Which law does this diagram illustrate?
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a.
elliptical paths, such as those followed by planets around the sun, take longer when the smaller object (the planet) is closer to the larger object (the sun) due to the universal force of gravity.

b.
as planets orbit the sun, they follow an elliptical path with the sun as one focus. the path takes a greater amount of time closer to the sun than farther away from it.

c.
the space-time warp causes the grid areas at each of the two foci to be of unequal size when the planet travels its elliptical path.

d.
as planets orbit the sun, they follow an elliptical path with two foci. an equal area is swept out in an equal amount of time by the planet at both foci.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

What is the angular momentum of the bar about the axle?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c