In this experiment which forces are considered + (positive) and which are – (negative)?
Since all relevant forces are in the y-plane, by convention all upward forces are +
(positive) and all downward forces are – (negative).
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A. 45° B. 90° C. 45°, 90° D. 45°, 135° E. 45°, 90°, 135°
The path that led to modern science emerged from ancient civilizations in which part of the world?
What will be an ideal response?
In an x-ray tube, high-speed electrons are slammed into a lead target, giving off x-rays. If the electrons are accelerated from rest through a potential difference of 160 000 volts, what speed do they have when they strike the target? (qe = 1.6 × 10^?19 C, me = 9.11 × 10^?31 kg, and c = 3.00 × 10^8 m/s)
a. 0.79c b. 0.65c c. 0.83c d. 0.49c e. 0.48c
A 400-W computer (including its monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a 365-day year?
A) $120 B) $1200 C) $15 D) $150