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Before attempting this problem, review Examples 7 and 8. Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle 8. A car can safely travel along the unbanked curve at a maximum speed vo under conditions when the coefficient of static friction between the tires and the road is 0.840. The banked curve is frictionless, and the car can negotiate it at the same speed vo. Find the angle of the banked curve. Number Units
A 245-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 18.9° below the horizontal. The coefficient of kinetic friction is 0.292. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero? Number i Units
Rocket's A 65.0-kg mountain climber just ate a Johnny bacon-cheddar-double-burger meal along with two peanut butter milkshakes, which have 5810 Calories (5810 kilocalories). Assume she can convert these calories into energy with 100% efficiency and use the fact that 1 kcal = 4186 J. Calculate how many times she could climb up Mt. Everest - the world's tallest mountain. The height of Mt. Everest is 8840 m. Number Units î
The drawing shows a skateboarder moving at 7.80 m/s along a horizontal section of a track that is slanted upward by 0 = 53.0° above the horizontal at its end, which is 0.530 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track. Number 7.80m/s i Units H 0.530m