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

Physics & Space Science

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Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy?

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If I = 0.40 A in the circuit segment shown below, what is the potential difference Va ? Vb?



a.
31 V

b.
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c.
25 V

d.
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e.
10 V

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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

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