8 Grade Science

Explain how a Lava lamp demonstrates convection currents.

What determines the speed of a wave?

We know a chemical reaction has occurred when

An engine flywheel initially rotates counterclockwise at 6.69 rotations/s. Then, during 20.1 s, its rotation rate changes to 2.65 rotations/s clockwise.

A 300-n force acts on a 25-kg the acceleration of the object is what

A train rolls to a stop along a horizontal track without the conductor applying the brakes. what answer choice best explains why this occured

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?