Which of these things did Galileo NOT do?
a. Make up a thought experiment that indicated that objects would fall at the same rate.
b. Invent the concept of acceleration.
c. Stop publishing his scientific work after being convicted of heresy.
d. Experiment with rolling balls down ramps of increasing steepness to test how objects would fall.
e. Argue that Earth moves around the Sun.
c
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How are astronomers able to determine that quasars are so small?
a. They are variable over a short period of time. b. They emit mainly X-rays. c. They are only found at very large distance. d. The structure of a quasar is completely resolved in images.
Resistors in Combination: What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.
A. 950 ? B. 450 ? C. 392 ? D. 257 ?
A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force exerted on the car by the road?
A) tangent to the curve in the forward direction B) tangent to the curve opposite to the direction of the car's motion C) perpendicular to the curve outward D) perpendicular to the curve inward E) There is no friction on the car because its speed is constant.
At approximately what temperature does water have its greatest density?
a. 4°C b. 100°C c. 0°C d. None of these; the density of water is constant at all temperatures.