The work that a force does by acting on an object is equal to:
a. the product of force (in the direction of motion) and distance and is positive if the force and motion are in the same direction.
b. the product of force (in the direction of motion) and distance and is negative if the force and motion are in the same direction.
c. the product of force and distance without regard to direction.
d. the product of momentum and force (in the direction of motion).
e. the product of distance and kinetic energy.
a
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Microfossils are
A) fossilized microbes B) the remains of very small dinosaurs C) the remains of the very first multicellular organisms D) the remains of the tiny organisms which were first to colonize onto land
A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point. Assume no air. What was the angle of launch if g = 9.80 m/s2?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°
One piece of evidence supporting the theory of cosmic inflation is
A) the observed fact that the geometry of the universe is "flat.". B) the fact that neutrinos are now known to have no rest mass. C) the fact that neutrinos have been found to have rest mass. D) the observed fact that the temperature of the cosmic background radiation is now about 4 Kelvin. E) the observed fact that the geometry of the universe is "open."
If a source of sound is traveling toward you, the speed of the sound waves reaching you is _______________ the speed the sound waves would have had if the source were stationary
a. faster than b. slower than c. the same as