Recent content by kapopka88

The manufacturer of a 12V car headlight specifies it will draw a current of 6A. You would like to check this claim with an ammeter designed to measure currents up to 10A and having a resistance of 0.1 Ohms. Which of the two figures below represents a circuit where the ammeter correctly measures...

the magnitude of the centripetal force

so, so far i have F=mv^2/R, v=sqrt(2g(r-h)), and sin(x)=h/r

sin(theta)=h/r

i set the centripetal force equal to gravity to solve for v, then plugged v into my first equation to get height but that was not right.

so, centripetal force =0, so gravity must produce his centripetal acceleration. how do we find the radial component with no angle?

v=sqrt(2g(r-h))

oh centripetal force is also acting on him before he looses contact

i really have no idea where to start. the velocity at that point is very small and the acceleration would be positive, the position would be a height less than 2.6 but that's all i can figure out.

A boy is initially seated on the top of a hemispherical ice mound of radius R = 2.6 m. He begins to slide down the ice, with a negligible initial speed (Fig. 8-47). Approximate the ice as being frictionless. At what height does the boy lose contact with the ice?