State the relationship between frequency, photon energy, and wavelength
What will be an ideal response?
The higher the frequency, the greater the energy the photon carries, but the shorter its wavelength.
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Very large capacitors have been considered as a means for storing electrical energy. If we constructed a very large parallel-plate capacitor of plate area 10 m2 using paper (k = 3.7) of thickness 1.0 mm as a dielectric, how much electrical energy would it store at a plate voltage of 5000 V? (e0 = 8.85 × 10^-12 C2/N×m2)
a. 4.1 J c. 0.41 J b. 8200 J d. 82,000 J
At what rate is the gravitational force on a 2.0-kg projectile doing work at an instant when the velocity of the projectile is 4.0 m/s directed 30° above the horizontal?
a. +39 W b. -78 W c. -39 W d. +78 W e. +25 W
Which of the following objects is considered to possibly contain a black hole?
a. The central star of the Crab nebula b. The Orion nebula. c. LMC X-3 d. Algol e. PSR 1257+12
A 50.0-kg block is being pushed up a 15.0° slope by a force of 300 N which is directed 30.0° below the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A) 0.164 m/s2 B) 0.967 m/s2 C) 1.20 m/s2 D) 2.20 m/s2 E) 0.528 m/s2