A car of mass 1500 kg is negotiating a flat circular curve of radius 50 m with a speed of 20 m/s. a. The source of centripetal force on the car is (1) the weight of the car, (2) the normal force on
the car, or (3) the static friction force.
b. What is the magnitude of the centripetal acceleration of the car?
c. What is the magnitude of the centripetal force on the car?
d. What is the minimum coefficient of static friction between the car and the curve?
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The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?