On a weather map we see an H for Highs and an L for Lows. In a high pressure region we generally can find
A) stormy weather.
B) clear skies.
C) very cold temperatures.
D) cloud cover.
Answer: B
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A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from a height of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable air resistance
The time the ball remains in the air before striking the ground is closest to A) 16.2 s. B) 3.07 s. C) 3.32 s. D) 3.53 s. E) 3.64 s.
Solids that are good conductors of heat tend also to be good conductors of electricity
a. True b. False Indicate whether the statement is true or false
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C b. 84 N/C c. 34 N/C d. 68 N/C e. 0
A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was
A) 1.2 m/s. B) 15 m/s. C) 30 m/s. D) 45 m/s. E) none of the above