The electrons and the protons of hydrogen atom are separated, on average, by a distance of about 5.3x10-11 meters. find the magnitudes of the electric force and the gravitational force that each particle exerts on the other.
mass of electrons= 9.109x10-31
mass of protons= 1.673x10-27
charge of electrons= -1.60x10-19C
charge of protons= 1.60x10-19C

Aquantity of gas has a volume of 1.5 m3 and an absolute pressure of 95 kpa. when the gas is compressed to a volume of 0.5 m3, what is the new absolute pressure of the gas? (assume that there’s no change in temperature.)

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?