A tennis player wants to slam a serve at O so that the ball lands just inside the opposite corner of the court. What should the ratio 
be for the initial velocity 
? The time t = 0 is the time when the ball is hit by the racket.
?
?
A.
B.
C.
D.
E.
Answer: B
You might also like to view...
The principle of conservation of energy states that if the total mechanical energy is a constant then
A. the momentum is always a constant B. no work is done on a system by any nonconservative forces C. no work is done on a system by any forces D. work is done on a system in order to conserve energy
As soon as a ball rolls off the edge of a table
A) it is not acted on by any forces. B) it is not acted on by any horizontal forces. C) has a zero net force acting on it. D) none of the above
How does the equilibrium rule, ?F = 0, relate to Newton's first law of motion?
What will be an ideal response?
Carnot Engine: For a certain ideal Carnot engine, the hot reservoir is 35 C° higher than the cold reservoir. If this engine is to have an efficiency of 20%, what must be the temperature of the hot reservoir?
A. 70.0 K B. 140 K C. 175 K D. 210 K E. 245 K