That Earth ___________, evidence that Earth differentiated
a. rotates slowly
b. has an average density that is higher than the density of the crust
c. has a no magnetic field
d. has a surface that is 75% water
e. all of these
b
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Which of the following statements about the greenhouse effect is true?
A) Without the naturally occurring greenhouse effect, Earth would be too cold to have liquid oceans. B) A weak greenhouse effect operates on Mars. C) The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide. D) One result of an increased greenhouse effect on Earth may be an increased number of severe storms. E) All of the above are true.
Samantha pushes a 60-N crate up a ramp 20.0 m in length and inclined at 10° with the horizontal. What potential energy change does the crate experience?
a. 1200 J c. 600 J b. 210 J d. 300 J
Compound Microscope: The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity. The near point of the microscope user is at 25 cm. What is the distance between the object and the focal point of the objective lens?
A. 0.13 mm B. 0.18 mm C. 0.23 mm D. 0.28 mm E. 0.33 mm
A student constructs an astronomical telescope and wishes it to have a magnification of 10. If the telescope has an objective lens of focal length 0.50 m, what must be the focal length of the eyepiece?
A) 2.5 cm B) 5.0 cm C) 10 cm D) 25 cm