A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V
b. 1.0 V
c. 6.8 V
d. 0.68 V
e. 1.4 V
b
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A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
A. the hoop B. the solid sphere C. the spherical shell D. the cylinder E. They all go the same distance up their inclines.
Two kilograms of water at 100°C is converted to steam at 1 atm. Find the change in internal energy (in J). (Lv = 2.26 × 10^6 J/kg.)
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How many different nucleotide bases are used in nucleic acids in life on Earth (consider both DNA and RNA)?
A) 25 B) 4 C) 20 D) 5
Assume the amplitude of the electric field in a plane electromagnetic wave is E1 and the amplitude of the magnetic field is B1. The source of the wave is then adjusted so that the amplitude of the electric field doubles to become 2E1. What happens to the intensity of the wave?
1.It becomes four times larger. 2.It becomes two times larger. 3.It can stay constant. 4.It becomes one-half as large. 5.It becomes one-fourth as large.