What is the current in the 15-? resistor when ? = 9.0 V?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
e.
0.60 A
a
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Power: A 100%-efficient engine is being used to raise a 89-kg crate vertically upward at a steady rate. If the power output of the engine is 1620 W, how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible.
Fill in the blank(s) with the appropriate word(s).
A light flash leaves a master clock at x = 0 at time t = -12 s, is reflected from an object a certain distance in the -x direction from the origin, and then returns to the origin at t = +8 s. From this information, we can infer that the spacetime coordinates of the reflection event are [t, x] =
A. [4 s, 20 s] B. [-4 s, -20 s] C. [10 s, -2 s] D. [2 s, -10 s] E. [-2 s, -10 s] F. Other (specify)
The amount of energy converted to light by an incandescent light bulb is about
A) 10% and the amount converted to heat about 90% B) 90% and the amount converted to heat about 10%. C) either of these depending on the brand.
Approximately how many half-life periods must elapse if the activity of a radioactive isotope sample is to be reduced to 0.003 of the original value?
a. 5 b. 4 c. 9 d. 16 e. 8