Which of the following is a true statement about objects in a vacuum?
a. a feather will fall faster than a bowling ball.
b. a feather will fall slower than a bowling ball.
c. a feather and a bowling ball will fall at the same rate.
d. both a feather and a bowling ball can't fall, but will always remain motionless.

Which describe reflection? check all that apply. light bounces off a boundary.

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.