A particle (charge 7.5 ?C) is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-?C charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?
a. 3.0 J
b. 1.8 J
c. 2.4 J
d. 1.2 J
e. 1.4 J
d
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Which fact about Mars is NOT true?
a) There are giant volcanoes on Mars, larger than any on Earth. b) There was once water on the surface of Mars. c) The Viking spacecraft landed on Mars in 1976. d) It is always colder than freezing on Mars surface. e) Mars has a thicker atmosphere than Earth does.
Derive an expression for the temperature distribution in an infinitely long rod of uniform cross section within which there is uniform heat generation at the rate of 1 W/m. Assume that the rod is attached to a surface at Ts and is exposed through a convective heat transfer coefficient h to a fluid at Tf.
GIVEN
• An infinitely long rod with internal heat generation
• Temperature at one end = Ts
• Heat generation rate ( q
GA) = 1 W/m
• Convective heat transfer coefficient = hc
• Ambient fluid temperature = Tf
FIND
• Expression for the temperature distribution
ASSUMPTIONS
• The rod is in steady state
• The thermal conductivity (k) is constant
SKETCH
Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.40). How thick is the bubble (in nm) if destructive interference occurs in the reflected light?
A. 102 B. 179 C. 54 D. 1 E. 89
Explain why leaves and plants are the colors they are, not black or white
What will be an ideal response?