Acar is traveling on a straight, level road under wintry conditions. seeing a patch of ice ahead of her, the driver of the car slams on her brakes and skids on dry pavement for 50 m , decelerating at 7.5 m/s2 . then she hits the icy patch and skids another 70 m before coming to rest.
a) if her initial speed was 78 mi/h , what was the magnitude of the deceleration on the ice?

Which notation is used to represent an alpha particle? a. b. c. d.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?