A radioactive isotope is
A) an unstable nucleus that gives off radio waves
B) a nucleus that formed from the fusion of two other nuclei
C) a stable nucleus that is formed from the fission of a large unstable nucleus
D) an unstable nucleus that spontaneously breaks apart
D
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____ has a negative charge and a mass about 1800 times small than a proton
a. A neutron b. An electron c. A molecule d. A nucleus e. An isotope
A train slowly climbs a 400-m mountain track which is at an angle of 8.0° with respect to the horizontal. How much altitude does it gain?
a. 55.7 m b. 200 m c. 60.7 m d. 396 m e. 400 m
The velocity needed to stay in a round orbit is called the__________
A) circular velocity B) linear velocity C) vertical velocity D) horizontal velocity
Ohmic heating is
a. always undesirable. b. used in light bulbs. c. what makes fuses "blow". d. all of the above.