What is aerobraking?
A) the technique of using a planetary atmosphere to change the orbit of a spacecraft
B) the use of a planetary atmosphere to redirect a spacecraft to another planet
C) the controlled landing of a spacecraft on a planetary surface
D) the gradual decrease of speed as a spacecraft leaves the solar system
E) the destruction of a spacecraft by the intense pressure as it descends into the atmosphere
A
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A figure skater spins at the end of her routine, and slows down with an angular acceleration of 1.2 radians per second squared. If she initially spun with a period of 0.2 seconds, how many turns does she go through while slowing to a stop?
A. 65 B. 6 C. 33 D. 15
A rope pulls on the lower block in the figure with a tension force of 20 N. The coefficient of kinetic friction between the lower block and the surface is 0.16
The coefficient of kinetic friction between the lower block and the upper block is also 0.16. The pulley has no appreciable mass or friction. What is the acceleration of the 2.0 kg block? A) 4.1 m/s2 B) 5.1 m/s2 C) 8.4 m/s2 D) 9.2 m/s2
What evidence supports or undercuts stiffer actions to protect the air? Explain
What will be an ideal response?
Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?
A) the one thrown upward B) the one thrown downward C) neither, both hit with the same speed