What happens to the rotation of a molecular cloud as it collapses to form a star?
A) The rotation rate remains the same at all times.
B) The rotation slows as the cloud collapses.
C) The rotation rate increases as the cloud collapses.
C) The rotation rate increases as the cloud collapses.
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Which portion of the electromagnetic spectrum is used in a microscope?
a) infrared waves b) X rays c) visible light d) ultraviolet light
A golf club exerts an average horizontal force of 1000 N on a 0.045-kg golf ball that is initially at rest on the tee. The club is in contact with the ball for 1.8 ms. What is the speed of the golf ball just as it leaves the tee?
A) 50 m/s B) 30 m/s C) 35 m/s D) 40 m/s E) 45 m/s
The coefficient of volume expansion of a certain olive oil is 0.68 × 10-3 K-1. A 1.0-L glass beaker is filled to the brim with olive oil at room temperature
The beaker is placed on a range and the temperature of the oil and beaker increases by 25 C°. As a result, 0.0167 L of olive oil spills over the top of the beaker. Which of the following values is closest to the coefficient of linear expansion of the glass from which the beaker is made? A) 1 × 10-6 K-1 B) 4 × 10-6 K-1 C) 1 × 10-5 K-1 D) 2 × 10-5 K-1 E) 3 × 10-5 K-1
The neutron is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A) uud B) ddu C) udd D) ttb E) bst