Aparticle's trajectory is described by x =(12t3−2t2)m and y =(12t2−2t)m, where t is in s.
what is the particle's speed at t=0s ? what is the particle's speed at t=5.0s ? express your answer using two significant figures. what is the particle's direction of motion, measured as an angle from the x-axis, at t=0 s ?
express your answer using two significant figures. what is the particle's direction of motion, measured as an angle from the x-axis, at t=5.0s ?
express your answer using two significant figures.
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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
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A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.
Answers: 2
Aparticle's trajectory is described by x =(12t3−2t2)m and y =(12t2−2t)m, where t is in s.
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