An ideal gas occupies 6.00 × 102 cm3 at 20°C. At what temperature will it occupy 1.20 × 103 cm3 if the pressure is held constant?
A) 10°C
B) 40°C
C) 100°C
D) 313°C
D
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Two identical springs with spring constant 50 N/m support a 5.0-N weight as in the picture below. What is the tension in spring A?
?
?
A. 1.45 N B. 2.50 N C. 2.89 N D. 3.75 N E. 5.00 N
If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?
a. Galaxy A is four times closer than Galaxy B. b. Galaxy A is four times further away than Galaxy B. c. Galaxy A is twice as distant than Galaxy B. d. Galaxy A is twice as close than Galaxy B.
When an object is dropped from a tower, what is the effect of the air resistance as it falls?
a. It does positive work. c. It increases the object's potential energy. b. It increases the object's kinetic energy. d. None of the above choices are valid.
A visual binary star system has rotation period, P = 10 years. The semi-major axis of the orbit of one of the stars is 5 AU. What is the combined mass of the binary star system?
A. 40 solar masses B. 0.4 solar masses C. 8 solar masses D. 4 solar masses E. 200 solar masses