A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg/°C.)
a. 9
b. 2
c. 5
d. 21
e. 0.5
c
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Conversion of Units: Wall posters are usually sold curled up in cylindrical cardboard tubes. If the length of the tube is 0.845 m, and the inside diameter of the tube is 2.40 mm, what is the area of the poster expressed in square centimeters to the correct number of significant figures? (Assume the poster is just as long as the tube and does not overlap itself.)
A. 202.8 cm2 B. 637.1 cm2 C. 203 cm2 D. 319 cm2 E. 637 cm2
The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?
A) 107° B) 90.0° C) 73.2° D) 54.7° E) 0.00°
A pair of narrow slits, separated by 1.8 mm, is illuminated by a monochromatic light source. Light waves arrive at the two slits in phase,
and a fringe pattern is observed on a screen 4.8 m from the slits. If there are 5.0 complete bright fringes per centimeter on the screen near the center of the pattern, what is the wavelength of the monochromatic light? A) 550 nm B) 600 nm C) 650 nm D) 700 nm E) 750 nm
What maximum power can be generated from an 18-V emf using any combination of a 6.0-? resistor and a 9.0-? resistor?
a. 54 W b. 71 W c. 90 W d. 80 W e. 22 W