Three objects of masses 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mass of this system?
A) (1.3 m, 0.67 m)
B) (1.3 m, -0.67 m)
C) (-1.3 m, 0.67 m)
D) (-1.3 m, -0.67 m)
B
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A 25.0-mH inductor is connected in series to a 20.0-? resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the time constant of this circuit?
A) 0.800 × 10-3 s B) 0.800 × 10-2 s C) 0.500 s D) 1.25 × 10-3 s E) 12.5 × 10-2 s
If a cast iron has the designation 60-40-18, the yield strength is equal to _________psi.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not true of the special theory of relativity?
A) The theory is valid only at speeds close to the speed of light. B) The special theory does not apply to situations that involve substantial acceleration or gravity; for that, you need the general theory of relativity. C) For low speeds, the theory predicts effects that are so small that they cannot be noticed without extremely precise, high-tech measurement. D) The theory tells us that there is no such thing as absolute time or space because measurements of time and space depend on your reference frame.
A stone is thrown straight up. What is its acceleration at the highest point?
What will be an ideal response?