48 grams of oxygen at room temperature consists of how many moles?
a. 3.0
b. 1.5
c. 0.75
d. more than 3.0
e. less than 0.75
b
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Constant Acceleration Kinematics: A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of 42 m/s. The train then moves at a constant velocity of 42 m/s for 420 s. The train then slows down uniformly at 0.065 m/s2, until it is brought to a halt. The acceleration during the first 5.6 km of travel is closest to which of the following?
A. 0.16 m/s2 B. 0.14 m/s2 C. 0.17 m/s2 D. 0.19 m/s2 E. 0.20 m/s2
If a new wave arrives on shore every two seconds, then its frequency is 2 Hz
Indicate whether the statement is true or false
In an electromagnetic wave, the electric and magnetic fields are oriented such that they are
A) parallel to one another and perpendicular to the direction of wave propagation. B) parallel to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) perpendicular to one another and parallel to the direction of wave propagation.
Which of the following statements about degeneracy pressure is not true?
A) Degeneracy pressure keeps any protostar less than 0.08 solar mass from becoming a true, hydrogen-fusing star. B) Degeneracy pressure can halt gravitational contraction of a star even when no fusion is occurring in the core. C) Degeneracy pressure is a consequence of the laws of quantum mechanics. D) Degeneracy pressure varies with the temperature of the star.