Which of the following studies is best suited to astronomical observations that fall into the category called timing?
A) studying how different planets differ in their surface compositions
B) studying how a star's brightness varies over a period of 3 years
C) measuring the rotation rate of a distant star
D) determining the age of the solar system
B
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A 120-? laboratory resistor is rated at 0.25 W. What is the safe current through the resistor?
A) 30 A B) 2.1 mA C) 22 mA D) 46 mA
In the case of a force varying with position, what feature of the graph of force vs. position represents the work done during a displacement?
1.the maximum force times the maximum position 2.the beginning force times the total displacement 3.the area under the curve 4.nothing
Thin Lenses: A slide projector is set up with its lens 6.0 m from the screen. The projected image on the screen is 1.5 m square for a slide (the object) that is 2.5 cm square.(a) How far is the slide from the lens?(b) What is the focal length of the projector lens?
Fill in the blank(s) with the appropriate word(s).
Saturn’s average density is less than water’s. Suppose Saturn were placed on a much larger planet made entirely of water. What would happen?
a. It would float. b. It would sink to the center of the water planet. c. It would be spread out due to the rotation of the water planet. d. It would merge into the water planet; denser materials sinking toward the core and lighter materials forming part of the atmosphere. e. There would be a devastating impact and Saturn would be torn apart to form a giant ring system around the water planet.