A uniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. What is its kinetic energy?
A) 0.18 J
B) 0.092 J
C) 0.96 J
D) 1.1 J
E) 17 J
B
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From lowest frequency to highest frequency, which of the following correctly orders the different regions of electromagnetic radiation?
A) infrared, visible light, ultraviolet, x-rays, gamma rays, radio B) radio, infrared, visible light, ultraviolet, x-rays, gamma rays C) visible light, infrared, x-rays, ultraviolet, gamma rays, radio D) gamma rays, x-rays, visible light, ultraviolet, infrared, radio E) Radio, x-rays, visible light, ultraviolet, infrared, gamma rays
Why are reflecting telescopes cheaper to build than refracting telescopes?
What will be an ideal response?
The critical part of the atmosphere for protecting life on the ground from excessive ultraviolet radiation is the
A) hydrosphere. B) troposphere. C) ozone layer. D) stratosphere. E) ionosphere.
Two point charges each have a value of 30.0 mC and are separated by a distance of 3.00 cm. What is the electric field midway between the two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 40.5 × 10^7 N/C c. zero b. 20.3 × 10^7 N/C d. 10.1 × 10^7 N/C