Why is it recommended that if you are lifting a heavy object you should lift it as close to your body as possible?
What will be an ideal response?
By doing so you minimize the lever arm and the torque on your elbows and arms and so you avoid a potential strain injury to joints and muscles.
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Suppose we look at a photograph of many galaxies. Assuming that all galaxies formed at about the same time, which galaxy in the picture is the youngest?
A) the one that is farthest away B) the one that is reddest in color C) the one that is bluest in color D) the one that is closest to us E) the one that appears smallest in size
How far from a lens of focal length 50.0 mm must the object be placed if it is to form a virtual image magnified in size by a factor of three?
A) 33.3 mm B) 48.0 mm C) 38.3 mm D) 42.2 mm E) 54.4 mm
The initial rise off the main sequence in stage 8 comes from gravitational energy of the contracting helium core
Indicate whether the statement is true or false
Our Sun is a star of spectral type ________
A) M B) F C) S D) G