In the figure, a 5.00-kg block is moving at 5.00 m/s along a horizontal frictionless surface toward an ideal massless spring that is attached to a wall
After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. What is the speed of the block when it has moved so that the spring is compressed to only one-half of the maximum distance?
What will be an ideal response?
Answer: 4.3 m/s
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Determine (a) the temperature at the 16 equally spaced points shown in the accompanying sketch to an accuracy of three significant figures and (b) the rate of heat flow per meter thickness. Assume two-dimensional heat flow and k = 1 W/(mK).
GIVEN
A two-dimensional object with specified surface temperatures
FIND
(a) The temperature at the 16 specified locations
(b) The heat flow per meter thickness
ASSUMPTIONS
Steady state
SKETCH
An electron is traveling due south when it enters a uniform magnetic field directed due west. Which of the following statements concerning this situation is false?
a) The subsequent motion of the electron will be the same as if there were an electric field directed due west and no magnetic field present. b) The electron will follow a curved path. c) The direction of the magnetic force on the electron will vary with time. d) The magnitude of the magnetic force will be constant with time. e) The direction of the magnetic field and the direction of the magnetic force on the electron are perpendicular to one another.
A nucleus undergoes radioactive decay, emitting a gamma ray. Which of the following statements is true?
A. A nuclear proton changes into an electron-positron pair. B. Both daughter and parent nuclei have the same atomic number. C. The daughter nucleus is more massive than the parent. D. The daughter nucleus has more neutrons than the parent.
The purity of an alloy is given by the _____________.
Fill in the blank(s) with the appropriate word(s).