Which becomes warmer in sunlight, sunglasses or clear reading glasses?
A) sunglasses.
B) reading glasses.
C) both of these
D) none of the above
Answer: A
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When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
A. Its length is decreased and its height is increased. B. Its length is decreased and its height is decreased. C. Its length is decreased and its height is unchanged. D. Its length is unchanged and its height is increased. E. Its length is increased and its height is decreased.
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 25.0° with a speed of 30.0 m/s. The coefficient of static friction between the car and the road is 0.300
What is the force exerted by friction on the car? A) 1590 N B) 3430 N C) 7240 N D) 7820 N E) 795 N
An object weighing 44.1 N hangs from a vertical massless ideal spring. When set in vertical motion, the object obeys the equation y(t) = (6.20 cm) cos[(2.74 rad/s)t - 1.40]. (a) Find the time for this object to vibrate one complete cycle
(b) What are the maximum speed and maximum acceleration of the object? (c) What is the TOTAL distance the object moves through in one cycle? (d) Find the maximum kinetic energy of the object. (e) What is the spring constant of the spring?
Light not only has wavelike properties, but also has particle-like properties. What are these "particles" of light called?
a. quarks c. photons b. wavicles d. etherons