A small object has an angular diameter of 
When viewed through a magnifier, it has an angular diameter of 
What is the angular magnification in this case?
A. 4.0
B. 8.0
C. 16
D. 32
E. 8.5
C. 16
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Of the common battery sizes AAA, AA, C, and D, which provides the highest emf?
A. AAA B. AA C. C D. D E. all have the same emf
The observed relativistic length of a super rocket moving by the observer at 0.70c will be what factor times that of the measured rocket length if it were at rest?
a. 0.55 b. 0.71 c. 0.51 d. 1.4 e. 1.8
Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200-kg car (a so-called compact model) to a rest in 15 cm
when the car had an initial speed of 2.0 m/s (about 4.5 mph). (Bumpers are built with springs that compress to provide a stopping force without, hopefully, denting the metal.) A) 3.2 × 104 N B) 1.6 × 104 N C) 5.4 × 104 N D) 1.8 × 104 N E) 6.5 × 105 N
A jet plane is launched from a catapult on an aircraft carrier. In 2.0 s it reaches a speed of 42 m/s at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2.0 s?
A) 16 m B) 24 m C) 42 m D) 84 m