Supernovas are thought to always result in
A)
neutron stars.
B)
red giant stars.
C)
regular stars like our Sun.
D)
white dwarfs.
E)
black dwarfs.
A
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Two mechanical waves meet and coincide. One wave has a positive displacement from the equilibrium position, and the other wave has a negative displacement. What kind of interference occurs?
a. constructive b. destructive c. complete constructive d. none
About 90% of the star's total life is spent on the main sequence
Indicate whether the statement is true or false
An object is placed 21 cm from a concave lens of focal length 25 cm. What is the magnification?
A) -0.54 B) 0.54 C) -0.32 D) -0.22 E) 0.22
The unit of work, joule, is dimensionally the same as:
a. newton/second. c. newton-second. b. newton/kilogram. d. newton-meter.