Two springs, each with spring constant 20 N/m, are connected in parallel, and the combination is hung vertically from one end. A 50-N weight is then suspended from the other end of the combined spring. How far does the combined spring stretch as it comes to equilibrium?
a. 5 m
b. 2.5 m
c. 10 m
d. 0.63 m
e. 1.25 m
Ans: e. 1.25 m
You might also like to view...
A 20-mF capacitor charged to 2.0 kV and a 40-mF capacitor charged to 3.0 kV are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 20-mF capacitor after the two are so connected?
a. 53 mC b. 27 mC c. 40 mC d. 80 mC e. 39 mC
What is an antinode?
a. The opposite of a node—in other words, the part of a standing wave that is moving. b. The position on a standing wave moving with the smallest amplitude. c. The position on a standing wave moving with the largest amplitude. d. Any position on a standing wave where there is no movement. e. The position on a standing wave moving with the largest frequency.
When SI units are plugged into an equation, it is found that the units balance. Which of the following can we expect to be true for this equation?
a. The equation will be dimensionally correct. b. The equation will be dimensionally correct except sometimes in cases when the right-hand side of the equation has more than one term. c. The equation will not be dimensionally correct. d. All constants of proportionality will be correct.
A star (no matter what its mass) spends most of its life
A) as a main-sequence star. B) as a T-Tauri variable star. C) as a planetary nebula. D) as a protostar. E) as a red giant or supergiant.