Lasers are used
a. to produce holograms
b. in surgery
c. to measure distances between objects accurately
d. in DVD and compact disc players
e. all of the above
E
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A train station bell gives off a fundamental tone of 500 Hz as the train approaches the station at a speed of 30.0 m/s. If the speed of sound in air is 339 m/s, what will be the apparent frequency of the bell to an observer riding the train?
a. 456 Hz b. 544 Hz c. 250 Hz d. 530 Hz e. 339 Hz
Suppose you have a small cart at rest. You have two different objects that you might throw at the cart to get it moving: a 57-g tennis ball and a 57-g lump of sticky clay. Other things being equal, which should you throw at the cart to maximize the cart’s final speed?
A. The tennis ball B. The clay C. It doesn’t matter: both will have the same effect.
The figure shows a graph of the velocity as a function of time for a basketball player traveling up and down the court in a straight-line path. For the 10 s shown on the graph, find (a) the net displacement of the player. (b) the total distance run by the
What will be an ideal response?
A double-paned window consists of two 60.0 cm × 100 cm glass panes, 2.00 mm thick, separated by a 1.50 cm layer of still air. 25.0 W of heat flow through the window
What is the temperature difference between the indoors and outdoors? The thermal conductivity of glass is 0.840 W/(m•K), and that of air is 0.0234 W/(m•K). A) 27.6 K B) 27.3 K C) 26.9 K D) 26.7 K E) 26.3 K