Question
The average of a number and its reciprocal is 1. What is
the average of its square, cube and fourth power?Solution
Let the number be x So, its reciprocal = 1/x Average = 1 So, total = 1 × 2 = 2 So, x + 1/x = 2 So, x = 1 Now we know any power of 1 is always 1 So, average = (1 + 1 + 1)/3 = 1 ∴ Average is 1
In an experimental arrangement of a Fresnel's biprism, monochromatic light of wavelength 2. is used to produce interference fringe pattern. On introduc...
Which of the following is an alpha particle which is emitted in radioactivity?
A copper block of mass 3 kg is heated in a furnace to a temperature of 450°C and then placed on a large ice block. Find the maximum amount of ice that...
Which graph represents uniform motion?
What type of lens is used to correct myopia (shortsightedness)? Â
The part of the eye having the largest refractive index is -
The ratio of the total distance traveled by a body to the total time taken is its:
The time period of a simple pendulum depends on — Â
When a passenger in a moving bus is suddenly thrown forward when the bus stops, this is explained by:
What device is used to measure electric current? Â
Relevant for Exams:
