To mop-clean a floor, a cleaning machine presses a circular mop of radius R vertically down with a force F and rotates it with a constant angular speed about its axis. If the force F is distributed uniformly over the mop and if the coefficient of friction between the mop and the floor is μ, the torque, applied by the machine on the mop is: A. 2μFR3B. μFR3C. μFR2D. μFR6

What type of questions asked from the lesson of magnetic effect of electric current 

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?