How does sonar work?
a. It measures the speed of sound by timing how long it takes sound to travel.
b. It compares the speed of sound under different circumstances, by changing temperature or gas content.
c. It compares the frequencies of the emitted and reflected sound wave.
d. It measures the distance to underwater objects by bouncing sound waves off the objects.
e. It measures the distance to objects in the upper atmosphere by timing the speed of sound to those objects.
d
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Galaxy A and galaxy B formed at the same time. Galaxy A is much farther from us than galaxy B. Which of the following is true?
A) Galaxy A will appear younger to us than galaxy B. B) Galaxy A will appear older to us than galaxy B. C) Galaxy A will appear to be the same age as galaxy B.
If it were possible to move Earth so that its new orbit was twice as large as it is now, then the length of a year (in terms of the number of days) would also double.
Answer the following statement true (T) or false (F)
What are some observable consequences of the Earth's revolution around the Sun in relation to the zodiacal constellations?
What will be an ideal response?
An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A) zero. B) one-quarter of its weight on the surface of the earth. C) the same as on the surface of the earth. D) one-half of its weight on the surface of the earth. E) one-third of its weight on the surface of the earth.