Answer:
Explanation:
Refractive Index: It is a measure to find how fast the light travels through a medium. It is ration of the speed of light in vacuum to speed of light in the medium. Speed of light is not constant and varies depending on the density of the medium.
In vacuum the speed of light is 300000 km/s and is denoted by c. When the light beam enters any medium the speed will decrease. Here it is given that the speed in plastic is v. Thus the refractive index(n) is given as:
It is a dimensionless no.
Answer:
104 horsepower
Explanation:
Given:
Voltage across the terminals of the battery (V) = 480 V
Charge flowing through the battery pack (Q) = 1527 C
Time interval for charge flow (Δt) = 9.5 s
Now, current flowing through the battery pack is given as:
Now, power of the car's engine is calculated using the formula:
Plug in the given values and solve for 'P'. This gives,
Now, 1 horsepower (hp) = 745.7 W
Therefore, 1 W =
So,
Hence, the horsepower of the car's engine is approximately 104 horsepower
Answer: Primary coil
A Step-down transformer is an electrical device which is used to decrease the voltage using magnetic induction. The windings of the primary coil are more than the windings of the secondary coils. h1, h2 notations are used to refer to primary coils. On the other hand, x1, x2 notations are used to refer to the secondary coils of the transformer. In case of step-up transformer, the windings of primary coil are less than the secondary in order to increase the voltage.
When one form of energy is transformed to another, no energy is destroyed in the process. So, the total amount of energy is the same before and after any transformation.
Answer:
Option (A)
Explanation:
Dacite is an igneous rock that is light in color and is usually fine-grained in nature. These rocks contain porphyritic texture where the larger grains are surrounded by the smaller grains. They are mostly found to be present in the lava flows and domes, sills, and in case of some pyroclastic materials. These are commonly found on the continental crust just above the subduction zones.
They are also found as extrusive rocks when magma exerts the force upward and comes out to the earth's surface through the fractures, forming lava. And due to the fast rate of cooling, these Dacite rocks are coarse-grained in nature. They are mostly associated with volcanic activities.
Thus, the correct answer is option (A).