As the volume of an ideal gas is increased at constant pressure the average molecular speed:
A. increases
B. decreases
C. increases at high temperature, decreases at low
D. decreases at high temperature, increases at low
E. stays the same
Answer: A. increases
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At the Fermilab accelerator in Weston, Illinois, singly-charged ions with momentum 3.3 × 10^?16 kg?m/s are held in a circular orbit of radius 1.00 km by an upward magnetic field. What B field must be used to maintain the ions in this orbit? (qion = 1.60 × 10^?19 C)
a. 5.3 T b. 2.1 T c. 2.1 T d. 0.19 T e. 0.48 T
In a classroom on the first spaceship to an extrasolar planet--there are children because the trip will take 200 years--a teacher is showing charge Q uniformly distributed along a conducting rod of length L0 to produce linear charge density ?0. As observed on Pluto when the spaceship passes it at 0.800c, the linear charge density 
is
A. 0.360 ?0. B. 0.600 ?0. C. 0.800 ?0. D. 1.00 ?0. E. 1.67 ?0.
Newton's Second Law in 1 Dimension: A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is
A. 3000 kg. B. 2880 kg. C. 144 kg. D. 0.200 kg. E. 5.21 kg.