Complete the sentence. Light travels in___at a speed of___
Select one:

-vacuum: 3.00 x 108 m/s

-all materials: 3.00 x 108 m/s

-vacuum: 3.00 x 1012 m/s

-all materials: 3.00 x 1012 m/s

Apossible explanation for a set of facts that can be tested by further investigation is called

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?