Microwave radiation is useful in which of the following?
a. sending phone messages
b. cooking food
c. aircraft navigation
d. All of the above are valid choices.
d
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_________strengthening is when small hard particles are added to a ductile metal.
Fill in the blank(s) with the appropriate word(s).
What do we mean when we say that the Sun is in energy balance?
A) The amount of energy released by fusion in the Sun's core equals the amount of energy radiated from the Sun's surface into space. B) The Sun maintains a steady rate of energy output into space. C) The inward force of gravity balances the outward push of pressure. D) The amount of energy contained in the Sun's magnetic field is in balance with the amount of energy going into solar activity such as sunspots and solar flares.
One possible ingredient of dark matter is known as WIMPs, or weakly interacting massive particles. WIMPs probably are made of protons and neutrons
Indicate whether the statement is true or false
An electron is placed in a constant electric field of 4.5 × 104 N/C
(a) What is the force on the electron? (b) If the electron is released from rest, what is its speed after 3.0 ps?