A 4 500-N weight is suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, T1 . Cable 2 applies a force upward and to the left at an angle of 37.0° to the negative x-axis and has a tension, T2 Find T2
a. 6.0E+3 N
b. 2.7E+3 N
c. 7.5E+3 N
d. 5.6E+3 N
e. 3.6E+3 N
c
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Clusters of galaxies are distributed in space ____
a. homogenously b. isotropically c. in long, narrow filaments surrounding empty voids d. statically e. in bubbles surrounded by empty walls
For an ideal radiator (hohlraum) with a 10-cm-diameter opening, located in black surroundings at 16°C, (a) calculate the net radiant heat transfer rate for hohlraum temperatures of 100°C and 560°C, (b) the wavelength at which the emission is a maximum, (c) the monochromatic emission at ?max, and (d) the wavelengths at which the monochromatic emission is 1 per cent of the maximum value.
GIVEN
• An ideal radiator (hohlraum) in black surroundings
• Radiator opening diameter (D) = 10 cm = 0.1 m
• Surrounding temperature (Ts) = 16°C = 289 K
• Hohlraum temperatures
- Th1 = 100°C = 373 K
- Th2 = 560°C = 833 K
FIND
(a) The net radiant heat transfer rate (qr)
(b) The wavelength at which the emission is maximum (?max)
(c) The monochromatic emission at ? max (E?max)
(d) The wavelengths at which the monochromatic emission is 1% E?max
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
A 3.0-kg and a 5.0-kg box rest side-by-side on a smooth, level floor. A horizontal force of 32 N is exerted on the 5.0-kg box pushing it against the 3.0-kg box, and, as a result, both boxes slide along the floor
How hard do the two boxes push against each other? A) 12 N B) 20 N C) 24 N D) 32 N E) 0 N
A total solar eclipse will be visible from the same location on Earth one Saros cycle later
a. True b. False Indicate whether the statement is true or false