When we subtract a velocity vector from another velocity vector, the result is:
a. another velocity.
c. a displacement.
b. an acceleration.
d. a scalar.
A
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The predictions of special relativity can sound implausible at first. Which of the following provide observational evidence that the theory is correct?
A) Subatomic particles in accelerators exhibit effects of time dilation and mass increase at high speeds. B) Light is always observed to travel at the same speed. C) Time dilation can be observed in airplanes. D) All of the above are correct.
If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length halved, what will happen to the overall magnification of the microscope?
a. This will result in no change in the magnification. b. The magnification quadruples. c. The magnification doubles. d. The magnification decreases.
The nucleus of the hydrogen atom consists of a single neutron
a. True b. False Indicate whether the statement is true or false
Galaxies with disks but no evident spiral arms are called
A) irregular galaxies. B) lenticular galaxies. C) barred spiral galaxies. D) spheroidal components.