Figure Q4 shows the track of a roller coaster. If the track is to be designed so that the passengers of the roller coaster do not experience a normal force equal to zero or more than 5 times their weight, determine the limiting heights h, and hc so that this does not occur. The roller coaster starts from rest at position A. pB and pc are radii of curvature of the track at locations B and C, respectively. Neglect friction.

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A 20-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, brings the block to rest at point B, 19 m to the right of point A. What is the coefficient of kinetic friction, Hk, of the surface from A to B? 5.0 m A 19 m 0.11 0.52 0.26 0.33 0.47

Suppose a toy car experiences two horizontal forces: A time-dependent force from its motor of F = 2.0e-0.5tN, and kinetic friction with a coefficient of u = 0.1 from its wheels and bearings. What will its maximum speed be on level ground if it starts from rest? %3D %3D

A 35.0-kg child swings in a swing supported by two chains, each 2.98 m long. The tension in each chain at the lowest point is 440 N. (a) Find the child's speed at the lowest point.m/s(b) Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)N (upward)

A 40 N box is resting on a table when a 20 N force is applied to it horizontally. The coefficients of static and kinetic friction are 0.3 and 0.1, respectively. Which of the following best describes the resulting motion of the box?    The motion of the box cannot be determined with the given information.      The box accelerates in the direction of the applied force.      The box remains at rest.      The box moves with a constant velocity in the direction of the applied force.

In the situation below, m1=20 kg and m2=10 kg. The masses are at rest. A) What is the minimum coefficient of friction between the incline and m1? B) The sting and cut and m1 slides down the incline. What is its speed when it reaches the bottom? The block is initially at height of 10 meters.

A cannonball has just been shot out of a cannon aimed 45∘ above the horizontal rightward direction. Drag forces cannot be neglected.Which way does drag point? I thought it points opposite of the direction of the motion.