Polypropylene forms from the monomer CH3CH=CH2. Show the structure of the polymer, in the usual “bracket” format
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The sky is blue due to air molecules scattering sunlight in all directions
a. True b. False Indicate whether the statement is true or false
The initial mass of a protostar generally determines the star's future evolution. But in some cases, what can alter this process?
A) The star may be isolated in space, far from other influences. B) The star may gain mass by passing through a dark cloud. C) The star may be in a spectroscopic binary system. D) The star may drift away from the other stars in its formation cluster. E) The star may collide with another, unrelated star.
A race car enters a flat 200-m radius curve at a speed of 20.0 m/s while increasing its speed at a constant 2.00 m/s2. If the coefficient of static friction is 0.700, what will the speed of the car be when the car begins to slide?
A) 36.2 m/s B) 24.3 m/s C) 37.1 m/s D) 28.7 m/s E) 31.5 m/s
A beam is pin-connected to the tops of two identical pipe columns, each of height h, in a frame. The frame is restrained against sidesway at the top of column 1. Only buckling of columns 1 and 2 in the plane of the frame is of interest here. The ratio (a/L) defining the placement of load Qcr, which causes both columns to buckle simultaneously, is approximately:
(A) 0.25
(B) 0.33
(C) 0.67
(D) 0.75
