A measurement of an electron's speed is 2.0 × 106 m/s and has an uncertainty of 10%. What is the minimum uncertainty in position?
A)
0.29 nm
B)
0.58 nm
C)
0.87 nm
D)
1.2 nm
E)
1.6 nm
B
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The heat loss from the hairdryer duct enclosure was neglected. To a designer, while this may appear to be reasonable assumption it should really be checked bu order of magnitude calculations even if all the parameters are not known. In order to determine whether the heat loss from the exterior of the duct enclosure is neglected or not, assume a high surface emissivity of 0.8, an average surface temperature of 400C, and consider an estimate for natural convection coefficient at a high reasonable value. If the length of hair dryer is 20 cm, calculate the expected heat loss per unit length of the dryer duct, compare it with heat dissipation per unit length from the internal electrical heating, and comment on validity of negligible heat loss assumption.
GIVEN - High surface emissivity of 0.8, an average surface temperature of 400C - Length of the hear drier L=20 cm =0.2 m FIND - Expected heat loss per unit length of dryer duct - Compare it with heat dissipation per unit length from the internal electrical heating. ASSUMPTIONS - Steady state conditions prevail - Heat loss from outside of dryer duct is neglected. PROPERTIES AND CONSTANTS the air properties are Convection heat transfer coefficient for air (considering higher value) (hc)=20 W/(m2 K) Specific heat capacity(Cp)= 1.0049 kJ/kgK
There are more atoms in a glass of water than stars in the observable universe
Indicate whether the statement is true or false
Gas, lava, and ______________ are the three general products emitted during a volcanic eruption
Fill in the blank(s) with correct word
A rock that weighs 100 lb on Earth is taken to the Moon. Which of the following statements accurately describes what would be observed?
A. The rock is easier to lift because its weight is less on the moon B. The rock is more difficult to lift because the Moon's radius is less than Earth's C. The rock is just as difficult to lift on the Moon as it is on Earth because its mass hasn't changed D. The rock is easier to lift because its mass is less on the moon