Ahot-air balloon is rising upward with a constant speed of 2.03 m/s. when the balloon is 8.13 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. how much time elapses before the compass hits the ground?

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)