A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m
b. 15.8 m
c. 13.5 m
d. 11.0 m
e. 4.9 m
c
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An object is dropped from a bridge. A second object is thrown downwards 1.00 s later. They both reach the water 20.0 m below at the same instant. What was the initial speed of the second object?
A) 4.91 m/s B) 14.6 m/s C) 9.90 m/s D) 19.6 m/s E) 21.3 m/s
Which of the following is a method of heat transport that involves the movement of warm molecules of gas or liquid from one region to another?
a. Convection b. Conduction c. Radiation
Suppose we could magically double the mass of the moon, double the mass of Earth, and double the distance between Earth and the moon, all at the same time. How would this affect the force that the moon exerts on Earth?
A) The force would be halved. B) The force would be quadrupled. C) The force would be doubled. D) The force would be unchanged. E) The force would be multiplied by eight.
What is the shape factor?
What will be an ideal response?