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Chapter 6: Q16 P (page 276)
One mole of helium atoms has a mass of grams. If a helium atom in a balloon has a kinetic energy of, what is the speed of the helium atom? (The speed is much lower than the speed of light.)?
The speed of helium atom is,.
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A comet is in elliptical orbit around the Sun. Its closest approach to the Sun is a distance of (inside the orbit of Mercury), at which point its speed is . Its farthest distance from the Sun is far beyond the orbit of Pluto. What is its speed when it is from the Sun? (This is the approximate distance of Pluto from the Sun.)
Figure 6.76 shows the path of a comet orbiting a star.
(a) Rank-order the locations on the path in terms of the magnitude of the comet鈥檚 momentum at each location, starting with the location at which the magnitude of the momentum is the largest. (b) Rank-order the locations on the path in terms of the comet鈥檚 kinetic energy at each location, starting with the location at which the kinetic energy is the largest. (c) Rank-order the locations on the path in terms of the potential energy of the system at each location, largest first. (d) Rank-order the locations on the path in terms of the sum of the kinetic energy and the potential energy of the system at each location, largest first
A nucleus whose mass is undergoes spontaneous alpha decay. The original nucleus disappears and there appear two new particles: a He-4 nucleus of mass (an alpha particle consisting of two protons and two neutrons) and a new nucleus of mass . (Note that the new nucleus has less mass than the original nucleus, and it has two fewer protons and two fewer neutrons.)
(a) What is the total kinetic energy of the alpha particle and the new nucleus?
(b) Use the conservation of momentum in order to determine the kinetic energy of the alpha particle and kinetic energy of the new nucleus.
Use energy conservation to find the approximate final speed of a basketball dropped from a height of m (roughly the height of a professional basketball player). Why don't you need to know the mass of the basketball?
An object with mass 7 kgmoves from a location near the Earth's surface to location. What is the change in the potential energy of the system consisting of the object plus the Earth?
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