Sit on the floor with your legs straight out, raise your straight arm out with your thumb up such that your thumb aligns with one of your big toes, rapidly blink your left and right eye, and observe how your big toe appears to shift positions. This demonstration is an example of _________________
a. Newton's first law b. uniform circular motion
c. parallax d. retrograde motion
c
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When liquids change to a solids, they
A) absorb energy. B) release energy. C) both of these D) neither of these
Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
a. 58 V b. 63 V c. 43 V d. 84 V e. 11 V
In a vacuum the speed of light waves compared to the speed of radio waves is
A. faster B. slower C. the same
A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 35.0 m/s every second to keep a 1 500-kg helicopter aloft?
a. 42.9 kg b. 420 kg c. 430 kg d. 410 kg e. 415 kg