Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is:
a. 4.0 cm.
c. 16 cm.
b. 9.8 cm.
d. 20 cm.
D
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Most of the galaxies in the Local Group are
A) small spirals like M33 and the LMC. B) active galaxies like Centaurus A. C) small ellipticals like the companions to M31 in Andromeda. D) big spirals like our Galaxy and M31. E) small irregulars like the Magellanic Clouds.
The ____ of an object is a measure of the amount of matter it contains. The ____ is a measure of the gravitational force on an object
a. weight; mass b. mass; weight c. energy; force d. force; energy e. momentum; energy
Nearly all the elements found in nature were formed inside stars, EXCEPT for
A) carbon and silicon. B) hydrogen and helium. C) helium and carbon. D) silver and technetium. E) uranium and radium.
Name five different types of radiation detectors
What will be an ideal response?