Magnetism had been a known phenomenon for some time before its relation to electric currents was found. That a current in a wire produces a magnetic field was discovered by:
a. Ampere.
c. Ærsted. b. Maxwell.
d. Tesla.
C
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Write the Laplace equation for two-dimensional conduction heat transfer through a homogeneous, isotropic material that has constant thermal conductivity.
What will be an ideal response?
The extreme size of volcanoes on Mars indicates that
a. Mars has a much thicker crust than Earth. b. water once flowed in streams on Mars. c. large moving plates have not formed on Mars. d. a and c e. a, b, and c
An alpha particle (mass = 6.68 × 10^?27 kg) is emitted from a radioactive nucleus with a kinetic energy of 4.55 MeV. How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10^?13 J)
a. 3.84E+3 m/s b. 1.48E+7 m/s c. 1.04E+7 m/s d. 3.82E+7 m/s e. 5.11E+6 m/s
How much thermal energy is required to raise the temperature of a 225-g lead ball from 15.0°C to 25.0°C? The specific heat of lead is 128 J/kg ? K
A) 725 J B) 576 J C) 145 J D) 217 J E) 288 J