Answer:
Refractive index = 1.15
Explanation:
As we know for constructive interference of reflected light the path difference of two reflected light rays must be integral multiple of the wavelength
so here we have
now here we know that
now we have
You started out by telling us that the block of paraffin has
10 cm³ of volume. When it's completely submerged, it displaces
10 cm³ of gasoline. Each cm³ of gasoline weighs 0.0069N, so
the whole 10 of them weigh (10 x 0.0069) = 0.069 N.
We notice that the block of paraffin weighs more than the gasoline
that it displaces. So there's no doubt about it ... the paraffin sinks
in gasoline.
If you were to drop it into water instead, it wouldn't sink. Each
cm³ of water weighs 0.0098 N, and 10 of those weigh 0.098N.
In water, the paraffin would settle down only until it displaced
its own weight ... 0.085 N, about 8.7 cm³ of water ... and then
it would float right there, with about 87% of it under water and
the other 13% of it above the surface.
Answer:
2.019 seconds.
Explanation:
Here we use the equation:
Distance covered = (initial speed x time) + 0.5 x (acceleration x time^2)
The vertical distance to cover is 20 meters.
Since the cannonball is fired horizontally, the initial vertical speed is 0 m/s.
Acceleration due to gravity is 9.81 m/s^2.
Substituting these values into the equation we get:
20 = (0 x time) + 0.5 x (9.81 x time^2)
Solving this equation for time gives us 2.019 seconds as the answer.
Answer:
The average force exerted on the window due to two snowballs is 6 N
Explanation:
Given:
Mass of snowballs Kg
Velocity of snowball
For finding the average force,
Force is equal to the change in momentum,
Here, final velocity is zero so we write,
Where sec
N
Above value of force is due to one ball, but here given in question there are two ball,
N
Therefore, the average force exerted on the window due to two snowballs is 6 N
The heat transferred is -30J
When the gas undergoes compression, work is done on the gas and its internal energy increases.
According to the first law of thermodynamics, the increase in internal energyΔU is the sum of the heat given to the gas ΔQ and the amount of work done on the gas ΔW
The work done on the gas is 150 J due to compression and the internal energy of the gas increases by 120 J.
Therefore, the heat given to the gas is given by,
Thus, an amount of heat equal to 30 J flows out of the system.