Lens-Maker Formula: A double-concave lens has equal radii of curvature of magnitudes 15.1 cm. An object placed 14.2 cm from the lens forms a virtual image 5.00 cm from the lens. What is the index of refraction of the lens material?
A. 1.98
B. 2.06
C. 1.90
D. 1.84
Answer: A
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At an airport, luggage is unloaded from a plane into the three cars of a luggage carrier, as the drawing shows. The acceleration of the carrier is 0.12 m/s2, and friction is negligible. The coupling bars have negligible mass. By how much would the tension in each of the coupling bars A, B, and C change if 39 kg of luggage were removed from car 2 and placed in (a) car 1 and (b) car 3?
A person can see well close up, but cannot do so in the distance. To correct this, lenses that are _____ having a _____ refractive power could be used
a. thicker at their center than at the edges, positive b. thicker at their center than at the edges, negative c. thinner at their center than at the edges, negative d. thinner at their center than at the edges, positive
The height of the quasar epoch was
A) less than 1 billion years ago. B) when there was still sufficient mass to fuel the supermassive black holes at their center. C) before the formation of galaxies. D) 5 billion years ago. E) before mass had a chance to accumulate at the nucleus.
A 5.00 kg object has a moment of inertia of 1.20 kg 
What torque is needed to give the object an angular acceleration of 2.0 
A. 2.4 N•m B. 2.6 N•m C. 2.8 N•m D. 3.0 N•m E. 3.2 N•m