Significant Figures: How many significant figures are in the number 0.010?
A. four
B. three
C. two
D. one
Answer: C
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Lens-Maker Formula: The curved surface of a 50-cm focal length plano-convex lens has a radius of curvature of 30 cm. What is the refractive index of the glass?
A. 1.6 B. 1.5 C. 1.4 D. 1.3
Jennifer is inside her windowless space station laboratory and finds herself increasingly pulled to the floor. What experiment can she perform inside the lab to decide if she is feeling the effect of an acceleration or an effect of gravity?
What will be an ideal response?
Which of the following could be a hypothesis for the function of the thick waxy coating of a pine needle
A. If the thick, waxy coating is destroyed, the pine needle will turn B. The thick, waxy coating prevents water loss C. What happens to the needle if the thick, waxy coating is brown. destroyed? D. The tree would feel cold without the thick, waxy coating
The greenhouse effect produces excess heat in a planet's atmosphere by
a. trapping infrared radiation from escaping into space. b. clouds blocking the surface from receiving any infrared radiation. c. preventing light gases from escaping into space. d. trapping ultraviolet light in the upper atmosphere of the planet.