How many electrons in a hydrogen atom?

Which contributions did Johannes Kepler make? Check all that apply. He revived Aristotle's model of the solar system. He solved Ptolemy's model by proving elliptical orbits. He proved Galileo's calculations were incorrect.

A sled of mass m is given a kick on a frozen pond. The kick imparts to the sled an initial speed of v. The coefficient of kinetic friction between sled and ice is μk. Use energy considerations to find the distance the sled moves before it stops.

in a game of hockey the hockey puck took 0.8 seconds to travel 89 feet to the goal line. determine the average speed of the puck per second

What is the distance a bullet will travel when launched at 166 meters per second for 5.75seconds?

What injuries could occur due to incorrect movement and handling of equipment with any sport or activity? (Select ALL that apply) Strains/sprains Dehydration Tears to muscles, ligaments, tendons Hypothermia

A hollow pipe is submerged in a stream of water so that the length of the pipe is parallel to the velocity of the water.

If the speed of an object decreases to one-half, what happens to its momentum? It doubles It remains the same It decreases to one half It decreases to one fourth

If a reaction has a rate constant of 3.7 x 10-3 s-1 at 25oC, and an activation energy of 43.6 kJ/mol, what will be the rate constant for this reaction at 75oC?

Two sounds are played for you. The first has a frequency of 196 Hz. The second has a frequency of 392 Hz. Which sound will be "higher" to your ear? A) The First B) The Second C) They will sound the same

When is an object that has been dropped from a great height through the air closest to vein in a free fall? At it's terminal velocity < - - this one?