The heating of a room by a fire in a fireplace is chiefly due to
a. vaporization.
b. radiation.
c. convection.
d. conduction.
b
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What is the direction of the angular momentum vector for a wheel spinning as shown below?
A. Upward
B. Downward
C. Clockwise
D. Counterclockwise
High mass stars are typically found on the ________ of the main sequence
A) upper right B) lower left C) upper left D) lower right E) center
Find the frequency of x-rays of wavelength 1.75 × 10^?10 m. (c = 3 × 10^8 m/s)
a. 1.71E+12 Hz b. 3.43E+19 Hz c. 1.71E+18 Hz d. 3.43E+9 Hz e. 4.29E+14 Hz
Lens-Maker Formula: As part of a piece of optical apparatus to be used in air, you need to design a thin lens having faces with radii of curvature of magnitude 24 cm each. When an object 32 mm tall is placed 30 cm from this lens, it must form a real image 60 cm from the lens.(a) What must be the index of refraction of the lens material?(b) What is the height of the image of the object? Is it upright or inverted; is it real or virtual?
What will be an ideal response?