A test taker makes an estimate for a 30-second time interval. The estimate is 34.5 seconds. What is the percent error in this example?

Alpha and beta particles and gamma rays are examples of

Calculate the electrical energy expended in a device across which the circuit voltage drops by 40.0 volts in moving a charge of 2 coulombs. A) 20 B) 80

Which of the follwoing best summarizes the wave mechanical model of atoms?

Which of the following is true about the law of conservation of energy? Energy can be destroyed Energy can be created Energy can be converted from one form to another All of the above are correct

If you want to double the kinetic energy of a gas molecule, by what factor must you increase its momentum? A) 16 B) √2 C) 2 D) 2√2 E) 4

A soccer ball is sitting in the middle of a soccer field during a game. When the referee blows his whistle, one of the players runs toward the ball and kicks it as hard as he can.

A body with v=20m/s changes its speed to 28m/s in 2sec. its acceleration will be

Charge: A piece of plastic has a net charge of + 2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 * 10-19 C)

How much heat is needed to raise the temperature of 6g of water by 18oC?

A proposed space station includes living quarters in a circular ring 50.0 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth?