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1. Can pressure stop a reaction?

So i am mixing Magnesium and water (the MRE heaters) in about a .3 mL container with a ball valve. It's reacting but not as well as usual, like in an unpressurized container such as a 2 liter coke bottle. It's just not producing enough Hydrogen (yes my calculations and ratios are correct) to get...
2. What happen's if one cell organelle quits working

what happen's if one cell organelle quits working how does it affect the cell?
3. Pulley physics help

Homework Statement ok so box 1 (5kg) is ontop of box 2 (10kg) and this guy has to pull the box with an unknown force, but the boxes are on a pulley conected to a wall (not a celling). The coefficient of static friction between the box and the floor is .9. The coefficient of kinetic friction...
4. Kinematics questions

Homework Statement A ball is thrown off the top of a 50 m cliff at an angle of 30 degrees with a velocity of 22 m/s. How long is the ball in the air in s? How far from the base of the cliff does the ball land in m? What is the maximum height reached by the ball in m? Homework...
5. Knematics finding velocity

Homework Statement A person throws a rock horizontally from the roof of a 50m building. The rock lands 70 m from the base of the building. How long was the rock in the air in s? I got 3.194. The online home work thingy (webassign) said I was right. With what velocity was the rock...
6. Can i please get a little help on this problem i dont think i did it right.

So, how much weaker is the force of gravity at 500 kilometers above Earth's surface? Calculate how much of a g force the astronauts are actually experiencing. This equation can be modified for any other planet by replacing using the planet's radius and its surface gravity (how many g's). this...
7. Why do plains, shuttles, & man made things that fly have 3 wings?

why do plains, shuttles, & man made things that fly have 3 wings? My parents told me it was so the craft doesnt go into a constant spin. But like i wanta know more like in layman's turms and in picktures and stuff. Can any one help me please?
8. Life support?

What exactly is life support? Is it somthing on the shuttle or in their suites? Is it just somthing to recreat the environment of Earth? Please can some one elaborate?