What is the speed of the pulley A if pully D is moving at a speed of 8 km/h​

The speed of light can be used to measure the

If forces acting on an object are unbalanced. true or false

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3