An Atwood’s machine consists of blocks of masses m1=10.0 kg and m2 = 20.0 kg attached by a cord running over a pulley as in the figure below: The pulley is a solid cylinder with mass M=8.00 kg and radius r=0.200 m. The block of mass m2 is allowed to drop, and the cord turns the pulley without slipping. a) Why must the tension T2 be greater than the tension T1? b) What is the acceleration of the system, assuming the pulley axis is frictionless? 6 c) Find the tensions T1 and T2.

How are period and frequency related to each other? dperiod is the reciprocal of frequency.

Ray 2 should cross through the focal point on the right side of the lens

Answer4 million;

Stars are born within the clouds of dust and scattered throughout most galaxies. a familiar example of such as a dust cloud is the orion nebula. turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. as the cloud collapses, the material at the center begins to heat up. known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the milky way are paired or in groups of multiple stars.therefor, i would say the answer is: dust and gases contract.i hope this ! < 3