How can you calculate the number of electrons in an atom

When cleaning up a local beach, students found many different particles that were in the water that affected the shoreline, like litter and gasoline. Which of the following describe how these items would need to separated from the water? Why? A.

The speed of sound in fresh water at 293k is 1482 m/s. At what temperature is the speed of sound in helium gas the same as that of fresh water at 293k? Helium is considered a monatomic ideal gas (y = 1.67 and atomic mass = 4.003u).

What is the speed of a proton after being accelerated from rest through a 5.6x107 V potential difference?

An object moves in uniform motion at 25 m/s and takes 1.0 seconds to go a quatar circle. What is the radius of the circle

In order for an object to accelerate, a forcegravityfrictiona swing must be applied.

A high-mass star has more "fuel" than a low-mass star. which lives longer? why?

Suppose that, while lying on a beach near the equator of a far-off planet watching the sun set over a calm ocean, you start a stopwatch just as the top of the sun disappears. you then stand, elevating your eyes by a height h = 1.

Suppose you want to know if the color of peoples hair affects how warm it can keep their heads. describe the skills you would use to conduct an experiment to test your inquiry

The mass is increased by a factor of four. What is true about the period? Choose the best answer. The period remains unchanged. The period increases by a factor of four. The period is halved. The period doubles.

What does law of conservation of mass mean?