A rock, released at rest from the top of a tower, hits the ground after 2.0 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)
a. 15 m/s
c. 31 m/s
b. 20 m/s
d. 39 m/s
B
Physics & Space Science
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A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
A.
2.7 N
s, up.
s, up.B.
2.7 N
s, down.
s, down.C.
7.3 N
s, up.
s, up.D.
7.3 N
s, down.
s, down.E.
9.6 N
s, up.
s, up.
Physics & Space Science
The focal length of the objective of a telescope is much longer than the focal length of the eyepiece
Indicate whether the statement is true or false
Physics & Space Science
A straight wire of length l is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. If the resistance of the rod is R, what is the current through the rod?
a. R/Blv b. Blv/R c. B2l2v2/R2 d. not given
Physics & Space Science
How many types of quarks are there?
A) 3 B) 6 C) 16 D) 24 E) 2
Physics & Space Science