Work is done on an object when
a. it moves in a circle at constant speed
b. it is accelerated in a straight line
c. it is carried horizontally at constant speed
d. all of the above
B
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A model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average acceleration during this time interval?
A. 0.37 
B. 0.50
C. 0.62
D. 0.87
Jupiter's magnetic field is ________ Earth's magnetic field.
A) about 20,000 times as strong as B) about the same strength as C) about twice as strong as D) much weaker than
A wheel accelerates with a constant angular acceleration of 4.5 rad/s2 from an initial angular speed of 1.0 rad/s. (a) Through what angle does the wheel turn in the first 2.0 s, and (b) what is its angular speed at that time?
What will be an ideal response?
A block and a beaker of water are placed side-by-side on a scale (case A). The block is then placed into the beaker of water, where it sinks (case B). How do the two scale readings compare?
1.Scale A reads more than scale B. 2.Scale A reads the same as scale B. 3.Scale A reads less than scale B. 4.Not enough information.