Question details:

question details:
a spere of matter, of mass m andradius a, has a concentric
cavity of radius b, as shownbelow.
a.) sketch a curve of thegravitational force f exerted by the
sphere on a particle of massm, located at a distance r from the
center of the sphere, as afunction of r in the range 0 < = r < =
infinity. consider r = 0, b, and and infinity in particular.
b.) sketch the correspondingcurve for the potential energy
u(r) of thesystem.

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?