A 20.0 kg box slides down a 12.0 m long incline at an angle of 3.0 degrees with the horizontal. A force of 50.0 N is applied to the box to try to pull it up the incline. The applied force makes an angle of 0.00 degrees to the incline. If the incline has a coefficient of kinetic friction of 0.100, then the increase in the kinetic energy of the box is
A. 300 J.
B. 372 J.
C. 410 J.
D. 455 J.
E. 525 J.
B. 372 J.
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Light travels from inside a building to outside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. A 180o phase change occurs at the inside surface but not at the outside surface. b. A 180o phase change occurs at the outside surface but not at the inside surface. c. A 180o phase change occurs at both the inside surface and the outside surface. d. No phase change occurs at either the inside surface or the outside surface of the glass.
A radar signal bounces off your car and back to the antenna of a policeman's radar gun, checking for speeders. The radar gun can tell your speed of approach by "listening" for and measuring
A. a reflected signal at a higher frequency. B. a reflected signal at a lower frequency. C. a reflected signal with zero frequency. D. a reflected signal at the same frequency but polarized.
The total electromagnetic power emitted by the Sun is 3.8 ×1026 W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 1010 m?
A) 3 × 10-5 N/m2 B) 3 × 10-7 N/m2 C) 3 × 10-8 N/m2 D) 3 × 10-4 N/m2 E) 3 × 10-6 N/m2
A resting blood pressure of 140 over 90 or more is considered hypertension.
Answer the following statement(s) true (T) or false (F)