Which of the following wavelength regions cannot be studied at all with telescopes on the ground?
A) radio
B) infrared
C) x-rays
D) both radio and x-rays
E) both infrared and x-rays
C) x-rays
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A 2525 kg truck can be held up by a piston of radius 15 cm through a hydraulic lift by a force of 175 N on a piston of what radius?
A. 3.9 cm B. 1.04 cm C. 1.06 cm D. 1.26 cm
An ac generator consists of a coil with 50 turns of wire, each with an area of 0.02 m2. The coil rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 60 Hz and produces an average power of 50 W
What is the resistance of the coil? A) 150 ? B) 85 ? C) 2.4 ? D) 53 ? E) 227 ?
A hydrogen atom is in the 6h state. Which one of the following is not a magnetic quantum number?
A) 0 B) 1 C) 2 D) 4 E) 6
As the air cools at night the relative humidity usually drops
Indicate whether the statement is true or false