<span>In real machines, efficiency is always less than 1 .</span>
Answer: 1.43
Explanation:
Given that:
C (critical angle) = 44.4°
n (refractive index of plastic) = ?
Apply the formula n = 1/sineC, the index of refraction for the plastic can be obtained by:
n = 1/sineC
n = 1/sine 44.4°
n = (1/0.6996)
n = 1.43
Thus, the index of refraction for the plastic is 1.43
Answer:
They are correct
Explanation:
According to the uncertainty principle, the uncertainty in the position of an object is directly proportional to its De Broglie wavelength.
The De Broglie wavelength of a baseball is about 
, recall that the diameter of the atom is about to 
. Thus, the error in simultaneously determining the position and momentum of a baseball is infinitesimally small.
When gasoline burns in a car engine, some of the chemical energy in the gasoline is converted into heat. The heat is converted into mechanical energy. The mechanical energy moves the car or vehicle.
Actually, the speed of the earth is the same everywhere, taking the angular speed as the valid measure of the speed
