Answer:
2.17 x 10^8 m/s
Explanation:
Angle of incidence, i = 30 degree, refractive index of mineral oil, n = 1.38
Let r be the angle of refraction.
By use of Snell's law
n = Sin i / Sin r
Sin r = Sin i / n
Sin r = Sin 30 / 1.38
Sin r = 0.3623
r = 21.25 degree
Let the speed of light in oil be v.
By the definition of refractive index
n = c / v
Where c be the speed of light
v = c / n
v = ( 3 x 10^8) / 1.38
v = 2.17 x 10^8 m/s
Answer:
<em>t = 1.875 hours</em>
Explanation:
<u>Speed</u>
The speed is the rate at which an object moves. If the speed is constant, then the formula to calculate it is:
Where d is the distance traveled in time t.
The jogger runs 6 Km plus 5 Km plus 4 Km north for a total of 15 Km.
It's given her average speed is 8 Km/h. We can calculate the time take to complete the run by solving the above formula for t:
t = 1.875 hours
Answer:
a) the gravitational force will be so big that the object would never be able to leave
b) the gravitational pull will have a similar effect
Explanation:
a)
Newtons approach for the gravitational pull is:
let m1 be the mass of the black hole, and m2 the mass of the poor object which is brave enough to get close to it. r is the distance from the black hole to the object.
The mass of a black hole is tremendously big and compact, even our sun is light weight compared to a random black hole. The gravitational force decreases with the square of the distance, however, m1 can sometimes be so big that even an object that is far away would be attracted. The object will get attracted untill r is 0 and the gravitational force is equal to infinite ( no return in this case)
b)
Now a collapsing star with 3 solar masses and a radius of 2.5 times the radius of our sun will do the same, as the radius of the star decreases the gravitational pull increases with the square of the distance, until the singularity (r=0) which means that the gravitational force is infinite
Answer: solute: sugar, coffee powder, salt, cocoa powder, liquid detergent, monosodium glutamate (vetsin).
solvent: cow's milk, water, fruit extract
Explanation:
A solution is a mixture that is made up of two or more substances including solute and solvent.
The solute is one which can be dissolved in a liquid part that is solvent. The solute can be liquid or solid. Solutes are sugar, salt, coffee powder, cocoa powder, liquid detergent, monosodium glutamate.
The solvent is one which dissolves in it solute particles or molecules. Solvent are cow's milk, water, and fruit extract.
Answer:
W = 210 N
Explanation:
For an ideal machine:
where,
P = Effort = Spring Scale Reading = 70 N
L = Effort Arm = Length of inclined plane = 12 m
W = Actual Load (Weight) to be lifted = ?
H = Load Arm = Height = 4 m
Therefore,
<u>W = 210 N</u>