To investigate the nature of heat produced during the boring process, Count Rumford placed a dull boring tool and a brass cylinder in a barrel filled with cold water. The boring tool was forced against the bottom of the cylinder and rotated by two horses as shown in this figure. What would happen if the water used to cool the bore of the cannon were not replenished while the horses continued to
provide mechanical energy?
a. The temperature of the water would decrease as the temperature of the cannon bore increases.
b. The temperature of the water would increase until it boils and evaporates.
c. It would cause less resistance and the horses will not be able to transmit as much energy though work.
d. Only a limited amount of heat can be extracted from the apparatus during a given session, so whether all the water boils away depends on how much water is used.
e. Work and heat are distinct, so there is no significant effect on the water.
b
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Triple pane window glass has been used in some building construction. Triple pane glass is a set of three glass panels, each separated by a sealed air gap. Estimate the R-Value for triple pane windows and compare this to the R-Value for single pane glass.
What will be an ideal response?
A quantum particle
a. can be localized in space. b. can be represented by an infinitely long wave having a single frequency. c. can be represented by a wave packet. d. travels at the phase speed of the infinitely long wave having the highest frequency. e. has the highest probability of being present in those regions of space where its component waves interfere destructively.
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
This figure shows the life track of a 1 solar-mass star from its beginnings in a collapsing cloud fragment until it becomes a main-sequence star. At which of the numbered points is the object generating energy primarily from hydrogen fusion?
A) Point 4 only B) Point 1 only C) Point 2 only D) Point 3 only E) Points 1, 2, and 3 F) Points 1 and 2 only