A 755 N box rests on a floor with a coefficient of kinetic friction of 0.600 and a coefficient of static friction of 0.800. What horizontal force is required to start the box moving?
A. 755 N
B. 453 N
C. 254 N
D. 653 N
E. 604 N
E. 604 N
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Which of the following stars is reddish in color?
A. F6 B. A0 C. K9 D. G5 E. B2
Which part of the electromagnetic spectrum has the shortest wavelength?
A) radio B) infrared C) ultraviolet D) visible E) gamma
A uniform rod (mass = 1.5 kg) is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a horizontal position. What is the angular speed of the rod when the rod makes an angle of 30° with the horizontal? (The rotational inertia of the rod about the pin is 2.0 kg/m2)
a. 2.2 rad/s b. 3.6 rad/s c. 2.7 rad/s d. 3.1 rad/s e. 1.8 rad/s
In the unified model, an accretion disk viewed from the side will cause ____ to be present in the spectrum of a Seyfert galaxy
a. narrow absorption lines b. broad absorption lines c. narrow spectral lines d. broad emission lines e. no absorption lines