When is the north polar axis tilted most toward the Sun?
What will be an ideal response?
our summer solstice
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RMS and Peak Quantities: American power plants usually supply 120 V ac.(a) At what frequency is this voltage supplied?(b) What is the maximum voltage?
What will be an ideal response?
Kieran takes off from rest down a 50 m high, 10° slope on his jet-powered skis. The skis have a thrust of 280 N parallel to the surface of the slope
The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible). Kieran's speed at the bottom is 40 m/s. What is the coefficient of kinetic friction of his skis on snow? A) 0.47 B) 0.58 C) 0.23 D) 0.29
Air is pumped into a bicycle tire at constant temperature. The pressure increases because:
A. more molecules strike the tire wall per second B. the molecules are larger C. the molecules are farther apart D. each molecule is moving faster E. each molecule has more kinetic energy
If 5.0 × 10^21 electrons pass through a 20-? resistor in 10 min, what is the potential difference across the resistor?
a. 21 V b. 32 V c. 27 V d. 37 V e. 54 V