Which of these is NOT a form of electromagnetic radiation?
A) ultraviolet causing a suntan
B) DC current from your car battery
C) X-rays in the doctor's office
D) light from your camp fire
E) radio signals
B
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Three couples of equal magnitude (M0 5 100 N?m) are applied as shown. A single couple (in N?m) that is statically equivalent to the three couples is:
(A) 83.2i 2 89.4j
(B) 283.2i 1 89.4j
(C) 93.2i 1 79.4j
(D) 83.2i 1 89.4j
An object is dropped from rest on the planet Jupiter. At the end of 1 second, it has fallen 8 m and is moving at 16 m/s. At the end of two seconds the object's speed will be
A) 64 m/s. B) 48 m/s. C) 16 m/s. D) 32 m/s. E) None of the above.
A girl is standing in front of a concave mirror. Consider two rays of light, one from her nose and one from her mouth that are parallel as they are traveling toward the mirror. These rays will come together
a. at the focal point. b. at the center of curvature. c. at the image point. d. behind the mirror if she is too close to the mirror.
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