Planets are not uniform inside. Normally, they are densest at the center and have decreasing density outwards toward the surface. Model a spherically symmetric planet, with the same radius as Earth, as having a density that decreases linearly with distance from the surface. Let the density be 15000 kg/m3 at the center and 2000 kg/m3 at the surface. What is the acceleration due to gravity at the surface of this planet

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n