A pure inductor is connected to an AC power supply. In this circuit, the current
A) leads the voltage by 90°.
B) is in phase with the voltage.
C) lags the voltage by 45°.
D) lags the voltage by 90°.
E) leads the voltage by 45°.
D
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An amusement ride consists of a car moving in a vertical circle on the end of a rigid boom. The radius of the circle is 10 m. The combined weight of the car and riders is 5.0 kN. At the top of the circle the car has a speed of 5.0 m/s which is not changing at that instant. What is the force of the boom on the car at the top of the circle?
a. 3.7 kN down b. 1.3 kN down c. 6.3 kN up d. 3.7 kN up e. 5.2 kN down
Find Brewster's angle for light in air that is reflected from the top of a water surface. The index of refraction of the water is 1.33
A) 53.1° B) 36.9° C) 56.3° D) 60.2° E) 90.0°
A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 7.1 W B) 0.71 mW C) 1.4 kW D) 9.9 mW E) 3.7 W
Which of the following best describes a hero image?
A. A large, banner-type image used primarily as the center image on a website's homepage. B. A lightly-colored watermark image used as a website template's background. C. A logo saved as text to avoid using an embedded font. D. An image to which you own the copyrights and can use without restriction.