1. A student using a stopwatch finds that the time for
10 complete orbits of a ball on the end of a string
is 25 seconds. The period of the orbiting ball is
A 25 sec
B 2.0 sec
C. 2.5 sec
D. 5.0 sec

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

What happens in a global convection cell

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.