a circle rolling in a circle ...

The radius of the inner circle is half of the outer fixed circle.

Prove that a point on the circumference of the inner circle will move on a starght line and perform SHM.

Using the superposition principle , find the voltage across 1Kohm in the fig .Assume the source to be ideal 

Find the displacement vector AB and its magnitude if the body 

displaces from the point A (1,2, -1) and to the point B (3,2,2).

Leeuwenhoek first described one of the following 

Write down the three distinct way by which gamma radiations interact with matter.

Question: look at the spectrum of the unknown element 1. right below the color and Corresponding wavelength of the brightest lines. You can determine the wavelength of the lines by first measuring the length of the scale bar in centimeters, calculating the scale factor, then measuring the position up the line of your interest from the left edge cm. The left edge is at 4100 Angstrom. multiply your position in CM by the scale factor and then add 4100 and Ångströms to get your wavelength.

The size or diameter of a molecule is 

a)1mm b) 10mm c)10-10m d)10-10 mm

https://www.chegg.com/homework-help/questions-and-answers/diffraction-light-various-periodic-structures-discuss-diffraction-optical-plane-wave-wavel-q14127341

A rectangular pontoon has a width of 6m, a length of 12m, and a draught of 1.5 m in fresh water(1000kg/m3). What will be its draught in sea water(1025kg/m3).