A concave mirror has a 12 cm tall object placed 40 cm in front of it. An image forms 60 cm in front of the mirror. What is the size and orientation of the image?
A. 8.0 cm, inverted
B. 8.0 cm, upright
C. 18 cm, inverted
D. 18 cm, upright
E. 24 cm, upright
C. 18 cm, inverted
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A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
A. on all three. B. only on the book. C. only on the chair. D. upwards on the chair and downwards on the book. E. only on the objects that you have defined to be part of the system.
Sarah drives at a constant speed of 15 m/s around a circular horizontal curve of diameter 60 m. What are the magnitude and direction of her acceleration?
What will be an ideal response?
If a quantity is conserved, it means that it
Choose one: A. can be saved for a later time. B. changes only if an external force acts. C. changes only if an internal force acts. D. it doesn't change.
A spring with spring constant k = 800 N/m is extended 12 cm from its equilibrium position. A spring with 6.0 cm extension from equilibrium will have the same potential energy as the first spring if its spring constant is
a. 200 N/m. b. 400 N/m. c. 800 N/m. d. 1 600 N/m. e. 3 200 N/m.