a boat travel due East with at 40metre per second across a river flowing due South 30metre per Second. what is the resultant speed of the boat

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

What is a possible result of higher air temperature caused by global warming