A neutron has a mass of 1.67 × 10^?27 kg. Its de Broglie wavelength is 1.4 × 10^?10 m. What is its kinetic energy (in eV)?
a. 4
b. 0.4
c. 0.04
d. 40
e. 0.08
c
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Series/Parallel Circuits: Two 100-W light bulbs of fixed resistance are to be connected to an ideal 120-V source. What are the current, potential difference, and dissipated power for each bulb when they are connected(a) in parallel (the normal arrangement)?(b) in series?
What will be an ideal response?
A blacksmith is flattening a steel plate, 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75, what is the total rate of radiation of energy?
The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2?K4). Ignore heat exchange with the surroundings. A) 360 W B) 760 W C) 790 W D) 850 W E) 880 W
When a substance is exposed to something that has a lower temperature,
a. work is done on it b. work is done by it c. heat is transferred from it d. heat is transferred to it e. none of the above
Air within the funnel of a large tornado may have a pressure of only 0.2 ATM. What is the approximate outward force on a (5 m × 10^ m) wall if a tornado suddenly envelops the house? (1 ATM = 1.01 × 10^5 N/m2.)
a. 4 × 10^3 N b. 4 × 10^4 N c. 4 × 10^5 N d. 4 × 10^6 N e. 7 × 10^5 N