Who developed the atomic theory of matter? john dalton niels bohr marie curie ernest rutherford?

Due to continental drift, the North American and European continents are drifting apart at an average speed of about 3 cm per year. At this speed, how long (in years) will it take for them to drift apart by another 1300 m?

What is the object called that does not allow electricity to pass through it?

Why is the gravitational potential energy of an object 1 meter above Earth's surface more than its potential energy 1 meter above the moon's surface? A. The object's mass is less on the Earth. B. The object's weight is more on the moon. C.

The speed of sound in air depends on temperature. a. True b. False

An aluminum wire having a cross-sectional area equal to 3.90 10-6 m2 carries a current of 6.00 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom.

When viewing a piece of art that is behind glass, one often is affected by the light that is reflected off the front of the glass (called glare), which can make it difficult to see the art clearly.

force used to lift a 25kg mass to a height of 24m in 5 sec does 2120J of work. Calculate the power.

Which statement is true about the atom? A: it contains positive electrons, uncharged protons and negative protons. B: it contains uncharged neutrons, positive electrons and negative protons.

Steel objects can become temporary magnets because they are mainly composed of which element?

How long does it takes the sun to rotate the earth?