Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that approaches mirror 1 is parallel to mirror 2 . The angle of reflection of that ray from mirror 1 is
a. 0°.
b. 30°.
c. 60°.
d. 90°.
e. 120°.
c
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A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The inside wall is to be covered by a layer of wood in order to reduce the rate of heat flow through the wall by 90 percent
The inner surface of the wooden wall is maintained at -10°C and the outer surface of the concrete wall is at 20°C. The thermal conductivities of concrete and wood are 0.80 W/m ? K (concrete) and 0.040 W/m ? K (wood). What should be the thickness of the layer of wood? A) 100 mm B) 90 mm C) 60 mm D) 70 mm E) 80 mm
A key piece of evidence that leads astronomers to conclude that most galaxies include a supermassive black hole in the center is that ____
a. high-speed disks of gas are observed in the central parsecs of other galaxies b. streamers of gas from stars that have been torn apart are detected in most galactic centers c. stars near the center of other galaxies are orbiting more rapidly than expected d. the mass of all galaxies is much more than expected based on the visible material in the galaxy e. the disks of all spiral galaxies rotate more quickly than Kepler's laws predict
When a rock thrown straight up reaches the exact top of its path, its velocity is
A) zero and its acceleration is zero. B) zero and its acceleration is 10 m/s2. C) about 10 m/s and its acceleration is zero. D) about 10 m/s and its acceleration is 10 m/s2.
What is meant by ‘net charge?'
a. the total amount of positive charge on an object b. the total amount of negative charge on an object c. the total amount of neutral charge on an object d. A minus B