The volume of a 10-mL test tube is equivalent to which one of the following quantities?
A) 0.01 L
B) 0.001 kL
C) 0.1 L
D) 1 × 10-6 L
E) 0.001 ML
A
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Which of the following claims cannot be tested by science?
A) The Earth was created by God. B) The Sun goes around the Earth. C) The geometry of the universe is curved. D) This drug will cure cancer. E) Smoking shortens people's lifespans.
Center of Mass: A 1.0-g bead is at (-2.0 cm, 2.0 cm), a 2.0-g bead is at (2.0 cm, -4.0 cm), and a 3.0-g bead is at (2.0 cm, 0.0 cm). What are the coordinates of the center of mass (or center of gravity) of this system of beads?
Fill in the blank(s) with the appropriate word(s).
A radiation source is to be built, as shown in the diagram, for an experimental study of radiation. The base of the hemisphere is to be covered by a circular plate having a centered hole of radius R/2. The underside of the plate is to be held at 555 K by heaters embedded in its surface. The heater surface is back. The hemispherical surface is well-insulated on the outside. Assume gray diffuse processes and uniform distribution of radiation. (a) Find the ratio of the radiant intensity at the opening to the intensity of emission at the surface of the heated plate. (b) Find the radiant energy loss through the opening in watts for R = 0.3 m. (c) Find the temperature of the hemispherical surface.
GIVEN
• A radiation source as shown above
• Radius of hole = R/2
• Temperature of underside of plate (T2) = 555 K
• Underside of plate is black
• Hemispherical surface is well insulated on the outside
FIND
(a) The ratio of the radiant intensity at the opening to the intensity at the surface of the heated plate (G1/ Eb2)
(b) The radiant energy loss through the opening (q1) in watts for R = 0.3 m
(c) The temperature of the hemispherical surface (T3)
ASSUMPTIONS
• Gray diffuse processes
• Uniform distribution of radiation
• Radiation entering A1 is negligible, i.e., A1 as a black body at 0 K Heat loss through insulation is negligible
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
If the plane of the Earth's equator were not tilted with respect to the ecliptic plane
a. the daylight period of Earth would be the same year-round. b. there would be no seasonal changes. c. Earth's poles would not experience six month long nights. d. All of the above