If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two hour long movie
a. 1400
b. 25000
c. 50000
d. 170000
e. This cannot be determined without knowing how many reels were used.
d
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The dark spots in this photo (such as the one indicated by the arrow) represent what we call
A) sunspots. B) convection zones. C) coronal holes. D) solar prominences. E) Great Dark Spots.
Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 104 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
A. measured by one clock fixed at one spot on Senesca. B. measured by one clock fixed at one spot on the spaceship. C. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting. D. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting. E. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.
A charged particle having electric charge Q=4.0 e enters a region of magnetic field 1.2 T at an angle of 
relative to the magnetic field direction. If the speed of the particle upon entering the region is 2.8 x 104 m/s and the magnitude of the force on it is 1.3 x 10-14 N, what is the angle 
?
a. 
b. 
c. 
d. 
Areas near a cold ocean or other cold body of water often experience a 'sea breeze' during the late morning, particularly on warm, sunny days. The process of energy transfer most directly associated with the development of the sea breeze is
1.conduction. 2.convection. 3.radiation. 4.none of these.