An object's weight is properly expressed in units of
A) meters.
B) kilograms.
C) newtons.
D) cubic centimeters.
Answer: C
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The maximum induced emf in a generator whose coils are rotating at 240 rpm is 35 V. If, instead, it is desired to generate a maximum emf of 45 V but with half the magnetic field, what rotation rate must be used?
A. 380 rpm B. 190 rpm C. 310 rpm D. 165 rpm E. 610 rpm
How much energy is in a 63 kHz photon of AM-radiation?
a. 1.0 × 10^-38 J b. 6.6 × 10^-30 J c. 4.2 × 10^-29 J d. 3.1 × 10^-30 J e. 13 × 10^-29 J
First Law of Thermodynamics: A sealed rigid tank contains 29 moles of an ideal gas, at an initial temperature of 270 K. The pressure of the gas is increased until the final pressure equals 1.90 times the initial pressure. The heat capacity at constant pressure of the gas is 24.0 J/mol ? K. How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ? K)
A. 110 kJ B. 170 kJ C. 230 kJ D. -52 kJ E. 7.0 kJ
The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 1 cm from this wire?
A) 2 ?T B) 4 ?T C) 6 ?T D) 8 ?T E) 10 ?T