When a flower petal is 4.0 cm in front of a convex lens, the inverted image is half the height of the petal. What is the focal length of this lens?
A) 1.3 cm
B) 2.0 cm
C) 4.0 cm
D) 5.3 cm
A
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A limitation of all electric automobiles is
A. Low energy density per battery. B. Batteries explode more readily than gasoline. C. Electric energy is not useful for autos. D. Electric motors are less efficient than gasoline motors.
Uniform Circular Motion: A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m. The car maintains its speed as it drives through the depression. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A. 200 N B. 390 N C. 790 N D. 490 N E. 590 N
A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg ? m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg ? m2, what is the final angular speed?
A) 2.25 rad/s B) 4.60 rad/s C) 6.25 rad/s D) 1.76 rad/s E) 0.810 rad/s
Which object has the most kinetic energy?
A) a 4-ton truck moving 50 km/hr B) a 3-ton truck moving 70 km/hr C) a 2-ton truck moving 90 km/hr D) a 1-ton truck moving 110 km/hr E) A, B, C, and D all have the same kinetic energy.