A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of the acceleration at a minimum? Note: Air resistance is negligible
a. just after leaving the center fielder's hand
b. just before arriving at the catcher's mitt
c. at the top of the trajectory
d. acceleration is constant during the entire trajectory
D
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Multiple-Object Accelerating Systems: Three boxes are pulled along a horizontal frictionless floor by a constant horizontal pull P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as shown in the figure. Which of the following statements about the tensions is correct? (There could be more than one correct choice.)
A. T1 = P B. T2 = P C. T1 + T2 = P D. T2 > T1 E. T1 > T2
Gravitational waves that carry energy and angular momentum away from the system cause white dwarfs to gradually spiral in toward each other and merge
Indicate whether the statement is true or false
The Mars Curiosity rover, landed on the surface of Mars using
A) balloons B) a skycrane C) parachutes D) airbags
Which planet(s) have an atmosphere that consists mostly of carbon dioxide?
A) Venus and Mars B) Venus, Earth, and Mars C) Venus only D) Mars only