A solar flare creates a radio disturbance on Earth a few minutes after going off and again several days later. Explain
What will be an ideal response?
A flare will give off intense X-rays and ultraviolet light, which travels to Earth in about 8 minutes. But also given off is an intense burst of high energy particles which travel to the Earth at speeds much less than the speed of light. They can take several days to reach the Earth. Both forms of radiation create radio disturbances when they reach the Earth.
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A 1-cm-thick, 1-m-square steel plate is exposed to sunlight and absorbs a solar flux of 800 W/m2. The bottom of the plate is insulated, the edges are maintained at 20°C by water-cooled clamps, and the exposed face is cooled by a convection coefficient of 10 W/(m2 K) to an ambient temperature of 10°C. The plate is polished to minimize reradiation. Determine the temperature distribution in the plate using a node spacing of 20 cm. The thermal conductivity of the steel is 40 W/(m K).
GIVEN
Square plate with water-cooled edges exposed to solar flux
FIND
(a) Temperature distribution in the plate
ASSUMPTIONS
(a) Neglect temperature gradients through the plate thickness
SKETCH
How might dark matter particles be discovered?
A) by probing the interactions they have with the human body. B) through looking with X-ray telescopes at the X-ray's they emit. C) by measuring the radiation that comes from Type Ia supernovae. D) through looking with infrared telescopes at the IR radiation they emit. E) through experiments like the Large Hadron Collider.
An electron a distance d from a proton feels an electrostatic force of magnitude 
. Imagine that we move the electron so that it is a distance 2d from a helium nucleus (which has two protons and two neutrons). The magnitude of the force on the electron now is b , where b is
A. 4 B. 2 C. 1 D. 1/2 E. 1/4
In a supermarket, you place a 22.3-N (around 5 lb) bag of oranges on a scale, and the scale starts to oscillate at 2.7 Hz. What is the spring constant of the spring of the scale?
A) 650 N/m B) 600 N/m C) 330 N/m D) 820 N/m E) 410 N/m