A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
a.
.
b.
R.
c.
c
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The Sun converts mass to energy through the proton-proton chain.
Answer the following statement true (T) or false (F)
Comparing the light from a glowing tube of neon gas and the beam of a helium-neon laser, there is a greater number of spectral lines in light from the
A) neon gas tube. B) laser beam. C) both about the same
A uniform piece of wire, 20 cm long, is bent in a right angle in the center to give it an L-shape. How far from the bend is the center of mass of the bent wire?
A) 2.5 cm B) 3.5 cm C) 4.5 cm D) 5.0 cm E) 7.1 cm
A 20-kg piece of aluminum (which has a specific heat of 900 J/kg • °C) is warmed so that its temperature increases by 5.0°C. How much heat was transferred into it?
a. 4.5 × 10^4 J c. 1.4 × 10^5 J b. 9.0 × 10^4 J d. 2.0 × 10^5 J