If a photon has a frequency of 1.15 × 1015 hertz, what is the energy of the photon?
Given: Planck's constant is 6.63 × 10-34 joule·seconds.

A.
5.82 × 10-49 joules
B.
7.62 × 10-19 joules
C.
8.77 × 10-12 joules
D.
1.09 × 10-12 joules

A12-kg bag of groceries is tossed onto a table at 4.0 m/s and slides to a stop in 2.2 s . modify the equation fδt=δ (mv) to find the force of friction.

Acricket ball of 70g moving with a velocity of 0.5 m/s is stopped by a player in 0.5s what is the force applied to stop the ball

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.