A 300-g glass thermometer initially at 25°C is put into 200 cm3 of hot water at 95°C. Find the final temperature (in °C) of the thermometer, assuming no heat flows to the surroundings. (The specific heat of glass is 0.2 cal/g/°C.)
a. 52
b. 68
c. 89
d. 79
e. 36
d
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Electrons are accelerated through a potential difference of 90.0 kV and directed at a tungsten target to produce x-rays. What is the shortest wavelength of the x-rays produced?
A. 669 pm B. 508 pm C. 72.6 pm D. 13.8 pm E. 14.3 pm
To store 80 mJ of energy in a 100
F capacitor, what voltage is necessary?
A. 10 V B. 45 V C. 4.0 V D. 40 V E. more than 120
100 grams of molten lead (600°C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21°C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g×°C; the latent heat of fusion and the melting point of lead are 2.45 × 10^4 J/kg and 327°C.)
a. -145 b. -252 c. -302 d. -429 e. -100
Edge dislocations whose tangent and Burger’s vector are not on a most closely packed plane are _________.
Fill in the blank(s) with the appropriate word(s).