Recent content by alessandro

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    Calculating Minimum Velocity for Knocking Down a Burning Building Door

    Homework Statement a fire hose is turned on the door of a burning building in order to knock the door down. This requires a force a 1000 N. if the hose delivers 40 kg per second, what is the minimum velocity of the stream needed? assuming the water doesn't bounce back? Homework Equations...
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    What is the average force exerted by a bat on a softball during contact?

    i see..so now i get 80 and then i divded for 0,1 and i get 800 N
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    What is the average force exerted by a bat on a softball during contact?

    Homework Statement a 2 kg softball is pitched to u at 20 m/s. you hit the ball back along the same path, and at the same speed. IF the bat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted? Homework Equations FAT=Pf-pi The Attempt...
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    What factors affect a car's maximum speed on a circular race track?

    because the gravitazional force points upward and the frictional force which is against the gravitazional force...it would be pointing downward
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    What factors affect a car's maximum speed on a circular race track?

    that frictional force point downward ?
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    What factors affect a car's maximum speed on a circular race track?

    the forces are the gravitazional force which points downward, friction force which acts in opposite direction of the car...
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    What factors affect a car's maximum speed on a circular race track?

    i don't really know..i'm lost..
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    What factors affect a car's maximum speed on a circular race track?

    the friction provides the force necessary right? But usually to find this force i need also the mass...
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    What factors affect a car's maximum speed on a circular race track?

    the agent provides the centripetal force...the agent proivdes also the acceleration right?
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    What factors affect a car's maximum speed on a circular race track?

    Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 80 m and the coefficient of friction is 0.40 ? I'm totally lost...hope u guys can help me