If an optical system consists only of an object and a single convex mirror,
a. the image will sometimes be inverted.
b. the magnification will sometimes have an absolute value greater than 1.
c. the image distance will never be negative.
d. the image will always be virtual.
d
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Which of the following is not a characteristic of superplasticity?
(a) Grains elongate in the direction of flow. (b) Temperatures are above half of the melting temperature. (c) The material is highly strain-rate sensitive. (d) A strain rate of approximately 10-3 s-1.
Is the specified change in the following objects’ thermal energies due to a flow of heat (A), work (B), or some other flow of energy (E)?
(a) A hot cup of tea on a table becomes cooler with time. (b) A meteorite entering the atmosphere becomes hot. (c) Liquid nitrogen poured on a slab of ice boils furiously. (Liquid nitrogen’s boiling point is 77 K.) (d) Infrared laser light falling on a metal slab makes it hot. (e) A drill bit gets hot as it drills a hole in a metal slab.
Which of the following best explains why sweating is important to humans in maintaining suitable body temperature?
A) Functioning of the sweat gland absorbs energy that otherwise would go into heating the body. B) The high specific heat of water on the skin absorbs heat from the body. C) Evaporation of moisture from the skin extracts heat from the body. D) Moisture on the skin increases thermal conductivity, thereby allowing heat to flow out of the body more effectively.
A satellite orbits the Earth once every 6.0 hours in a circle. What is the radius of the orbit if it is a 2000. Kg satellite?
What will be an ideal response?