Which of the following materials could have been found in the giant cloud that formed the solar system?
1.hydrogen and helium
2.hydrogen and oxygen
3.carbon dioxide and oxygen
4.liquid and solid water

Which best represents the law of conservation of mass ?

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?