Physics, 25.01.2020 06:31 AngelH2650
Amarching band consists of rows of musicians walking in straight, even lines. when a marching band performs in an event, such as a parade, and must round a curve in the road, the musician on the outside of the curve must walk around the curve in the same amount of time as the musician on the inside of the curve. this motion can be approximated by a disk rotating at a constant rate about an axis perpendicular to its plane. in this case, the axis of rotation is at the inside of the curve. consider two musicians, alf and beth. beth is four times the distance from the inside of the curve as alf. knowing that: (a) if beth travels a distance s during time δt, how far does alf travel during the same amount of time= (1/4)s? (b) if alf moves with speed v, what is beth's speed? speed, in this case, means the magnitude of the linear velocity, not the magnitude of the angular velocity. a) 4v b) v c) v/4
Answers: 2
Physics, 22.06.2019 06:40
How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.
Answers: 1
Physics, 22.06.2019 15:20
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
Answers: 2
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