4.1 A laser Doppler velocimeter (LDV) measures a velocity of 8 m/s as water flows in an open channel. The channel has a rectangular cross section of 0.5 m by 0.2 m in the flow direction. If the water density is a constant 998 kg/m3, determine the mass flow rate, in kg/s.

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

What is the equation for electrical work?