Young's Modulus: An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm. What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 Pa and for steel it is 2.0 × 1011 Pa.
Fill in the blank(s) with the appropriate word(s).
1.3 mm
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Magnetism is due to the motion of electrons as they
A) move around the nucleus. B) spin on their axes. C) both of these D) neither of these
One reason why we know that magnetic fields are not the same as electric fields is because the force exerted on a charge +q
a. is in opposite directions in electric and magnetic fields. b. is in the same direction in electric and magnetic fields. c. is parallel to a magnetic field and perpendicular to an electric field. d. is parallel to an electric field and perpendicular to a magnetic field. e. is zero in both if the charge is not moving.
The two stars in a binary star system have an angular separation of 1.0 × 10-5 rad
If the wavelength of the light from the system is 500 nm, what is the smallest diameter aperture telescope that could just resolve this system to show that it contains two stars? A) 0.50 cm B) 0.61 cm C) 5.0 cm D) 6.1 cm
Simple Pendulum: If both the mass of a simple pendulum and its length are doubled, the period will
A. be unchanged.
B. increase by a factor of 2.
C. increase by a factor of 4.
D. increase by a factor of 
.
E. increase by a factor of 1/
.