Which of the following is not a component of a stream's load?
a. Mother load
b. Dissolved load
c. Suspended load
d. Bed load
a
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If we say that a galaxy has a lookback time of 1 billion years, we mean that
A) its light traveled through space for 1 billion years to reach us. B) it is now 1 billion light-years away. C) it was 1 billion light-years away when the light left the galaxy. D) it is 400 million years old.
If the sum of both the external torques and the external forces on an object is zero, then the object must be at rest
A) True B) False
Which of the following statements best describes the difference between a refracting telescope and a reflecting telescope?
A) A refracting telescope uses a transparent glass lens to focus light, whereas a reflecting telescope uses a mirror to focus light. B) A refracting telescope produces refracted images, whereas a reflecting telescope produces reflected images. C) Reflecting telescopes make much clearer images than refracting telescopes of the same size. D) It is much easier to make a large refracting telescope than a large reflecting telescope.
Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight. b. the tension in the rope is equal to her mass times her acceleration. c. her acceleration is downward at 9.8 m/s2. d. none of the above.