From the edge of a roof top you toss a green ball upwards with initial velocity v0 and a blue ball downwards with the same initial velocity. When they reach the ground below,
A) the green ball will be moving faster than the blue ball.
B) the blue ball will be moving faster than the green ball.
C) the two balls will have the same speed.
C
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Edwin Hubble and Milton Humason discovered that there was a linear relationship between a galaxy's ____
a. rotation curve and distance b. mass and luminosity c. age and distance d. apparent recession velocity and distance e. mass and recession velocity
The gravitational effects of _______________ can confine some rings in narrow strands or keep the edges of rings sharp
Fill in the blank(s) with correct word
Answer the following statement(s) true (T) or false (F)
1.When a baseball pitcher throws a curveball, he or she puts top-spin on the ball. This causes the ball to interact with the passing air in such a way as to make the air push the ball downward perpendicular to the ball’s velocity. (This causes the ball to dive sharply as it approaches the plate, making it quite difficult to hit.) We would classify this force as a “lift” force on the ball.
The principal advantage of ac power over dc power is that
A) more energy is dissipated during transmission. B) ac voltage oscillates while dc voltage does not. C) ac voltage can be transformed via conventional transformers. D) ac circuits multiply power more easily. E) ac circuits are safer.