The safest way to view an image of the Sun is to use
A) a telescope.
B) binoculars.
C) a pinhole.
D) colored sunglasses.
Answer: C
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A coil of 150 turns of wire is in the form of a circle, carries a current of 63 mA, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T. The torque on the coil has a maximum value of 0.25 Nm. What is the radius of the coils?
A. 9.2 cm B. 13 cm C. 0.56 cm D. 7.5 cm
Standing Sound Waves: A violin with string length 32 cm and string density 1.5 g/cm resonates in its fundamental with the first overtone of a 2.0-m organ pipe with one end closed and one end open. What is the tension in the string if the speed of sound in air is 344 m/s?
A. 1000 N B. 110 N C. 450 N D. 4100 N E. 56 N
American power plants usually supply 120 V ac
(a) At what frequency is this voltage supplied? (b) What is the maximum voltage?
The energy of an electron in the p-level of an atom is changed in the presence of a magnetic field of magnitude 4.6 T
What is the difference between the largest and smallest possible energies? (Bohr magneton = ?B = 9.27 × 10-24 J/T)