Doppler radars at airports are capable of detecting dangerous, downward ______________
Fill in the blank(s) with correct word
wind bursts, or wind shears
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A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels
A) nowhere. B) 100 m. C) 141 m. D) 200 m. E) more than 200 m.
The closest known star to our solar system is Alpha Centauri, which is approximately 4.30 light years away. A spaceship with a constant speed of 0.800c relative to the earth travels from Earth to this star
(a) How much time would elapse during the trip on a clock on board the spaceship? (b) How much time would elapse during the trip on a clock on Earth?
A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400, and the coefficient of kinetic friction is 0.300
What is the maximum acceleration that the truck can have if the crate is to stay in place relative to the truck? A) 8.00 m/s2 B) 3.92 m/s2 C) 196 m/s2 D) 78.5 m/s2 E) 7.84 m/s2
One stone is dropped from the side of a bridge, and a second is dropped from the same place a short time later. What is true about the distance between the stones as a function of time after both have been dropped? Ignore air resistance
A. Increases, finally reaching a constant value B. Always increases C. Is constant D. Decreases, and then reaches a constant value E. Always decreases