Amino acids found in protein in life on Earth are
A) a unequal mixture of left-handed and right-handed molecules, left-handed being most abundant
B) all left-handed molecules
C) all right-handed molecules
D) an equal mixture of left-handed and right-handed molecules
B
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Using an integral to calculate a sum over f (n) (where n is an integer) is a good approximation when
A. the summed values f (n) are individually small. B. the value of f (n) varies only very slowly with n. C. the value of f (n) goes to zero as n goes to infinity. D. the value of f (n) goes to zero as n goes to zero. E. All of the conditions above are true.
A car moving at 10.0 m/s encounters a depression in the road that has a circular cross-section with a radius of 30.0 m. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A) 200 N B) 389 N C) 789 N D) 489 N E) 589 N
Blue stars are hotter than red stars
Indicate whether the statement is true or false
A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground
The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?