College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 4, Problem 25CQ
Explain, in terms of the properties of the four basic forces, why people notice the gravitational force acting on bodies fit it is such a comparatively weak force.
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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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- Estimate the gravitational force between two sumo wrestlers, with masses 220 kg and 240 kg, when they are embraced and their centers are 1.2 m apart.arrow_forwardA 200-kg object and a 500-kg object are separated by 4.00 m. (a) Find the net gravitational force exerted by these objects on a 50.0-kg object placed midway between them. (b) At what position (other than an infinitely remote one) can the 50.0-kg object be placed so as to experience a net force of zero from the other two objects?arrow_forwardThe gravitational force exerted on an astronaut on the Earths surface is 650 N directed downward. When she is in the space station in orbit around the Earth, is the gravitational force on her (a) larger, (b) exactly the same, (c) smaller, (d) nearly but not exactly zero, or (e) exactly zero?arrow_forward
- In the law of universal gravitation, Newton assumed that the force was proportional to the product of the two masses (m1m2) . While all scientific conjectures must be experimentally verified, can you provided arguments as to why this must be? (You may wish to consider simple examples in which any other form would lead to contradictory results.)arrow_forwardHow far from the center of the Sun would the net gravitational force of Earth and the Sun on a spaceship be zero?arrow_forwardA point mass m is located a distance D from the nearest end of a thin rod of mass M and length L along the axis of the rod. Find the gravitational force exerted on the point mass by the rod.arrow_forward
- Calculate the mass of the Sun based on data for average Earth’s orbit and compare the value obtained with the Sun’s commonly listed value of 1.9891030kg .arrow_forwardSolving Problems with Newton’s Laws To sirmulate the apparent weightlessness of space orbit, astronauts are trained in the hold of a cargo aircraft that is accelerating downward at Why do they appear to be weightless, as measured by standing on a bathroom scale, in this accelerated frame of reference? Is there any difference between their apparent weightlessness on orbit and in the aircraft?arrow_forwardThe principle of equivalence states that all experiments done in a lab in a uniform gravitational field cannot be distinguished from those done in a lab that is not in a gravitational field but in uniformly accelerating. For the latter case, consider what happens to a laser beam at some height shot perfectly horizontally to the floor, across the accelerating lab. (View this from a nonaccelerating frame outside the lab.) Relative to the height of the laser, where will the laser beam hit the far wall? What does this say about the effect of a gravitational field on light? Does the fact that light has no mass make any difference to the argument?arrow_forward
- Check Your Understanding There is another consideration to this last calculation of ME. We derived Equation 13.8 assuming that the satellite orbits around the center of the astronomical body at the same radius used in the expression for the gravitational force between them. What assumption is made to justify this? Earth is about 81 times more massive than the Moon. Does the Moon orbit about the exact center of Earth? Which is about 17,000 mph. Using Equation 13.8, the period is T=2r3GME=2( 6.37 10 6+4.00 10 5m)3(6.67 10 11N m 2 /kg 2)(5.96 10 24kg)=5.55103sarrow_forwardRespond to each statement, true or false: (a) No force of gravity acts on an astronaut in an orbiting space station. (b) At three Earth radii from the center of Earth, the acceleration of gravity is one-ninth its surface value. (c) If two identical planets, each with surface gravity g and volume V, coalesce into one planet with volume 2V, the surface gravity of the new planet is 2g. (d) One kilogram of gold would have greater value on Earth than on the Moon.arrow_forward
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