A man can row a boat at the rate of 4 km/h in still water. If he rows the boat in a river where there is a water current of 3 km/h, find his net velocity and draw a vector diagram for each situation: a. as he rows with the current
b. as he rows against the current
c. as he rows across the stream

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

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.

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.