We have sent several rovers to explore the surface of Mars. What is the correct order, from oldest to most recent, of these robotic explorers?
A. Viking, Sojourner, Opportunity and Spirit, Curiosity.
B. Opportunity and Spirit, Viking, Sojourner, Curiosity.
C. Sojourner, Viking, Opportunity and Spirit, Curiosity.
D. Viking, Opportunity and Spirit, Sojourner, Curiosity.
Answer: A
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A boy kicks a football with a certain initial velocity at an angle 20° above the horizontal. In 2.0 seconds, the ball reaches at its highest point in its trajectory. What is the initial velocity of the ball?
A) 9.8 m/s B) 20 m/s C) 57 m/s D) 4.9 m/s E) 29 m/s
At t = 0 the switch S is closed with the capacitor uncharged. If C = 40 ?F, ? = 50 V, and R = 5.0 k?, how much energy is stored by the capacitor when I = 2.0 mA?
a.
20 mJ
b.
28 mJ
c.
32 mJ
d.
36 mJ
e.
40 mJ
The allowed values for the magnetic quantum number, m? , are from m? = -? to +?
Indicate whether the statement is true or false
You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. When you increase the plate separation, what happens to the value of E between the plates?
1.It increases. 2.It decreases. 3.It stays the same.