As measured from the Earth, a spacecraft is moving at speed 0.80c when it releases a probe at speed 0.60c relative to the spacecraft in a forward direction. What would be the speed of the probe as measured from the Earth?
a. 0.70c
c. c
b. 0.81c
d. 0.95c
D
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An extremely light rod 1.00 m long has a 2.00-kg mass attached to one end and a 3.00-kg mass attached to the other
The system rotates at a constant angular speed about a fixed axis perpendicular to the rod that passes through the rod 30.0 cm from the end with the 3.00-kg mass attached. The kinetic energy of the system is measured to be 100.0 J. (a) What is the moment of inertia of this system about the fixed axis? (b) What is the angular speed (in revolutions per second) of this system? What will be an ideal response?
When ice melts, its temperature
a. increases. b. decreases. c. stays constant. d. cannot be determined.
In the text there is a table of coefficients of linear (?) and volume (?) expansions due to temperature changes. For the solid materials in this list, there is a relationship between ? and ? which allows you to find the value of ? if you know ?. Which of the following best describes that relationship?
a. ? = ?3 b. 3? = ? c. ? = 3? d. ?3 = ?
The scientific method is most effective in
A) making hypotheses. B) gaining, organizing, and applying new knowledge. C) discovering new things. D) making theories. E) performing experiments.