A beam of electrons is accelerated through a potential difference of 1.0 kV before entering a velocity selector. If the magnetic field of the velocity selector has a magnitude of 0.010 T,
what magnitude of the electric field is required if the electrons are not to be deflected as they pass through the velocity selector? ((e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg)
A) 5.9 × 103 V/m
B) 6.0 × 105 V/m
C) 7.2 × 106 V/m
D) 1.9 × 105 V/m
E) 1.1 × 105 V/m
D
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In the context of light curves, observations of an eclipsing binary system can directly tell astronomers not only the masses of its stars but also their _____
A) orbital periods B) diameters C) intensity of magnetic fields D) temperatures
The difference in temperatures between ice age and non-ice age climate is less than 20 °C
What will be an ideal response?
In a curing process for plastic and other polymer-based materials, a plastic sheet, which initially is 25°C, is placed on a hot metal surface that is maintained at 250°C. If the back (or opposite) side of the 5-mm-thick plastic film is considered to be insulated, how long does it take for the back side to reach temperature of 90°C. Assume the following plastic properties: c = 1450 J/(kg K), k= 0.23 W/(m K), and ?= 1975 kg/m3
GIVEN
• Initial temperature of plastic sheet (T0)= 250C
• Sheet thickness (2L) = 5 mm = 0.005 m
• Opposite side or back is insulated
• Metal surface temperature (T?)= 2500C
• The thermal conductivity of the plastic (k) = 0.23 W/(m K)
• Density(?) = 1975 kg/m3
• Specific heat capacity (c)= 1450 J/(kg K)
FIND
Time taken for backside to reach temperature of 900C
ASSUMPTIONS
• The initial temperature of the sheet is uniform
• The temperature of the steel plates is constant
• The thermal conductivity of the sheet is constant
SKETCH
A marble rolls off the edge of a table top with a speed of 2.0 m/s. What is the magnitude of its velocity 0.10 s later?
What will be an ideal response?