Electrons orbit the atomic nucleus in just the same way that planets orbit the Sun.
Answer the following statement true (T) or false (F)
False
You might also like to view...
An electric room heater has been designed in the shape of a vertical cylinder 2-m-tall and 30 cm in diameter. For safety, the heater surface cannot exceed 35°C. If the room air is 20°C, find the power rating of the heater in watts.
GIVEN
• An electric heater in the shape of a vertical cylinder
• Heater height (H) = 2 m
• Heater diameter (D) = 30 cm = 0.3 m
• Room air temperature (T?) = 20°C = 293 K
FIND
• The power rating of the heater (q) in watts
ASSUMPTIONS
• Radiation is negligible
• Heat transfer from the top and bottom of the tank is negligible
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 27.5°C
Thermal expansion coefficient (?) = 0.00332 1/K
Thermal conductivity (k) = 0.0256 W/(m K)
Kinematic viscosity (?) = 16.4 × 10–6 m2/s
Prandtl number (Pr) = 0.71
Projectile Motion: A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown, assuming negligible air resistance?
A. 6.1 m/s B. 7.4 m/s C. 8.1 m/s D. 8.9 m/s
In general, the more massive the star, the ________ its lifetime
Fill in the blank(s) with correct word
The most underlying feature of machines is
A) energy conservation. B) that energy input always equals energy output. C) that power input always equals power output. D) all of the above E) none of the above