When throwing a ball straight up, which of the following is true about its velocity and acceleration at the highest point in its path?
A. both v = 0 and a = 0
B. v ? 0, a = 0
C. v = 0, a ? 0
D. v ? 0, a ? 0
E. not really sure
C. v = 0, a ? 0, you can’t turn off gravity!
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A transverse periodic wave is represented by the equation y(x, t) = 2.50 cm cos(2,500 rad/s t - 15.0
x). What is the direction of the vibration of the wave?
A. the z direction B. the y direction C. the x direction
Evaporation is when a gas is converted into a liquid
a. True b. False Indicate whether the statement is true or false
The energy per unit volume in an EM wave is
A) equally divided between the electric and magnetic fields. B) almost entirely in the electric field. C) indeterminate. D) almost entirely in the magnetic field. E) zero.
A single-shell-eight-tube-pass heat exchanger is used in a power plant to preheat 55ºF water to 80ºF by using 190ºF hot water and cooling it to 160ºF. If the overall heat exchanger conductance is 400 Btu/hr?ft^2 ?0F and if 1800 lbm/min of 55ºF water is preheated, determine (a) mass flow of the hot water and (b) surface area of the heat exchanger.
What will be an ideal response?