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?

A. 3.13 g

B. 6.25 g

C. 12.5 g

D. 25 g

Hey, what is antimatter

What is the insertion for the brachialis

What is an incomplete metamorfisis

The study of the Earth's magnetic field is known as A. isochronism B. paleomagnetism C. magnetism D. topography

Renald completed only one trial of his experiment. what effect will this most likely have? a. the results are more likely to have errors. b. the results are more likely to be precise. c. the experiment will be harder to replicate. d.

Temperature is usually measured in degrees with a (n)

Two lab carts are pushed together with a spring mechanism compressed between them. Upon release, the 5.0 kg cart repels one way with a velocity of 0.12 m/s. The 2.0 kg cart goes the other way. At what velocity does it travel?

A bowling ball has a mass of 7.2 kg and a weight of 70.6 N. It moves down the bowling alley at 1 m/s and strikes a pin with a force of 15.0 N. What is the force that the pin exerts on the bowling ball?

an electric clothes dryer has a resictance of 16 Ohms it drawes 15 A of current what is the voltage in volts of the wall outlet that it is pluged into

A lorry with a mass of 5000kg accelerates to overtake a caravan on the motorway. Its acceleration is 1.5m/s². What force must the engine be providing? You can ignore the effects of friction and air resistance