A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ?, what is the magnitude of the induced current?
a. 0.70 A
b. 0.60 A
c. 0.50 A
d. 0.80 A
e. 0.20 A
c
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In a part of a printing press, a roller with a radius of 10 cm, rolls without slipping on the outside of a fixed cylinder with a radius of 30 cm. There is a connecting rod that connects the center of the cylinder to the axle of the roller
If the angular speed of the roller is 60 rad/s, what is the angular speed of the connecting rod? A) 15 rad/s B) 20 rad/s C) 120 rad/s D) 150 rad/s E) 180 rad/s
Refracting Telescope: You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16.0 cm. If you could use any two of these lenses to build a telescope, what is the maximum magnification you could achieve for comfortable viewing of a planet?
A. 2.0 B. 4.0 C. 6.0 D. 8.0
In a large tank of liquid, the hydrostatic pressure at a given depth is a function of:
a. depth. c. liquid density. b. surface area. d. Choices a and c are both valid.
Tectonic plates are composed of the
A) crust and mantle. B) lithosphere. C) lithosphere and the asthenosphere. D) crust.