The Doppler effect states that the motion of any object can
a. shift the wavelength of spectral lines.
b. change the speed of light emitted from the object.
c. enhance the chemical composition of the object.
d. make the object appear hotter.
e. make the object appear cooler.
A
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If the net work W is done on an object is negative, the object's kinetic energy increases by an amount W
Indicate whether the statement is true or false
Why would it not be a good idea to send a lander to one of the jovian planets?
A) The jovian planets have no solid surface to land on. B) The jovian planets are too far away. C) It would be impossible to slow the lander down sufficiently to avoid a catastrophic crash. D) There's too much risk of hitting a boulder in the planet's rings on the way down. E) There is nothing interesting to find on the jovian planets.
An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of
A) 60 km/h. B) 80 km/h. C) 100 km/h. D) 141 km/h.
If a flower is 6.5 cm wide, its width expressed in millimeters is x mm, where x is
A) less than 6.5. B) greater than 6.5.