Kinetic energy is an expression of the fact that a moving object can do work on anything it hits; it quantifies the amount of work the object could do as a result of its motion. And potential energy <span>is the </span>energy<span> that is stored in an object due to its position relative to some zero position. </span><span> We calculate as follows:
KE + PE = mv^2 / 2 + mgh
Total energy = .4(25)^2/2 + .4(9.81)(1.2)
Total energy = 129.71 J = 130 J <------- OPTION A</span>
The Coulomb’s law is expressed mathematically as:
F = k * q1 * q2 / d^2
Where,
F = force of attraction between 2 particles = 2.0 N
<span> k = Coulomb’s
constant = 8.988 * 10^9 N m^2 / C^2</span>
q = charge of the particle
d = distance between the 2 particles = 1.35 m
Since the two coins have identical charges therefore q1 =
q2 =q
F = k* q^2 / d^2
2.0 N = (8.988 * 10^9 N m^2 / C^2) * q^2 / (1.35 m)^2
q =
2.01 * 10^-5 C
<span>Therefore each coins have charges equivalent to 2.01 *
10^-5 C.</span>
convex lenses.
eyeglasses with convex lenses increase refraction, and accordingly reduce the focal lenght
Answer:
The effort distance (also sometimes called the “effort arm”) is shorter than the resistance distance. Mechanical advantage = |Fr/Fe | where | means “absolute value.” Mechanical advantage is always positive.
Since both the speeder and the state trooper are moving at the same
speed and same direction, therefore there would be no or zero Doppler shift.
In order to have a Doppler shift, the distance or separation between the
state trooper and the speeder must also be changing with time. Which in this
case, the distance remains the same or constant since they are moving alike.
This is just like what would occur if they were both standing still or parked.
<span>So this further means that the frequency of sound is the same as the
frequency heard by the speeder. Therefore the Doppler "shift" of the
frequency on the speeder would be
<u>zero. </u></span>
