Some people think that coloured filters add colour to white light. Why is this not correct

What is the type of the reaction below? BaCl2 + H2SO4 → 2 HCI + BaSO4 Double replacement Synthesis Single replacement Decomposition

A person is standing outdoors in the shade where the temperature is 17 °C. (a) What is the radiant energy absorbed per second by his head when it is covered with hair?

Two objects, labeled A and B, are the same size. Object A has a density of 1.21 g/cm3. Object B has a density of 1.37 g/cm3. Both are placed in a beaker of water. Which will float higher in the water?

Resistance training is sometimes called what training

A wave will go faster through a liquid at blank temperatures.

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1) gravity 2) normal force 3) air resistance 4) tension 5) friction

Use Newton's universal law of gravitation to explain why gravity is greater on Earth than on Mercury.

What is a magnetic field and how does it interact with magnetic materials?