A truck is traveling down a steady slope such that for each 1 m the truck goes forward along the slope it goes down 0.04 m (we call this a 4% grade). Imagine that the truck’s brakes fail. What is the approximate increase in the truck’s speed after 30 s, assuming that the engine is not used and there is little drag or other friction? 
22 (mi/h)/s.]
A. 0.9 mi/h
B. 11 mi/h
C. 26 mi/h
D. 53 mi/h
E. 660 mi/h
F. Other (specify)
C. 26 mi/h
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Galileo determined that ____
a. heavy objects accelerate at a slower speed than lighter objects b. lighter objects accelerate at a slower speed than heavier objects c. an object's acceleration is due to the height from which it is dropped d. all objects fall at a constant speed e. all objects fall at a constant acceleration
In ________ stars most of the electrons in the hydrogen atom are above level 2 and in ________ stars most of the electrons are below level 2, therefore the ________ are essentially absent in both types.
A. type O; type A; emission lines B. type M; type A; absorption lines C. type A; type M; emission lines D. type M; type O; Balmer lines E. type O; type M; Balmer lines
What is different about locating images in convex mirrors compared to locating images in concave mirrors?
a. Among many differences, ray diagrams do not work for convex mirrors. b. Convex mirrors require more rays for a minimum ray diagram. c. Everything is the same except that the focal point is located behind the mirror. d. Because convex mirrors have no focal point, rays must be constructed differently. e. Because convex mirrors have no optic axis, rays must be constructed differently.
Force on a Moving Charge: An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component
A. along the +z-axis B. along the -z-axis C. along the -x-axis D. along the +y-axis E. along the -y-axis