Radioactive decay of 40k atoms in an igneous rock has resulted in a radio of 25 percent 40k atoms to 75 percent 40Ar and 40Ca atoms. How many years old is this rock

A 3.7 kg object is lifted to a Hight of 3 meters what is the potential energy of this object

The density of mercury is 13.6 g/cm3 calculate the mass of 1 cm3 of mercury

Your car burns gasoline with air to make heat where does most of this energy come from

On the surface of the earth, a kilogram weighs approximately: 1 pound 2 pounds 5 pounds 10 pounds

Which example provides the most complete description of an object's motion? 1. The ballerina rotated 10 times in 2 minutes. 2. Bobby threw a Frisbee 10 m through the hoop. 3. The turtle took 20 minutes to make it to the other side of the road. 4.

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially.

You short-circuit a 9 volt battery by connecting a short wire from one end of the battery to the other end. if the current in the short circuit is measured to be 18 amperes, what is the internal resistance of the battery?

A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as well. Which of the following formulas can be used to calculate the volume of the ball?

Is there such a thing as real time weather radar? why not?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.