A microscope has an objective lens of focal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective. How far apart are the lenses?
A) 20 mm
B) 21 mm
C) 23 mm
D) 33 mm
E) 41 mm
E
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Calorimetry: Two experimental runs are performed to determine the calorimetric properties of an alcohol which has a melting point of -10.0° C. In the first run, a 200-g cube of frozen alcohol, at the melting point, is added to 300 g of water at 20.0°C in a styrofoam container. When thermal equilibrium is reached, the alcohol-water solution is at a temperature of 5.0°C. In the second run, an identical cube of alcohol is added to 500 g of water at 20.0°C and the temperature at thermal equilibrium is 10.0°C. The specific heat capacity of water is 4190 J/kg ? K. Assume no heat is exchanged with the styrofoam container and the surroundings. What is the heat of fusion of the alcohol?
A. 5.5 × 104 J/kg B. 6.3 × 104 J/kg C. 7.1 × 104 J/kg D. 7.9 × 104 J/kg E. 8.7 × 104 J/kg
The Kuiper Belt is found where in the solar system?
A) among the orbits of the terrestrial planets B) beyond the orbit of Neptune C) between the orbits of Mars and Jupiter D) between the orbits of Jupiter and Uranus E) sixty degrees ahead of or behind Jupiter
A windowpane is half a centimeter thick and has an area of 1.10 m2 . The temperature difference between the inside and outside surfaces of the pane is 19.0 °C. What is the rate of heat flow through this window? (Thermal conductivity for glass is 0.840 J/s/m/°C.)
a. 7 020 J/s b. 3 510 J/s c. 4 180 J/s d. 1 850 J/s e. 2 200 J/s
Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
a. their changes in momentum. b. the force each exerts on the other. c. their changes in kinetic energy. d. all of the above. e. only (a) and (b) above.