Democritus proposed that atoms are held together by chemical bonds, but no one believed him.

True or False

Which statement is true about two isotopes of the same element? They have the same mass number. They have different numbers of protons. They have different locations on the periodic table. They have different numbers of neutrons.

The force on an object is given by the equation F = ma. In this equation, F is the force, m is the mass, and a is the acceleration. Which answer shows this equation solved for mass? A. m = Fa B. m = m/F C. m = a/F D. m = F/a

9. The sun radiates about 3.6 x 1026 joules of energy each second. How much mass does the lose each second? Show all of your work and be sure all numbers must be clearing identified and explain in your work.

The period of a cepheid variable star and the time of one recent maximum can be used to predict the time of a future maximum. suppose that you calculate the time of future maximum brightness and then make measurements to observe this maximum.

A ball rolls down an incline with an acceleration of 10 cm/s^2. If it starts with an initial velocity of 0 cm/s and has a velocy of 50 cm/s when it reaches the bottom of the ramp, how long is the ramp?

2 A scientific theory is

1.) Which choice is an example of a consumer? A.) sun B.) fungi C.) bee D.) tree

If the line on a distance-versus-time graph and the line on a speed-versus-time graph are both straight lines going through the origin, can the two graphs be displaying the motion of the same object? Explain.

A fragment of a collapsing gas cloud that comes to equilibrium with a central temperature of 4 million k will become a:

Which of the following is a true statement with regard to climate change? a. Climate change takes place at a constant rate over time. b. Climate change takes place at an increasing rate over time. c.