Stars go through a life cycle. About 90% of all stars are in the main sequence period of the life cycle. Stars are stable during the main sequence period of the life cycle. Why?

A car travels up a hill at a constant speed of 22 km/h and returns down the hill at a constant speed of 55 km/h. calculate the average speed for the round trip.

If the solid form of most molecules is heavier than the liquid form, why does ice float

A car with a constant velocity of 22 m/s is driven for 6.8 s. How far did it travel? (v = ∆ d/∆t) A. 29 m B. 154 m C. 150 m D. 3 m

440nm, 690nm, 490nm, 580nm which one would most likely be seen in red (wave length)

Electric charges of the opposite sign exert no force on each other. attract each other. repel each other. repel and attract each other. repel and attract each other depending on the magnitude of the charges.

A plane is flying east at 135 m/s. The wind accelerates it at 2.18 m/s^2 directly northeast. After 18.0s, what is the magnitude of the displacement of the plane?

The same constant force, F, is applied to two blocks. The first block has a mass of M and the second block has a mass of 2M. Both blocks are initially at rest and the force acts on each of them for the same period of time, t.

Which of the following is an example of the strong nuclear force acting in an atom? A. A proton repelling a proton B. A neutron attracting a neutron C. A neutron repelling an electron D. An electron attracting a proton

Does the air in our atmosphere have mass?

Your instructor hands you a closed flask partly filled with room-temperature water. When you hold it, the heat transfer between your bare hands and the flask causes the water to boil. Quite impressive! How is this accomplished?