Electromagnetic waves with wavelength 3.05 x 10-11 m are directed at a piece of zinc, and electrons are ejected from the zinc. The work function of the zinc is 4.30 eV = 6.89 x 10-19 J. What is the maximum speed (in m/s) with which electrons are ejected from the zinc? Please provide an answer accurate to three significant figures.

The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.

What is the mass of the same rock on the earth

Ameter stick is pivoted at the 0.50-m line. a 3.0-kg object is hung from the 0.15-m line. where should a 5.0-kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?