_______________ are fossilized remains of colonies of single-celled organisms that built uplayer after layer of trapped sediments.?
Fill in the blank(s) with the appropriate word(s).
Answer: Stromatolites
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A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
a. 0; 0. b. 0; 2.38 m/s, south. c. 0; 2.38 m/s, north. d. 1 000 m, south; 2.38 m/s, south. e. 1 000 m, north; 2.38 m/s, north.
Dimensional Analysis: When dividing several quantities
A. the quantities can have any combination of units. B. the quantities must all have exactly the same units. C. the quantities must all be dimensionless.
Index of Refraction: Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. What are the frequency and wavelength of the light in this liquid? (c = 3.0 × 108 m/s)
What will be an ideal response?
Suppose that a car traveling to the west (the -x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration in the x direction is correct?
A) Both its acceleration and its velocity are positive. B) Both its acceleration and its velocity are negative. C) Its acceleration is positive but its velocity is negative. D) Its acceleration is negative but its velocity is positive.