Suppose a baseball travels 425 ft (130 m) from where the batter hits it to where it lands in the stands. The ball’s velocity makes an angle of 40° with respect to the horizontal as the ball leaves the bat. Suppose we first calculate the ball’s initial speed ignoring drag and find it to be . Including drag might plausibly require a higher initial speed for the ball to travel the same horizontal distance. On the other hand, by slowing down the ball’s vertical motion, including drag will increase the ball’s flight time, allowing the ball the same distance with a slower horizontal velocity. So if we include drag, for the ball to fly the same horizontal distance will we need
A. An initial speed greater than 
.
B. An initial speed less than .
C. An initial speed equal to .
D. More information to answer for sure.
A. An initial speed greater than .
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Acceleration: The captain orders his starship to accelerate from rest at a rate of "1 g" (1 g = 9.8 m/s2). How many days does it take the starship to reach 10% the speed of light? (Light travels at 3.0 × 108 m/s.)
Fill in the blank(s) with the appropriate word(s).
One reason Earth's atmosphere contains substantially less carbon dioxide than Venus because carbon dioxide dissolves in water and is carried by rain to the surface where it reacts with rocks and forms carbonates.
Answer the following statement true (T) or false (F)
The universal accelerating force could NOT be considered:
A) antigravity. B) Einstein's cosmological constant. C) dark energy. D) vacuum pressure. E) dark matter.
A tiny object carrying a charge of +3.00 ?C and a second tiny charged object are initially very far apart
If it takes of work to bring them to a final configuration in which the +3.00 ?C object i is at x = 1.00 mm, y = 1.00 mm, and the other charged object is at x = 1.00 mm, y = 3.00 mm, find the magnitude of the charge on the second object. (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 2.15 ?C B) 4.30 ?C C) 10.74 ?C D) 4.30 nC