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    Radial acceleration, help needed

    Homework Statement A car at the Indianapolis 500 accelerates uniformly from the pit area, going from rest to 320km/h in a semicircular arc with a radius of 200 m. Determine the tangential and radial acceleration of the car when it is halfway through the arc, assuming constant tangential...
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    Rounded top hill question

    Homework Statement a 1000kg sports car moving at 20m/s crosses the round top of a hill (radius of 100 m) . Determine the normal force on the car Homework Equations Newton’s second law F=ma The Attempt at a Solution I figured out the centripetal acceleration Ac= v^2/r = 4 m/s^2 My attempt...
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    Car on a bank problem need help ?!!

    Homework Statement If a curve with a tedious of 80m is perfectly banked for a car traveling 70km/h, what must be the coefficient of static friction for a car not to skid when traveling at 90 km/h ? Homework Equations Newton’s second law F=ma The Attempt at a Solution To find the angle of the...
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    Gravitational problem, spacecraft orbital period

    Homework Statement I need help getting started with this problem At what altitude above the surface of the Moon must a lunar module orbit in order to complete each orbit in 1 h 49 min 39 s? Homework Equations g= Gm/r^2 ? The Attempt at a Solution Not quite sure how to start or anything , any...
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    Projectile problem on Pluto

    Homework Statement An astronaut throws a rock at 12 m/s at an angle of 25° above horizontal from a height of 3.25 m above the surface. How far horizontally does the rock travel before hitting the surface of Pluto? Pluto has a mass of 1.27 E22 kg And a radius of 1.14E6 m Homework Equations...
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    Roller coaster problem involving velocity

    Homework Statement A roller coaster reaches the top of the steepest hill with a speed of 7.0 km/h. It then descends the hill, which is at an average angle of 43° below horizontal and is 46.0 m long. What will its speed be when it reaches the bottom? Assume the coefficient of kinetic Friction...
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    Vectors problem

    Homework Statement I’m working on a problem that requires adding 3 vectors . And while I was following the book, it said to find the angle to divide the y over the x components of the resistant , and showed the angle to be -1.25 but then follow d to change to -51 . How did it change ? The book...
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    Find the force to push a book sideways on a table

    Homework Statement Place a book flat on a table and press down on it with your hand. Now suppose the hand-book and table- book values of are 0.50 and 0.40, respectively; the book's mass is 0.90 kg and your downward push on it is 10 N. How much horizontal force is needed to keep the book moving...
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    Find minimum stopping distance

    Homework Statement A crate is being transported on a flatbed truck. The coefficient of static friction between the crate and the bed is 0.470. What is the minimum stopping distance if the truck, traveling at 70 km/h, is to decelerate uniformly and the crate is not to slide forward on the bed...
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    Solve for the tension in a rope pulling a box

    Homework Statement A worker is going to attempt to pull a 90-kg box across a level floor by a rope that makes an angle of 35° with the floor. The tension in the rope is gradually increased until the box just starts to move. If the coefficient of kinetic friction is 0.36 and the coefficient of...
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    Determine the elevator's acceleration

    Homework Statement An 82 kg man inside a 40-kg dumb-waiter pulls down on the rope. At that moment the scale on which he is standing reads 209 N. Determine the elevator's acceleration. Homework Equations F=ma The Attempt at a Solution I know the acceleration is 0.152 m/s^2 upwards , I need...
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