How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?
a. 3.3 × 10^?6 J
b. 3.3 J
c. 0.003 J
d. 10?4 J
e. 3.0 × 10^5 J
a
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Projectile Motion: A hockey puck slides off the edge of a platform with an initial velocity of 20 m/s horizontally. The height of the platform above the ground is 2.0 m. What is the magnitude of the velocity of the puck just before it touches the ground? You can neglect air resistance.
A. 21 m/s B. 22 m/s C. 24 m/s D. 25 m/s E. 6.3 m/s
An AC voltage source, with a peak output of 72 V, results in dissipation of energy in a resistor at rate of 140 W. What is the value of the resistance?
a. 37 ? b. 26 ? c. 9 ? d. 19 ? e. 52 ?
•At the initial instant the universe contains
• (a) atoms (b) Protons (c) Electons (d) photons
The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 5 state?
A) 2.72 eV B) -2.72 eV C) 0.544 eV D) -0.544 eV E) None of the given answers are correct.