One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

A 26-g steel-jacketed bullet is fired with a velocity of 630 m/s toward a steel plate and ricochets along path CD with a velocity 500 m/s.

A certain copper wire has a resistance of 10.5 ω. at what fraction of the length l must the wire be cut so that the resistance of one piece is 9.0 times the resistance of the other?

Advantages and disadvantages of resonance

You toss a coin straight upward in a train which is moving at a constant velocity. If the air friction is negligible, the coin will land (a) In front of you (b) behind you (c) on your hand (d) at either in front of you or behind you

Why wheat flour is usually passed near magnet near a magnet before being packed

As protostars continue to contract, their cores become hotter and more dense until what process begins ...

Emily jogs 3 laps at the track to warm up. She jogs at 5 mph. Then she runs 3 more laps at 7 mph. What is true about her average speed and her average velocity?

Which of the following elements are the most reactive? beryllium, calcium, magnesium, barium?

1.) State which definition of power below is correct. A.) the energy transferred per hour. B.) the energy transferred. C.) the energy transferred per second. D.) the force over a distance. 2.

Science and technology are closely related, but not the same. Which of the following is most likely a result of technology, not science?