We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from
A) sending spacecraft to study the planets up close.
B) examining spectral lines from the atmospheres of distant planets.
C) examining high-resolution images of the planets made by orbiting telescopes.
D) determining the orbital properties of the planets.
B
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The acceleration of an object as a function of time is given by a(t) = (3.00 m/s3 )t, where t is in seconds
If the object is at rest at time t = 0.00 s, what is the velocity of the object at time t = 6.00 s? A) 18.0 m/s B) 54.0 m/s C) 0.00 m/s D) 15.0 m/s E) 108 m/s
A spaceship approaches Earth with a speed 0.50c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to Earth?
A) 73 beats per minute B) 61 beats per minute C) 75 beats per minute D) 65 beats per minute E) 69 beats per minute
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is (in dB)
A. 98.5. B. 92.0. C. 91.5. D. 89.6. E. 88.3.
Which is the correct order of the planets, moving from closest to the Sun to farthest from the Sun?
a. Mercury, Venus, Earth, Saturn, Mars, Jupiter, Neptune, Uranus b. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune c. Venus, Mercury, Mars, Earth, Saturn, Jupiter, Neptune, Uranus d. Mars, Venus, Earth, Mercury, Jupiter, Saturn, Uranus, Neptune e. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus