A sample of fluorine-18 in a laboratory has an initial mass of 50mg. flourine-18 has a half life of 1.8 hours Calculate the amount of time it will take for the initial mass of fluorine-18 to be reduced from 59 mg to 12.5mg

High tide are experienced 12 hours apart for a certain coastline. Which of the following best explains the reason for this phenomenon? The coastline experiences tidal bulge twice a day. The coastline experiences tidal bulge once a day.

Is a measure of how closely packed together the particles of matter are in a specific volume

A car traveled 112.0m in 24.500s, what was the car's average speed?

What is 9+10? (is this a trick question, or not?)

Fluid is leaking from an axle seal. Technician A says to remove the wheel and check for incorrectly installed brake components. Technician B says to check for obstructions at the differential breather.

In the hydrologic cycle, water evaporates into the atmosphere. It then condenses and falls to the ground as precipitation. How can the water return to the atmosphere?

List 6 Physical properties List 6 Chemical properties

Anytime a scientific theory is challenged does it mean that its not a good theory

A toroidal inductor has a circular cross-section of radius a a. The toroid has N turns and radius R. The toroid is narrow (a≪R), so the magnetic field inside the toroid can be considered to be uniform in magnitude.

A quarterback throws a football with an initial velocity v at an angle θ above horizontal. Assume the ball leaves the quarterback's hand at ground level and moves without air resistance.