Carbon-14 is a naturally-occuring, stable isotope that is commonly used is scientific studies as a tracer and to date artifacts. using the periodic table, predict the number of electrons, neutrons, and protons in carbon-14. a) carbon-14 contains 7 electrons, 7 neutrons, and 7 protons. b) carbon-14 contains 6 electrons, 8 neutrons, and 6 protons. c) carbon-14 contains 6 electrons, 8 neutrons, and 7 protons. d) carbon-14 contains 7 electrons, 8 neutrons, and 9 protons.

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.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Energy flows from the producer level to the level. is called