You throw a ball up in the air and hold your hand under it to catch it when it comes down. The reason why the ball stops is because
a. your hand is there: your hand exerts no force on the ball.
b. your hand exerts a force on the ball perpendicular to its velocity.
c. your hand exerts a force on the ball in the direction of its velocity.
d. your hand exerts a force on the ball in the direction opposite to its velocity.
e. your hand and the ball exert forces in the same direction on each other.
D
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Indicate whether the statement is true or false
Suppose one observes cosmic rays creating a new particle high in the atmosphere and the particle moves at 99.7% the speed of light. It is observed to decay in an average 37.0 ?s. What is the proper lifetime of the particle?
A) 2.86 ?s B) 4.33 ?s C) 18.1 ?s D) 12.4 ?s E) 5.33 ms
While the historical definition of a constellation is "a pattern or figure of stars in the sky," the modern definition used by astronomers is
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Explain how Copernicus would account for the retrograde loops of superior planets
What will be an ideal response?