What is the difference in meaning between the terms weather and climate?
A) Weather refers to local conditions, and climate refers to global conditions.
B) Weather refers to short-term variations in conditions, and climate refers to the average of weather over many years.
C) Weather refers to small storms, and climate refers to large storms.
D) Weather refers to wind and rain, and climate refers to processes like convection.
E) Weather refers to day-by-day changes in conditions, and climate refers to seasonal changes in weather.
B) Weather refers to short-term variations in conditions, and climate refers to the average of weather over many years.
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If a beam of electromagnetic radiation has an intensity of 120 W/m2, what is the maximum value of the electric field? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 1.5 kV/m B) 1.0 µT C) 1.0 µV/m D) 0.30 kV/m E) 0.0032 V/m
A person running in place on an exercise machine for 10 min uses up 17 kcal (food calories). Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm
How many repetitions of this exercise are equivalent to 10 minutes of running in place? Assume that the person uses negligible energy in letting down the weights after each lift. (1 cal = 4.186 J) A) 730 B) 2900 C) 1450 D) 2200 E) 1500
The force that keeps your feet from sliding as you walk is
a. centripetal force b. weight c. kinetic friction d. static friction e. none of the above
A pendulum makes 12 complete swings in 8.0 s
(a) What is its frequency? (b) What is its period?