Assuming the stone starts from rest and air resistance is negligible, the depth of the mine shaft can be found by solving the equation x = 1/2 at^2, where "x" is distance, "a" is acceleration due to gravity, and "t" is time. The answer is 176.4 meters or 588 feet.
Continue ReadingThe value of a is 9.8 meters per second squared. The value of t is 6 seconds. Therefore, 0.5 x 9.8 x 36 equals 176.4 meters. In practice, air resistance extends the time it takes the stone to hit the bottom of the mine shaft by a fraction of a second. As such, the actual depth of the mine shaft would be a few meters less than the result obtained from the equation.
Learn more about PhysicsParachutes work by increasing air resistance, which slows down the effects of gravity. Air is a gas, and though it is invisible, the molecules in the gas can still be used to help slow down a skydiver, much like water slows down a person who does a belly flop in water. Therefore, the air expands the parachute, providing resistance as the person falls.
Full Answer >No machine can operate at 100 percent efficiency because some of the energy input will always be used to overcome the force of gravity and the effects of friction and air resistance. Even an optimally tuned engine heats up eventually, and that heat is thermal energy being lost.
Full Answer >A wave’s amplitude is the distance measured from the rest position to the crest’s top or the trough’s bottom. On a wave diagram, the rest position is the central line. The wave’s crest is at its highest point while the trough is the lowest point.
Full Answer >Rotary encoders digitize a signal determined by the intermittent passing of light from a light-emitting diode through a spinning disc attached to a motorized shaft. Thus, encoding information about the rotational motion of the shaft.
Full Answer >