A Jurassic dinosaur is approaching your vehicle and appears in the side-view mirror. It is larger than it appears in the mirror. This means that
A. its image size is smaller than what the flat rearview mirror shows.
B. it is inverted and real.
C. its image size is larger than what the flat rearview mirror shows.
D. it is a virtual image and inverted.
Answer: A
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The term "cosmic distance ladder" refers to the fact(s) that:
Select the ones that apply: a. change in apparent position of object on sky through Earths orbit, which gives a measure of distance. (p=1/D) b. Spectral classification of star, which gives luminosity.D*=Sq rt L/4pieB c. variable stars whose luminosity is related to their period.D*=Sq rt L/4pieB d. relation between a galaxy's rotation rate and luminosity. D*=Sq Rt Lg/4pieBg e. Exploding star whose luminosity can be determined by its light curve. Dg=SqRt Lsn/4pieBsn f. Relation between galaxies recession velocity and distance.D=V/H g. All of the above facts.
Suppose that the universe were infinite in both extent and age. In that case, we would expect the night sky to be
A) uniformly bright. B) much larger. C) filled with about 1,000 times as many stars. D) expanding at a more rapid rate.
The lowest layer of Earth's atmosphere is called the ________.
A. terrasphere B. ionosphere C. stratosphere D. ozone layer E. troposphere
At a distance of 10 km from a radio transmitter, the amplitude of the E field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?
A. 10 kW B. 67 kW C. 140 kW D. 245 kW E. 21 kW