Why aren't there young stars in the halo?
What will be an ideal response?
The halo contains virtually no dust, so star formation there ceased very long ago.
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A marble has a diameter of 2 cm. At what distance would the marble have an angular diameter of 1 arc second
a. 4.1 cm b. 4.1 miles c. 4.1 m d. 4.1 ft e. 4.1 km
Earth and Venus have more substantial atmospheres because they are larger and had more volcanic activity.
Answer the following statement true (T) or false (F)
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with
the eyepiece adjusted for minimum eyestrain. The near-point distance of the person using the microscope is 25.0 cm. What is the final magnification of the microscope? A) -190 B) -240 C) -300 D) -310 E) -470
If one were told the object's initial velocity then one could calculate the work done by using the equations for constant acceleration to find the distance traveled. What is the magnitude of the change in the object's momentum?
a. 150 kg m/s b. 50 kg m/s c. 75 kg m/s d. undetermined—not enough information given e. none of the above