A projectile is thrown from the top of a building with an initial velocity of 30 m/s in the horizontal direction. If the top of the building is 30 m above the ground, how fast will the projectile be moving just before it strikes the ground?
a. 35 m/s
b. 39 m/s
c. 31 m/s
d. 43 m/s
e. 54 m/s
b
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What is the approximate average temperature of the Sun's surface?
a. 5000oC b. 5800 K c. 10,000oC d. 6400 K e. 5800oC
At the time of the winter solstice (the start of winter), the Sun is
a. farthest south of the celestial equator. b. farthest north of the celestial equator. c. on the celestial equator moving north. d. on the celestial equator moving south.
Compound Microscope: The focal lengths of the objective lens and the eyepiece in a microscope are 2.90 mm and 2.50 cm, respectively. An object is placed 3.00 mm from the objective. The image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. What is the distance between the objective and the eyepiece?
A. 9.9 cm B. 9.0 cm C. 15 cm D. 11 cm E. 13 cm
An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2 . What is the magnitude of the force the object exerts on the floor of the elevator?
a. 59 N b. 10 N c. 89 N d. 68 N e. 78 N