Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The increase of potential energy of the box is __________
Fill in the blank(s) with correct word
100 J
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How many time constants must elapse if an initially charged capacitor is to discharge 55% of its stored energy through a resistor?
a. 0.60 b. 0.46 c. 0.52 d. 0.40 e. 1.1
If a = 30 cm, b = 20 cm, q = +2.0 nC, and Q = ?3.0 nC in the figure, what is the potential difference VA ? VB?
a.
+60 V
b.
+72 V
c.
+84 V
d.
+96 V
e.
+48 V
Which of the following substances has the greatest specific heat?
A. copper B. ice C. water D. steam E. Ice, water, and steam have equal specific heats since they are the same material, and this specific heat is greater than that of copper.
A monochromatic light source emits a wavelength of 403 nm in air. When passing through a liquid, the wavelength reduces to 363 nm. What is the liquid's index of refraction?
a. 1.23 b. 1.05 c. 1.11 d. 1.90 e. 1.81