Francium decays with a half-life of 22 minutes. If we start out with 639 mg of francium, how much would remain after 2.7 hours?

*Show all of your work

What is the cooling power P? Recall that the rate at which energy is removed, also called the cooling power, was described earlier as being constant. Express your answer numerically in watts (joules per second).

How did the temperature structure of the solar nebula determine planetary composition?

6) Mechanical (sound) waves are unable to travel through a vocuurn, such os through space, but r from satelites How is this possible?

A balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm3.

Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is a. 30. b. 34. c. 64. d. 94. e. 32.

Which of the following is not a current use of radioisotopes? medical diagnosis sterilization of equipment detection of leaks in building structures light fixtures

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a

What is Nothing. (sorry i have been wondering this for a very long time)

What is the weight of a 15kg dog on earth?