How many photoelectrons are ejected per second in the experiment represented by the graph? ((picture)) Express your answer using two significant figures.

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Awind turbine is initially spinning at a constant angular speed. as the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.173 rad/s2. after making 2870 revolutions, its angular speed is 132 rad/s. (a) what is the initial angular velocity of the turbine? (b) how much time elapses while the turbine is speeding up?

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .