A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units):
angle of landing height = launch height. What is the initial velocity of launch of the boulders if air resistance is negligible?
A) 44 m/s
B) 1.4 m/s
C) 22 m/s
D) 0.69 m/s
Answer: A
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Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 
m/s by a horizontal magnetic field of 0.50 T directed north.
a. 
b. 
c. 
d. 
Suppose you lived at Earth's equator. Which of the following statements would not be true?
A) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby). B) The south celestial pole is directly on your horizon, due south. C) Every day of the year, the Sun is above your horizon for 12 hours and below it for 12 hours. D) The celestial equator goes through your sky from due east on your horizon, through 50° altitude in the south, to due west on the horizon. E) No stars are circumpolar.
The average velocity of gas molecules in a tank in thermal equilibrium is
1.greater than zero. 2.less than zero. 3.equal to zero. 4.impossible to determine.
The direction of the force on a current carrying wire located in an external magnetic field is which of the following?
a. perpendicular to the field c. Both choices A and B are valid. b. perpendicular to the current d. None of the above are valid.