Asolid 0.4550 kg ball rolls without slipping down a track toward a vertical loop of radius r = 0.6750 m . what minimum translational speed v min must the ball have when it is a height h = 1.021 m above the bottom of the loop in order to complete the loop without falling off the track? assume that the radius of the ball itself is much smaller than the loop radius r . use g = 9.810 m/s 2 for the acceleration due to gravity.

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)