White light consisting of wavelengths 380nm < 1< 750 nm is incident on a lead surface. For which one of the following ranges of wavelength will photoelectrons be emitted from the
elad surface that has a work funcation W. = 6.63 x 10-29 J?

Awheelhas a radius of 4.8 m. howfar (path length) does a point on the circumference travel if thewheel is rotated through angles of 30°, 30 rad, and 30 rev,respectively?

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

What causes the formation of ocean currents?