Work and Energy

Suppose a car approaches a hill and has an initial speed of 120 km/h at the bottom of the hill. The driver takes her foot off of the gas pedal and allows the car to coast up the hill.a) if the car... more


What are the forces that are holding up the plank?

Two painters are standing on a plank while painting a building. The plank is uniform, weighs 72.0 lb, and is 16.0 ft long. The plank is being held up by two forces that are 1.25 ft in from each... more


Question on probability/sets

You have a basket containing 7 red balls, 5 green balls, and 2 orange balls. You pick 5 balls at random. What is the probability of getting at least one red ball?

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