Which of the following is an example of a chemical change?

melting a stick of butter

dissolving salt in water

using magnesium to displace hydrogen gas from water

I'm which medium would sound travel faster? A) across a room B) in a swimming pool C) through outer space D) through a rail road track

Describe the advantages and disadvantages of bilingualism in childhood. Be sure to support your answer with information you learned in the lesson.

1. The natural laws include the law of ___ A. speed limits. B. gravity. C. railroad crossings. D. yielding. 2. Which of the following should determine whether you need to speed up or slow down? A. how quickly you need to get somewhere B.

A German scientist, George Ohm, discovered the relationship between current, voltage, and resistance. This became known as Ohm's law.

At t = 0 the components of a radio-controlled car's velocity are vx = 0.5 m/s and vy = 1.2 m/s. Find the components of the car's velocity at t = 4.

A wave will travel only as long as it has energy

a box sliding on a frictionless surface when it suddenly begins to rain heavily. if the downpour of rainfall falls vertically into the box, gradually filling it, what would happen to the speed of the box

Which would fall with a greater acceleration in a vacuum-a leaf or a stone?

A force acts on a 5kg object at rest. How fast will the object accelerate on a frictionless surface? A.) 4 m/s^2 B.) 15 m/s^2 C.) 25 m/s^2 D.) 100 m/s^2

Four wrestlers step on a scale for a tournament. Wrestler A weighs in at 170 pounds; wrestler B weighs in at 168 pounds; wrestler C weighs in at 171 pounds; and wrestler D weighs in at 169 pounds.