Dactyl was photographed by the Galileo spacecraft. It is:
A) a moon of the asteroid Ida.
B) a moon of Halley's Comet.
C) one of the small moons of Jupiter, thought to be a captured asteroid.
D) one of the larger asteroids found in the asteroid belt.
E) an Earth-crossing asteroid.
A
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Laplace's nebular hypothesis was problematic in that he could not explain ____
a. the different types of planets b. the rotational direction of the planets c. how the Sun had <0.5% of the Solar System's angular momentum d. how one star could come within a close encounter of another star e. how gravity was the dominant force of planet formation
A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s. It takes it 0.0655 s to reach the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.212 kg?m/s B) 0.262 kg?m/s C) 0.163 kg?m/s D) 0.0216 kg?m/s E) 0.0418 kg?m/s
In a ballistics test, a 28-g bullet pierces a sand bag that is 30cm thick
If the initial bullet velocity was 55m/s and it emerged from the sandbag moving at 18m/s what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag? A) 1.3 N B) 130 N C) 38 N D) 13 N
State the principle of conservation of mechanical energy
What will be an ideal response?