What can you observe to know that when clear methane gas is burned it is a chemical change?

1) Change of color

2) Formation of a precipitate

3) Change in mass

4) Formation of a gas

5) Change in temperature

6) Change in shape

A boat is headed with a velocity of 18 meters/second toward the west with respect to the water in a river. if the river is flowing with a velocity of 2.5 meters/second in the same direction as the boat.

When a rifle fires, a sequence of events takes place. After the firing pin strikes the primer, what is the next event in the sequence? Expanding gas drives the bullet through the barrel. Gunpowder burns and converts to a gas. The trigger is pulled.

If you have one pencil and that pencil shoots lasers out of its mouth then an dog comes and tells you the future and that you shouldn't vote for Bush again and then the dog ate the pencil and exploded and the alien comes and takes you away to his

A piece of electronic equipment that is surrounded by packing material is dropped so that it hits the ground with a speed of 6.5 m/s.

Where does competition for reproduction most likely to occur

A wire carries a steady current of 2.20 A. A straight section of the wire is 0.750 m long and lies along the y axis within a uniform magnetic field, vector B = 1.70 k T.

A 5.00-kg howler monkey is swinging due east on a vine. It overtakes and grabs onto a 6.00-kg monkey also moving east on a second vine. The first monkey is moving at 10.0 m/s at the instant it grabs the second, which is moving at 7.00 m/s.

One of the heating systems we talked about in this course comprises of a system of ducts. What is the process by which heat is transferred in this system? a. Conduction b. Convection c. Radiation d. None of the above

If the north pole of a magnet in a compass is attracted to Earth's geographic north, what must be the polarity of Earth's magnetic north pole? A. north B. south C. It can't be determined from the information given.

A canoe started its trip at 8 am. If the cannoe travelled at a speed of 70 mph how far did it travel by 1:36 pm?