An astronaut is in an all-metal chamber outside the space station when a solar storm results in the deposit of a large positive charge on the station. Which statement is correct?
a. The astronaut must abandon the chamber immediately to avoid being electrocuted.
b. The astronaut will be safe only if she is wearing a spacesuit made of non-conducting materials.
c. The astronaut does not need to worry: the charge will remain on the outside surface.
d. The astronaut must abandon the chamber if the electric field on the outside surface becomes greater than the breakdown field of air.
e. The astronaut must abandon the chamber immediately because the electric field inside the chamber is non-uniform.
c
You might also like to view...
We can apply the equation Ft = change in (mv) to the case of a baseball player striking a pitched ball. To impart the maximum change in momentum, mv, to the ball, the batter hits the ball with the greatest force he can muster and he also
1) extends the time of contact as much as possible by "following through." 2) makes the time of contact as short as possible, thereby increasing the force. 3) none of the above! In the impulse-momentum equation applied to hitting the ball, the "v" represents 4) the velocity of the bat. 5) the velocity of the ball. 6) a vector quantity.
A large number of 3.8 cm OD pipes carrying hot and cold liquids are embedded in concrete in an equilateral staggered arrangement with center line 11.2 cm apart as shown in the sketch. If the pipes in rows A and C are at 16°C while the pipes in rows B and D are at 66°C, determine the rate of heat transfer per foot length from pipe X in row B.
GIVEN
A large number of pipes embedded in concrete as shown below
Outside diameter of pipes (D) = 3.8 cm
The temperature of the pipes in rows A and C = 16°C
The temperature of the pipes in rows B and D = 66°C
FIND
The rate of hat transfer per foot length from pipe X in row B
ASSUMPTIONS
Steady state, two dimensional heat transfer
Uniform thermal conductivity in the concrete
SKETCH
Chromatic aberration can be corrected by combining two or more lenses to form a compound lens
Indicate whether the statement is true or false
Suppose an unpowered but moving railroad car receives some coal (basically at rest) from a stationary conveyor belt. This coal therefore only carries chemical energy into the car. This mass transfer will
A. Cause the car’s speed to increase. B. Cause the car’s speed to decrease. C. Have no effect on the car’s speed.