A student claims that all objects exert a gravitational force on one another. However, it is difficult to observe the effect of the force of gravity unless the mass of one of the objects is very large. Which
observation best supports the student's argument?
A. Earth spins on its axis at a constant speed.
B. The masses of the Moon and Earth are constant.
C. The Moon stays in orbit around Earth.
D. The solar system has moons of different masses.

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Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. 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. the block's initial mechanical energy is 9.472 j. 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.

Is a copper wire a conductor or insulator?