Which of the following is an example of a true "wave", as that word is used in physics?

A) A water wave that is coming into the beach, like the waves that surfers use to surfboard on
B) A stream flowing downhill over rocks
C) Both of the above.
D) None of the above.


D

Physics & Space Science

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According to the impulse-momentum relationship Ft = change in mv, a falling bungee jumper has momentum which is reduced by the force F exerted by the bungee cord. If v is the speed of the jumper, then m in the equation is the mass of the

A) jumper. B) cord. C) ground below. D) none of the above

Physics & Space Science

A historical science: Scientists in many fields can test their hypotheses by proposing and carrying out experiments in which they can change variables in a controlled fashion

Astronomers, however, cannot adjust the properties of the objects they study. In what sense, then, can astronomers still conduct experiments?

Physics & Space Science

Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion from this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which steps does the internal energy of the system increase?

a. 1 and 2 b. 3 and 4 c. 1 and 3 d. 2 and 4

Physics & Space Science

How high will the pendulum bob swing in this figure?

a. To the height of the pencil's point. b. To the maximum height of the bob without the pencil, as shown by the left-most position in the figure. c. Roughly half the height described in choice b. d. Midway between a. and b. e. To the height of the pencil eraser.

Physics & Space Science