A model roller coaster car weighing 300 Kg is accelerated with a constant force F between points A and B over a period of 1.5 seconds. When the car gets to point C, the normal force exerted by the track on the car is in the downward direction and equal in magnitude to the weight of the car. (i) Determine the magnitude of F. (ii) determine the maximum height reached by the car on the upward slope. The radius of curvature of the loop is 10 m. Neglect friction losses.

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?

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