Segmented mirrors sag under their own weight. Their optical shape must be controlled by computer-driven thrusters under the mirrors in what is called
a. an achromatic lens.
b. active optics.
c. a Schmidt-Cassegrain design.
d. a Newtonian design.
e. interferometry.
Question 2
If the stars at the turnoff point of a cluster have a mass of 3 M, what is the age of the cluster?
a. 3.0 x 1010 years
b. 3.3 x 109 years
c. 6.4 x 108 years
d. 1.6 x 1011 years
e. The age of a star cluster can not be determined from the mass of stars at the turnoff point.
The electrophoretic mobility of a protein on an SDS polyacrylamide gel is related to its molecular w
Workshop of Kane Kwei, Coffin in the shape of a film projector, Teshi area, Ghana, Africa. 2013.
Measuring the Weight and Length of an Infant
Typical computer-controlled diesel engine fuel injectors.
The diminishing effects on body weight of a low-calorie diet and a high-calorie diet.
A container in the shape of a right circular cylinder with no top has surface area square feet.