Springs: If 4.0 J of work are performed in stretching an ideal spring with a spring constant (force constant) of 2500 N/m, by what distance is the spring stretched?
A. 3.2 cm
B. 3.2 m
C. 0.3 cm
D. 5.7 m
E. 5.7 cm
Answer: E
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Two water waves, call them X and Y, have the same amplitude, but X has a higher frequency than Y. Regarding their wavelengths and their energies,
A) Y has the larger wavelength and the two waves carry the same energy. B) X has the larger wavelength and carries the greater energy. C) Y has the larger wavelength and carries the greater energy. D) Y has the larger wavelength and X carries the greater energy. E) X has the larger wavelength and Y carries the greater energy.
A particle is moving the +x direction at speed c/2 . Another particle is moving in the –x direction at speed c/2 toward the first particle. Which of the following best describes the speed of one particle as seen by an observer moving with the other particle?
a. c b. some value less than 3c/4 c. some value more than 3c/4 d. 3c/4
Pumped water storage has too many practical reasons why it cannot be done
What will be an ideal response?
What is the x-component of a force vector of magnitude 27.0N directed at 73o above the negative y-axis?
A. +7.9N B. -7.9N C. -25.8N D. -8.3N E. +25.8N F. +8.3N