All specimens of a pure ______________ have identical properties and composition
Fill in the blank(s) with correct word
substance
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In the Doppler effect for electromagnetic waves, which of the following gives the greatest shift in frequency?
a. the source moving toward the non-moving observer at speed v b. the observer moving toward the non-moving source at speed v c. the source moving toward the approaching observer, both at speed v /2 d. All of the above give the same shift.
A very light ideal spring stretches by 21.0cm when it is used to hang a 135-N object. What is the weight of a piece of electronic equipment that would stretch the spring by 44.9cm if you hung the equipment using the spring?
A) 405 N B) 289 N C) 176 N D) 63 N
The diagram shown illustrates the location of the Solar System's eight planets and three large dwarf planets. Sort each object according to its basic composition.
What will be an ideal response?
Energy Conservation With Conservative Forces: In a museum exhibit of a simple pendulum, a very small but dense 6.0-kg ball swings from a very light 2.5-m wire. The ball is released from rest when the pendulum wire makes a 65° angle with the vertical, and it swings in a circular arc with no appreciable friction or air resistance. What is the tension in the wire just as the ball swings through its lowest position?
A. 11 N B. 59 N C. 68 N D. 130 N E. 0 N