An electron is moving with speed 21. m/s
(a) What is its deBroglie wavelength?
(b) What Diffraction Grating spacing between slits would give a 1st order maximum at 30.0°?
(a) 35. ?m
(b) 69. ?m
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A 1500 W portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home that is made of a single pane of glass 0.30 cm thick. Thermal conductivity for the glass is 0.63 W/mK. The temperature inside the house is 
and outside is 
What is the thickness of the window?
A. 0.84 mm B. 4.2 mm C. 2.6 mm D. 0.66 mm
Faraday's Law: A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil and it steadily changing. Under these circumstances, an emf ? is induced in the coil. If the rate of change of the magnetic field and the number of turns in the coil are now doubled (but nothing else changes), what will be the induced emf in the coil?
A. 2? B. ?/2 C. 4? D. ?/4 E. ?
A person is walking outdoors on a cold day when the temperature is -20°C. Each time he breathes, he inhales 0.0050 m3 of air
He is breathing at the rate of 16 breaths per minute. At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37°C) before it is exhaled? The specific heat of air is 1020 J/(kg?K) and the density of air is 1.29 kg/m3. A) 60 W B) 90 W C) 100 W D) 150 W E) 300 W
Uniform motion is any motion at constant speed
a. True b. False Indicate whether the statement is true or false