By studying scientists have learned about the layers of the Earth.

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

When an object is heated it contracts. a. true b. false

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is