The total number of protons plus neutrons in an atom of ⁴⁵₂₀Ca is

A.) 20

B.) 25

C.) 45

D.) 65

A 0.50kg object is at rest. A 3.00N force to the right acts on the objest during the time interval of 1.50s

A long metallic wire is stretched along the x direction. The applied potential difference along the wire is 12 volts. The resistance of the wire is estimated to be 8 Ohm. a. Calculate the current in the wire and the passing charge in 2 seconds. b.

Resonance in air column is used in which of these musical instruments Trumpet Drums guitar violent Trumpet makes the most sense

How do musical instruments vary pitch

Sound waves cannot travel in a. steel. b. air. c. a vacuum. d. water. e. sound can travel in all of the above.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.

Why does each mineral have their own property, different from every other mineral?

Earth's tallest mountain ranges are found at plate boundaries