In a converging lens, objects infinitely far away are focused
A) in front of the focal point.
B) at the focal point.
C) beyond the focal point.
Answer: B
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Consider the "dead end" element for cores of massive stars. Why is that element the "dead end"?
A) It has the highest nuclear mass. B) It can only release energy by fission. C) It has the highest mass per nuclear particle. D) It has the lowest nuclear mass. E) It can only release energy by fusion. F) It has the lowest mass per nuclear particle.
A 2.0-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 250 N/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.6 m/s and first comes to rest at a displacement of 0.20 m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?
a. 0.32 b. 0.45 c. 0.58 d. 0.19 e. 0.26
________ used the extensive records of planetary positions measured by ________ to discover that the orbits of the planets are ________.
A. Kepler; Galileo; elliptical B. Kepler; Tycho; elliptical C. Tycho; Kepler; elliptical D. Tycho; Kepler; circular
Internal forces cannot change the total kinetic energy of a system
Indicate whether the statement is true or false