The walls of an ice chest are made of 2.00-mm-thick insulation having a thermal conductivity 0.00300 W/m?K. The total surface area of the ice chest is 1.20 m2
If 4.00 kg of ice at 0.00°C are placed in the chest and the temperature of the outside surface of the chest is 20.0°C, how long does it take the ice to melt under steady state conditions? The latent heat of fusion of water is 79.6 cal/g = 334 kJ/kg.
A) 4.22 h
B) 22.1 h
C) 17.6 h
D) 1.33 d
E) 10.3 h
E
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Velocity Addition: A rocket is traveling away from Earth at 90% the speed of light. The captain turns on a laser light. What is the speed of the light as measured by an Earth-based astronomer if the captain aims the laser (a) directly forward or (b) directly backward?
What will be an ideal response?
Compound Microscope: The objective lens of a microscope has a focal length of 2.4 mm and the eyepiece has an angular magnification of 15. The object is positioned 0.060 mm beyond the focal point of the objective. The focal point of the eyepiece is positioned at the real image formed by the objective. The near point of the microscope user is at 25 cm. What is the distance between the objective lens and the eyepiece?
A. 98 mm B. 102 mm C. 107 mm D. 111 mm E. 115 mm
An emf is induced in a wire by changing the current in that wire
Indicate whether the statement is true or false
A certain crystal has a spacing of 0.442 nm between atoms. A beam of neutrons moving with a speed of 1640 m/s perpendicular to the surface is diffracted as it passes through the crystal
What is the angle from the central maximum to the next interference maximum? (mneutron = 1.675 × 10-27 kg, h = 6.626 × 10-34 J ? s) A) 17.0° B) 21.0° C) 33.1° D) 60.0° E) 90.0°