Chapter 3: Q40P (page 126)
At a particular instant a proton exerts an electric force of on an electron. How far apart are the proton and the electron?
Short Answer
The proton and the electron areapart.
Chapter 3: Q40P (page 126)
At a particular instant a proton exerts an electric force of on an electron. How far apart are the proton and the electron?
The proton and the electron areapart.
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Get started for freeA kg person stands on the Earth’s surface.
(a) What is the approximate magnitude of the gravitational force on the person by the Earth?
(b) What is the magnitude of the gravitational force on the Earth by the person?
Suppose that you are going to program a computer to carry out an iterative calculation of motion involving electric forces. Assume that as usual we use the final velocity in each time interval as the approximate average velocity during that interval. Which of the following calculations should be done before starting the repetitive calculation loop? Which of the calculations listed above should go inside the repetitive loop, and in what order?
(a) Define constants such as
(b) Update the (vector) position of each object.
(c) Calculate the (vector) forces acting on the objects.
(d) Specify the initial (vector) momentum of each object.
(e) Specify an appropriate value for the time step.
(f) Specify the mass of each object.
(g) Update the (vector) momentum of each object.
(h) Specify the initial (vector) position of each object.
A space station has the form of a hoop of radius R, with mass M. Initially its center of mass is not moving, but it is spinning. Then a small package of mass m is thrown by a spring-loaded gun toward a nearby spacecraft as shown in Figure 3.66; the package has a speed v after launch. Calculate the center-of-mass velocity (a vector) of the space station after the launch.
A satellite that is spinning clockwise has four low-mass solar panels sticking out as shown. A tiny meteor traveling at high speed rips through one of the solar panels and continues in the same direction but at reduced speed. Afterward, calculate the components of the center of mass velocity of the satellite. In Figure 3.64 are the initial and final velocities of the meteor, and is the initial velocity of the center of the mass of the satellite, in the x-direction.
A steel ball of mass falls from a height onto a scale calibrated in newtons. The ball rebounds repeatedly to nearly the same height . The scale is sluggish in its response to the intermittent hits and displays an average forceavg, such that where is the brief impulse that the ball imparts to the scale on every hit, and is the time between hits.
Question: Calculate this average force in terms of and physical constants. Compare your result with the scale reading if the ball merely rests on the scale. Explain your analysis carefully (but briefly).
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