Why is the angular magnification of a microscope negative?
A. The image is smaller than the object.
B. The image is inverted.
C. The focal length is negative
D. The eyepiece focal length is less than the objective focal length.
Ans: B. The image is inverted.
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Observational evidence tells you that as a nova explosion begins, _____
A) a cloud of debris ejects into space B) matter settles inward onto the surface of a white dwarf and forms a layer of unused nuclear fuel C) dense gas comes toward you at a few thousand kilometers per second D) the spectral lines change to emission lines
A 0.80-kg object tied to the end of a 2.0-m string swings as a pendulum. At the lowest point of its swing, the object has a kinetic energy of 10 J. Determine the speed of the object at the instant when the string makes an angle of 50° with the vertical
a. 5.6 m/s b. 4.4 m/s c. 3.3 m/s d. 5.0 m/s e. 6.1 m/s
What is the difference between intrusive and extrusive igneous rocks?
What will be an ideal response?
Mercury is very hard to observe from Earth because:
A) it always appears as only half lit from Earth. B) it never gets more than 28 degrees from the Sun's glare. C) its elliptical orbit causes it to change speed unpredictably. D) its barren surface reflects too little sunlight; it is almost invisible always. E) its very rugged surface does not allow radar to bounce back to Earth.