College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 4, Problem 7CQ
Explain how the choice of the “Stem of interest” affects which forces must be considered when applying Newton's second law of motion.
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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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- Explain how the choice of the “system of interest” affects which forces must be considered when applying Newton’s second law of motion.arrow_forwardConsider two horizontal forces, 225 N and 125 N exerted on a box toward the same direction. Find the vector sum or net force on the box.arrow_forwardThree water skiers are pulled by a boat as shown. Determine the resultant force of the waterskiers and the direction of the resultant measured counterclockwise from the positive x-axis. Draw theresultant force and label the computed angle on an x-y coordinate system.(I am confused on this)arrow_forward
- The diagram below illustrates a particular situation where a horizontal force is applied 150 N to an object resting on a rough surface. If the object has a mass of 5 kg and the coefficient of friction is 0.8, calculate: a) the friction force (Ff). b) the acceleration of the object under the action of these forces.arrow_forwardA block of mass m,- 13.4 kg is on a frictionless table to the left of a second block of mass m,- 21.7 kg, attached by a horizontal string (see the figure below). HINT F (a) If a horizontal force of 2.13 x 102 N is exerted on the block m, in the positive x-direction, use the system approach to find the acceleration (in m/s) of the two blocks. m/s2 (b) What is the tension (in N) in the string connecting the blocks? N Need Help? Read It Watcharrow_forwardThe following statement are correct except; Action and reaction forces are sometimes not equal but oppositely directed The resultant of two forces is the diagonal of that parallelogram formed on the vectors of these forces O Two forces which are in equilibrium may be added to any system of forces without changing the effect of that original forces. All choices are correctarrow_forward
- A runner with a mass of 79 kg accelerates from 0 to 6 m/s in 5 s. Find the net force on the runner using the alternate form of Newton's second law.arrow_forwardA truck of mass 7 tonnes was moving with a velocity of 145 km/hr. The brakes were applied to bring the truck to 5 km/hr in 450 m. Determine the uniform force exerted by the brakes. Also find the velocity it will reach if the same force is applied in the same direction for 9.5 seconds and also find the distance travelled in this period. The uniform force exerted by the brakes in N is The velocity it will reach if the same force is applied in the same direction for 9.5 seconds in m/s is The distance travelled if the same force is applied in the same direction in this period in m isarrow_forwardHow do mimetic forces differ from normative forces? Give an example of each.arrow_forward
- One or more external forces, large enough to be easily measured, are exerted on each object enclosed in a dashed box shown. Identify the reaction to each of these forces.arrow_forwardTwo horizontal forces, 210 N and 194 N, are exerted on a canoe. If the these forces are applied in the same directions, find the net horizontal force on the canoe.arrow_forwardPlot the following sets of forces and find their resultant using both graphical and analytic methods:arrow_forward
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