A car is traveling along a freeway at 65 mph. What is the linear speed, relative to the highway, of each of the following points on one of its tires? (a) the highest point on the tire (b) the lowest point on a tire (c) the center of the tire
What will be an ideal response?
(a) 130 mph (b) 0 mps (c) 65 mph
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Force on a Wire: A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod?
A. 1.2 A B. 2.5 A C. 4.9 A D. 9.8 A
Notice the blue ovals (such as those indicated by the arrows) in this image of a galaxy cluster. The oval structures are not really located where they appear to be, but instead are multiple images of a single galaxy that lies directly behind the cluster. What do we call the process that creates these multiple images?
A) gravitational lensing B) cluster image distortion C) the arc effect D) dark energy
The standard unit of mass in the mks system is the
a. meter b. kilogram c. pound d. second e. gram
A car uses gasoline to convert
A) potential energy into radiative energy B) kinetic energy into potential energy C) radiative energy into kinetic energy D) potential energy into kinetic energy