A Styrofoam cooler has a surface area of 2,700 cm2 and a wall thickness of 3.00 cm. Styrofoam has a coefficient of thermal conductivity of 0.010 W/m 
A 2.00 kg block of ice is placed inside the cooler that has a temperature inside of 2
When the temperature outside is 30.0
the ice lasts for 8.00 hours. If the temperature outside becomes 20.0
then how long will the ice last?
A. 20.3 hr
B. 18.5 hr
C. 12.4 hr
D. 10.1 hr
E. 8.5 hr
C. 12.4 hr
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Energy Levels: The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 122 nm B. 203 nm C. 243 nm D. 389 nm E. 411 nm
What is the angular speed of a point on the earth's surface at 60.0° north latitude? What is the linear speed of such a point?
What will be an ideal response?
I take two pictures of my dog Kaycee. I use the same film and level of illumination for both pictures, but I quadruple the f-number for the second picture. By what factor will the required time of exposure change if the film is to receive the same total light energy?
a. 0.06 b. 0.25 c. 4.0 d. 16.0 e. 3.0
A substance is allowed to diffuse along a 10-cm length of tubing filled with water. The cross section of the tube is 5.3 cm2 . If the diffusion coefficient is 5.0 × 10^¯10 m2/s, and 6.5 × 10^¯14 kg is transported along the tube in 16 s, what is the difference in the concentration levels of the substance at the two ends of the tube?
a. 3.9E–1 kg/m3 b. 4.3E–2 kg/m3 c. 1.5E–3 kg/m3 d. 8.1E–4 kg/m3