An atom has an atomic number of 12 and a mass number of 0.25. How many neutrons does the atom have?

Describe examples of radiation, conduction, and convection from your daily life

A 2,500 kg car traveling to the north is slowed down uniformly from 20.0 m/s by a 6,250 N braking force acting opposite the car's motion. a) What is the cars velocity after 2.50 s? b) How far does the car move during 2.

Why were IC engines invented and by who?

A submarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. What is the approximate pressure (water plus atmospheric) at this depth? (Recall that the density of seawater is 1025 kg/m3 g = 9.

A student wants you to demonstrate that an electric current will produce a magnetic field. Which set of objects could be used to demostrate this? A) A battery, a coil of wire and a compass. Eliminate B) A compass, some paper clips and a battery.

A graph titled Position versus time for with horizontal axis time (seconds) and vertical axis position (meters). A straight blue line runs with an upward slope from 0 seconds 3 meters to 4 seconds 15 meters. The starting position of this object is m.

There is a 50 g sample of Ra-229. It has a half-life of 4 minutes. How much will be left after 12 minutes?

Fill in the missing words to make the statements about electromagnetic induction true. If the north pole of a magnet is inserted into a solenoid, a will be induced in the solenoid.

an 85 kg construction worker has 37,485 j of gravitational potential energy to the nearest whole number the worker is blank m above the ground. answer the blank = )

What are the similarities and differences between speed and velocity?