A ball is projected upward at time t = 0.0 s, from a point on a roof 60 m above the ground. The ball rises, then falls until it strikes the ground. The initial velocity of the ball is At time what is the acceleration of the ball? Neglect air resistance. zero -9.8 m/s2 +9.8 m/s2 +4.9 m/s2

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2

The energy produced as a result of this flow of electrons from atom to atom is called

Diverging mirrors and lenses always produce images