Abuoyant force acts in the opposite direction of gravity. according to archimedes’ principle, which of the following is true of an object completely submerged in water?

a. the magnitude of the upward buoyant force on the object is smaller than the weight of the fluid displaced by the object.
b. the magnitude of the upward buoyant force on the object is greater than the weight of the fluid displaced by the object.
c. the magnitude of the upward buoyant force on the object is equal to the weight of the fluid displaced by the object.
d. the object appears to weigh more than it does in air.

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

If forces acting on an object are unbalanced. true or false