is the dominant force between astronomical...Ch. 4 - Give a detailed example of the exchange of a...Ch. 4 - A 63.0-kg sprinter starts a race with an...Ch. 4 - If the sprinter from the previous problem...Ch. 4 - A cleaner pushes a 4.50-kg laundry cart in such a...Ch. 4 - Since astronauts in orbit are apparently...Ch. 4 - In Figure 4.7, the net external force on the 24-kg...Ch. 4 - The same rocket sled drawn in Figure 4.31 is...Ch. 4 - (a) If the rocket sled shown in Figure 4.32 starts...Ch. 4 - What is the deceleration of the rocket sled if it...Ch. 4 - Suppose two children push horizontally, but in...Ch. 4 - A powerful motorcycle can produce an acceleration...Ch. 4 - The rocket sled shown in Figure 4.33 accelerates...Ch. 4 - Repeat the previous problem for the situation in...Ch. 4 - The weight of an astronaut plus his space suit on...Ch. 4 - Suppose the mass of a fully loaded module in which...Ch. 4 - What net external force is exerted on a 1100-kg...Ch. 4 - A brave but inadequate rugby player is being...Ch. 4 - Two teams of nine members each engage in a tug of...Ch. 4 - What force does a trampoline have to apply to a...Ch. 4 - (a) Calculate the tension in a vertical strand of...Ch. 4 - Suppose a 60.0-kg gymnast climbs a rope. (a) What...Ch. 4 - Show that, as stated in the text, a force F...Ch. 4 - Consider the baby being weighed in Figure 4.34....Ch. 4 - A 5.00105 -kg rocket is accelerating straight up....Ch. 4 - The wheels of a midsize car exert a force of 2100...Ch. 4 - Calculate the force a 70.0-kg high jumper must...Ch. 4 - When landing after a spectacular somersault, a...Ch. 4 - A freight train consists of two 8.00104 -kg...Ch. 4 - Commercial airplanes are sometimes pushed out of...Ch. 4 - A 1100-kg car pulls a boat on a trailer. (a) What...Ch. 4 - (a) Find the magnitudes of the forces F1 and F2...Ch. 4 - Two children pull a third child on a snow saucer...Ch. 4 - Suppose your car was mired deeply in the mud and...Ch. 4 - What force is exerted on the tooth in Figure 4.38...Ch. 4 - Figure 4.39 shows Superhero and Trusty Sidekick...Ch. 4 - A nurse pushes a cart by exerting a force on the...Ch. 4 - Construct Your Own Problem Consider the tension in...Ch. 4 - Construct Your Own Problem Consider people pushing...Ch. 4 - Unreasonable Results (a) Repeat Exercise 4.29, but...Ch. 4 -
Ch. 4 - A flea jumps by exerting a force of 1.20105 N...Ch. 4 - Two muscles in the back of the leg pull upward on...Ch. 4 - A 76.0-kg person is being pulled away from a...Ch. 4 - Integrated Concepts A 35.0-kg dolphin decelerates...Ch. 4 - Integrated Concepts When starting a foot race, a...Ch. 4 - Integrated Concepts A large rocket has a mass of...Ch. 4 - Integrated Concepts A basketball player jumps...Ch. 4 - Integrated Concepts A 2.50-kg fireworks shell is...Ch. 4 - Integrated Concepts Repeat Exercise 4.47 for a...Ch. 4 - Integrated Concepts An elevator filled with...Ch. 4 - Unreasonable Results (a) What is the final...Ch. 4 - Unreasonable Results A 75.0-kg man stands on a...Ch. 4 - (a) What is the strength of the weak nuclear force...Ch. 4 - (a) What is the ratio of the strength of the...Ch. 4 - What is the ratio of the strength of the strong...
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- A 80.0-kg skier starts down a 100-m high, 15.0° slope on regular skis. The coefficients of friction between the ski and snow are us 0.250 and uk = 0.150. What is the magnitude of the net force on the skier, in Newtons? Use g = 10.0 m/s². Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forwardA robot pushes a 20-kg box on the horizontal surface as part of the moving job, the force is 35 N to the left shown. The box does not move. The coefficients of friction between the floor and box are µs = 0.75 and uk = 0.40. What is the magnitude of the friction force on the box, in Newtons? Use g = 10 m/s?. Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forwardPlease answer this within 30 mins ! I will upvote !arrow_forward
- Your 10.0kg cell phone on a frictionless table is accelerated by a 5kg mass hanging from a table. How much time do you have to grab the cell phone if it is 25cm from the edge of the table? The rope and pulleys are frictionless and massless.arrow_forwardMary applies a force of 78 N to push a box with an acceleration of 0.40 m/s2. When she increases the pushing force to 90 N, the box's acceleration changes to 0.66 m/s?. There is a constant friction force present between the floor and the box. (a) What is the mass of the box in kilograms? kg (b) What is the coefficient of kinetic friction between the floor and the box?arrow_forwardMary applies a force of 75 N to push a box with an acceleration of 0.43 m/s?. When she increases the pushing force to 85 N, the box's acceleration changes to 0.68 m/s?. There is a constant friction force present between the floor and the box. (a) What is the mass of the box in kilograms? kg (b) What is the coefficient of kinetic friction between the floor and the box?arrow_forward
- Determine the force Q-> when the block moves with constant velocity. Express your answer in vector form.arrow_forwardIn the figure (Figure 1) a worker lifts a weight w by pulling down on a rope with a force F. The upper pulley is attached to the ceiling by a chain, and the lower pulley is attached to the weight by another chain. The weight is lifted at constant speed. Assume that the rope, pulleys, and chains all have negligible weights. In terms of w, find the tension in the lower chain. In terms of w, find the tension in upper chain. In terms of w, find the magnitude of the force F if the weight is lifted at constant speed.arrow_forwardA robot pushes a 20-kg box on the horizontal surface as part of the moving job. The force is 35 N to the left shown, and the box does not move. The coefficients of friction between the floor and box are µs = 0.75 and uk = 0.40. What is the minimum pushing force (magnitude only) needed to move the box, in Newtons? Useg = 10 m/s². Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forward
- Mr. Doyle is pulling his friend up a 25 degree hill in a sled. He is pulling with a force of 676N at an angle of 30 degrees to the incline. The sled starts from rest and has an acceleration of 1.24m/s squared. If the normal force is 328.8N, what is the mass of the sled? What is the coefficient of friction between the sled and the snow? How fast is the sled moving at the top of a 25.0m hill? How long does it take Mr. Doyle to transport his passengers to the top of the hill?arrow_forwardAn astronaut named Johnny is driving to their rocket when they suddenly need to break. The car weighs 1900 lbs and is moving at 35 mi/hr when the astronaut slams on the breaks on dry road. Find the amount of time needed for the car to stop. Use k = 0.7. How many forces are present in the a direction? 1 It'll take the car 11.412 x seconds to stop.arrow_forwardA car (mass = 2,335 kg) is traveling +5.8 m/s when the driver applies the brakes. The car moves 75.3 m before it comes to a complete stop. What is the force applied by the breaks (assuming it remains constant). Use g=9.8arrow_forward
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