Hard surfaces reflect sound back into the room, while carpets help to absorb the sound so it reflects less
Answer:
The time of the impact , T = 0.2 sec.
Initial velocity of Rocky's punch during that time, u = 90
Explanation:
Given, rocky punches with a force, F = 225 N.
And impulse created, P = 45 Ns.
Impulse, P = force × time of impact = F × T.
so, Time of impact, T = =
T = = 0.2 s.
Impulse is also change in momentum,
P = m(v - u). where, m = mass of the hand.
v = final velocity.
u = initial velocity.
Given that Rocky's hand comes to stop when he strikes the gut,
so, v = 0.
⇒ m × u = 45 Ns.
⇒ u = =
u = 90
I can't think of any way that pressure can be decreased due to added pressure.
Be that as it may, and it certainly still is ...
No matter what you do to the pressure or the temperature of
the gas in that tank, the volume doesn't change. Any sample
of gas always expands to fill the container in which it's confined.
Its volume doesn't change until you either transfer it to another
container with different volume, or else change the volume of
the container it's in.
Answer: 116.926 km/h
Explanation:
To solve this we need to analise the relation between the car and the Raindrops. The cars moves on the horizontal plane with a constant velocity.
Car's Velocity (Vc) = 38 km/h
The rain is falling perpedincular to the horizontal on the Y-axis. We dont know the velocity.
However, the rain's traces on the side windows makes an angle of 72.0° degrees. ∅ = 72°
There is a relation between this angle and the two velocities. If the car was on rest, we will see that the angle is equal to 90° because the rain is falling perpendicular. In the other end, a static object next to a moving car shows a horizontal trace, so we can use a trigonometric relation on this case.
The following equation can be use to relate the angle and the two vectors.
Tangent (∅) = Opposite (o) / adjacent (a)
Where the Opposite will be the Rain's Vector that define its velocity and the adjacent will be the Car's Velocity Vector.
Tan(72°) = Rain's Velocity / Car's Velocity
We can searching for the Rain's Velocity
Tan(72°) * Vc = Rain's Velocity
Rain's Velocity = 116.926 km/h