Plane A is flying at 600 mph in the northeast direction relative to the Earth. Plane B is flying at 500 mph in the north direction relative to the Earth. What is the speed of Plane B as observed from Plane A?
a. 900 mph
c. 357 mph
b. 431 mph
d. 100 mph
B
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Wire A is twice as long as wire B but is otherwise identical. The electric field acting in each has the same magnitude. How do the currents flowing in these wires compare?
Twenty kilometers is
a. 200,000 m. b. 20,000 m. c. 2,000 m. d. 200 m. e. 0.02 m.
A heavy frog and a light frog jump straight up into the air. They push off in such away that they both have the same kinetic energy just as they leave the ground. Air resistance is negligible
Which of the following statements about these frogs are correct? (There could be more than one correct choice.) A) Just as they leave the ground, the heavier frog is moving faster than the lighter frog. B) Just as they leave the ground, the lighter frog is moving faster than the heavier frog. C) They both leave the ground with the same speed. D) The lighter frog goes higher than the heavier frog. E) The heavier frog goes higher than the lighter frog. F) Both frogs reach the same maximum height.
A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
a. on all three. b. only on the book. c. only on the chair. d. upwards on the chair and downwards on the book. e. only on the objects that you have defined to be part of the system.