A ball is thrown with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If we can neglect air, what is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
A) 10 m/s
B) 17 m/s
C) 20 m/s
D) zero
A
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Doubling the weight suspended vertically from a coil spring will result in a change in the displacement of the spring's lower end by what factor?
a. 4.0 c. 2.0 b. 3.0 d. 0.5
Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy?
A) first law of thermodynamics B) second law of thermodynamics C) third law of thermodynamics D) law of increasing entropy
If I = 0.40 A in the circuit segment shown below, what is the potential difference Va ? Vb?
a.
31 V
b.
28 V
c.
25 V
d.
34 V
e.
10 V
Why will astronauts probably never set foot on any of the Giant Planets?
A. Their gravitational attraction is so weak that they would float off. B. Their clouds are so hot that any spacecraft getting near it would burn up. C. These planets have no solid surfaces for them to land on. D. Astronauts will land on the Giant Planets-the idea is perfectly reasonable.