Wind farms, solar collectors, and nuclear power plants generate no pollution.
But wind farms make noise, wind and solar are both hazardous to birds, and there's no known means of disposing of nuclear plant waste that's completely safe.
Answer:
12.4m
Explanation:
Given
Length of string = 6.2m
L = λ/2 (for natural frequency (first harmonic)
λ = 2L
λ = 2(6.2)
λ = 12.4m
Hence the wavelength of the produced standing wave is 12.4m
Answer:
Assuming that air resistance is negligible.
a. Approximately
.
b. Approximately
.
Explanation:
Let
denote the mass of this diver.
If the initial speed of the diver is
, the initial kinetic energy (
) of this diver would be
.
If the height of this diver is
, the gravitational potential energy (
) of this diver would be
.
The initial mechanical energy of this diver (sum of
and
) would thus be:
.
If air resistance on the diver is negligible, the mechanical energy of this diver would stay the same until right before the diver impacts the water. The entirety of the initial mechanical energy,
, would be converted to kinetic energy by the time of impact.
Rearrange the equation
to find an expression for the speed of the diver:
.
Thus, if the kinetic energy of the diver is
, the speed of the diver would be:
.
Notice how
, the mass of the diver was eliminated from the expression.
If the diver started with no initial speed (
) at a height of
, the speed of the diver right before impact with water would:
.
If the diver started with an initial velocity of
upwards (initial speed
) from a height of
, the speed of the diver right before impact with water would be:
.
Answer:
- <u>Translated from Spanish language:</u>
"As part of a vertical shooting test a rock is thrown, with an ancient Roman catapult, vertically upwards with an initial speed of 100m / s."
Explanation:
- As, the motion can be termed as more of a projectile form, while the initial velocity of the projectile or the body in motion is about a 100m/ s. We can easily determine the final velocity, Vf of the body by the following equation given as follows.
- And, let say that the initial time taken is about 2 seconds.So, we can put the values of the gravity, along with the time,t in the following equation and get a valid result for all of this in a more proper way.
- Vy= V(x)- gt, ⇒ V(y)= 100- (9.8)×(2 seconds),
- V(y)= 80.4 m/sec. <u>"</u><u>Answer"</u>