How long is a day on Mars?
A) 243 Earth days
B) about 4.2 Earth days
C) 24 hours, 36 minutes
D) 23 hours, 56 minutes
E) 9 hours, 55 minutes
C
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Consider the planet Mars: [Earth mass = 6.0 × 1024 kg = 9.3 × Mars mass; Earth radius = 6380.km = 1.89 × Mars radius] What is the acceleration of gravity on Mars?
What will be an ideal response?
A baseball pitcher throws a fastball at 98 mph. He also has a slower "changeup" pitch, 75 mph, which he throws identically, same windup and same release angle from shoulder height. Which pitch gets to home plate with a flatter trajectory-i.e., velocity vector closer to horizontal?
A. The fastball B. The changeup C. They each have same trajectory, since the distance to home plate is the same
The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 0.0 m to 10.0 m?
A. 34 J
B. 45 J
C. 52 J
D. 64 J
E. 75 J
Starship "Alpha" travels at 0.9c past an identical starship "Beta," which is at rest. Both a cabin boy on the "Alpha" and a cook on the "Beta" measure the time required for the other ship to pass by their respective windows. Who measures the longer time?
A. The cabin boy B. Both measure the same time C. The measured times cannot be compared D. The cook