A50 kg boy runs and jumps with a forward velocity of 1.5 m/s into a 125 kg stationary boat.
what is the final velocity of the boy/boat system?
a. 0.43 m/s, forward
b. 0.43 m/s, backward
c. 1.1 m/s, forward
d. 1.1 m/s, backward

Natural forces that can alter ecosystems include seasons and climate changes. t or f

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s. t.p.?

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