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

What is the heat transfer mechanism responsible for the daily wind cycle

When a star goes from the main sequence to the red giant phase, it becomes larger rather than smaller. This is true because gravity is getting temporarily overpowered by A) Antigravity B) Electron Degeneracy C) Energy of Fusion D) Energy of Fission

Is a sonic boom heard by the passengers traveling in a supersonic aircraft? Why or why not? a.) they do not experience any shift in frequency because they are traveling at the same speed as that of the sound source. b.

Which of the following represents the equation of motion of a steel ball thrown into a viscous liquid when it is moving with an acceleration a? (A) W-V-U=ma (B) W-U=ma-V (C) W-U-V=0 (D) U-V=W

In a motor, the combined effect of electric currents and magnetic forces turn electrical energy into which of the following? A. a battery B. a generator C. mechanical energy D. electromagnetic energy

How many basic wave forms are there? A.) 1 B.) 2 C.) 3 D.) 4

How much power is reqired to lift a 10-n box 2 meters

Dolphins and other sea creatures can leap to great heights by swimming straight up and exiting the water at a high speed. A 200 kg dolphin leaps straight up to a height of 7.8 m.

An example of renewable energy resource is ... A - uranium B - Wind C - natural gas

The power of a 1.5-volt alkaline cell varies with the number of hours of operation. A brand new D-cell can deliver as much as 13 A through a copper wire connected between terminals. Determine the power of a brand new D-cell.