The motion of a particle connected to a spring is described by x = 10 sin (?t). At what time (in s) is the potential energy equal to the kinetic energy?
a. 0
b. 0.25
c. 0.50
d. 0.79
e. 1.0
b
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An incompressible ideal fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?
A) 0.32 m/s B) 0.64 m/s C) 1.3 m/s D) 2.6 m/s E) 5.1 m/s
Considering only the role of dark energy and keeping all other factors the same, which hypothetical universe is oldest?
A) the one with more dark energy B) the one with less dark energy C) Dark energy doesn't affect the inferred age of the universe.
An x ray can be emitted when an electron undergoes an energy level transition
Indicate whether the statement is true or false
The resolution of a 10-meter telescope is about 0.01 arcsecond for visible light. Would you expect the angular resolution of a 10-meter radio telescope to be better than, equal to, or worse than 0.01 arcsecond? Explain
What will be an ideal response?