A 12kg box is sliding along a horizontal surface while experiencing a rightward applied force of +50 N and a leftward force of friction of -26 N. The box has a displacement of 20 meters.

Modify the equation fδt=δ (mv) to find the force of friction.

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

The energy of a photon was found to be 3.38 × 10–19 j. planck’s constant is 6.63 × 10–34 j • s. which color of light corresponds to this photon?