Refracting Telescope: You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16.0 cm. If you could use any two of these lenses to build a telescope, what is the maximum magnification you could achieve for comfortable viewing of a planet?
A. 2.0
B. 4.0
C. 6.0
D. 8.0
Answer: D
You might also like to view...
A model car is propelled by a cylinder of carbon dioxide gas. The cylinder emits gas at a rate of 4.5 g/s with an exit speed of 80.0 m/s. The car has a mass of 200 g, including the CO2 cylinder. Starting from rest, what is the car's initial acceleration?
a. 0.90 m/s2 c. 9.0 m/s2 b. 1.8 m/s2 d. 36 m/s2
A car has a mass of 2,000 kg and travels at 20.0 m/s. If the drag force is 100 N, the power the engines have to provide to keep moving at constant speed is
A. 2.0 kW. B. 2.9 kW. C. 3.4 kW. D. 3.9 kW. E. 4.2 kW.
A superconducting wire carries a current of 104 A. Find the magnetic field at a distance of 0.25 m from the wire. (µ0 = 4p × 10^-7 T×m/A)
a. 1.6 × 10^-2 T c. 8 × 10^-3 T b. 2 × 10^-3 T d. 3.2 × 10^-2 T
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 
acquires an angular velocity of 5.00 rad/sec. The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the angular distance traveled by a point 4.00 cm from the center, at the time 10.0 seconds from the start?
A. 20.8 radians B. 26.3 radians C. 37.5 radians D. 41.6 radians E. 47.3 radians