Molecular Speeds: What is the total translational kinetic energy of the gas in a classroom filled with nitrogen at 1.01 × 105 Pa at 20.7°C? The dimensions of the classroom are 4.60 m × 5.20 m × 8.80 m. The Boltzmann constant is 1.3806503 × 10-23 J/K, R = 8.31 J/mol ? K, and NA = 6.022 × 1023 molecules/mol.
Fill in the blank(s) with the appropriate word(s).
3.19 × 107 J
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A 20.0 kg mass is attached to the end of a 1.00 m steel rod with a 1.00 mm diameter. If the tensile modulus of steel is 
then the frequency of the simple harmonic motion of the mass is
A. 37.2 Hz. B. 30.4 Hz. C. 24.5 Hz. D. 20.1 Hz. E. 14.1 Hz.
A copper cable needs to carry a current of 200 A with a power loss of only 1.5 W/m. What is the required radius of the copper cable? (The resistivity of copper is 1.7 × 10^-8 W×m.)
a. 4.0 cm c. 0.85 cm b. 0.21 cm d. 1.2 cm
If a quantity is conserved, it means that it
Choose one: A. can be saved for a later time. B. changes only if an external force acts. C. changes only if an internal force acts. D. it doesn't change.
An ideal solenoid is 18.5 cm long, has a circular cross-section 2.20 cm in diameter, and contains 545 equally spaced thin windings
This solenoid is connected in a series circuit with an open switch, a 15.0-? resistor, and a battery of internal resistance 5.00 ? and open-circuit terminal voltage of 25.0 V. (?0 = 4? × 10-7 T ? m/A) (a) What is the maximum amount of energy that the solenoid will store after closing the switch? (b) How long after closing the switch will it take for the stored energy in the solenoid to reach one-half of its maximum value? What will be an ideal response?