If somebody asks me if i need help on my work and i say " no ty " , is that rude???

An astronomer at the equator measures the doppler shift of sunlight at sunset. from this, she calculates that earth’s tangential velocity at the equator is 465 m/s. the centripetal acceleration at the equator is 3.41  10 2 m/s 2 . use this data to calculate earth’s radius.

The metric unit of electrical power is the watt volt ampere ohm

What are similarities and differences of reflection, refraction, diffraction and absorption?