Polaris is a second magnitude star, and Phi Pegasi is about 16 times fainter than Polaris. What is the approximate magnitude of Phi Pegasi?
a. 18
b. ?14
c. 3
d. ?3
e. 5
e
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A cylindrical tank is assembled by welding steel sections circum-ferentially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pres-sure is 2.0 MPa. The maximum shear stress in the cylindrical part of the tank is approximately:
(A) 17 MPa
(B) 26 MPa
(C) 34 MPa
(D) 38 MPa
A steel wire in a piano has a length of 0.700 m and a mass of 4.30 grams. To what tension must this wire be stretched to make the fundamental frequency correspond to middle C, (fc = 261.6 Hz)?
Monochromatic light is incident on a metal surface and electrons are ejected. If the intensity of the light is increased, what will happen to the ejection rate and maximum energy of the electrons?
A) Greater rate; same maximum energy. B) Same rate; greater maximum energy. C) Greater rate; greater maximum energy. D) Same rate; same maximum energy.
An object is placed 5 cm to the left of a converging spherical lens. The lens has a focal length of f = 10 cm. What kind of image is formed and what is its orientation?
a. Real/Upright b. Virtual/Upright c. Virtual/Inverted d. Real/Inverted