According to Newton’s first law, when pushing a penny across a table, the penny will slide to the edge of the table and fall off. However, if the force is not strong enough, the penny will stop on the table. The force that stops the penny on the table is: a. Air
b. Friction
c. The force of the table
d. Gravity

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

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 law of reflection states that the angle of reflection is equal to the angle of