The force of gravity on a satellite in circular orbit doesn't change its speed because the force is
A) small compared to other forces on it.
B) canceled by centrifugal force.
C) perpendicular to its direction of motion.
D) very weak due to altitude.
Answer: C
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A rifle is aimed horizontally toward the center of a target 120 m away. If the bullet strikes 11.2 cm below the center, what was the velocity of the bullet? (Ignore air friction.)
a. 23 m/s b. 1 120 m/s c. 32 m/s d. 790 m/s e. 400 m/s
A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will
A) be behind the bomb. B) be over the bomb. C) be in front of the bomb. D) depend of the speed of the plane when the bomb was released. E) depend of the mass of the bomb when it was released.
If a star is over ________ solar masses, its core can collapse to a black hole in a hypernova
A) 1.4 B) 3 C) 8 D) 25 E) 100
People can snorkel down to a depth of roughly one meter. This means that the additional pressure on the air in their lungs is roughly
a. 9 800 N. b. 9 800 Pa. c. 9 800 ATM. d. 19 600 N. e. 19 600 N/m2.