Many meteorites appear to have formed very early in the solar system's history. How do these meteorites support our theory about how the terrestrial planets formed?
A) The meteorites sizes are just what we'd expect if metal and rock condensed and accreted as our theory suggests.
B) The meteorites appearance and composition is just what we'd expect if metal and rock condensed and accreted as our theory suggests.
C) Their overall composition is just what we believe the composition of the solar nebula to have been: mostly hydrogen and helium.
D) Their appearance and composition matches what we observe in comets today, suggesting that meteorites were once pieces of icy planetesimals.
B
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Plus and minus signs are used in one-dimensional motion to indicate direction. What is the sign of an acceleration that reduces the magnitude of a negative velocity? Of a positive velocity?
A. For negative velocity a positive acceleration will increase the magnitude of the velocity. For positive velocity a negative acceleration will reduce the magnitude of the velocity. B. For negative velocity a positive acceleration will reduce the magnitude of the velocity. For positive velocity a negative acceleration will reduce the magnitude of the velocity. C. For negative velocity a negative acceleration will reduce the magnitude of the velocity. For positive velocity a negative acceleration will reduce the magnitude of the velocity. 2. if an object is thrown straight up and air resistance is negligible, then (a) what will be its speed when it returns to the starting point on the ground? (b) If air resistance were not negligible, then how would the maximum height to which it rises be affected? a) The final return accelerati0on on the ground will be the same as the initial value. (b) The minimum height will be lower. b) The final return speed on the ground will not be the same as the initial speed. (b) The maximum height will be lower. c) The final return speed on the ground will be the same as the initial speed. (b) The maximum height will be lower.
A constant force is acting on an object. Which of these graphs best represents the acceleration of the object?
A. 
B. 
C. 
The maximum torque on a current carrying loop occurs when the angle between the loop's magnetic moment and the magnetic field vector is
A) 0° B) 45° C) 90° D) 180° E) none of the given answers
Thin Lenses: A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image?
A. The image is real, 2.5 cm tall, 30 cm on the same side as object. B. The image is virtual, 2.5 cm tall, 30 cm on the other side of the lens. C. The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens. D. The image is virtual, 4.0 cm tall, 60 cm on the same side as object. E. The image is real, 4.0 cm tall, 60 cm on the other side of the lens.