Two point charges are placed along a horizontal axis with the following values and positions: +3.8 µC at x = 0 cm and ?7.6 µC at x = 20 cm. At what point along the x axis is the electric field zero?

a. 10 cm
b. 8 cm
c. –5 cm
d. –48 cm
e. –68 cm


d

Physics & Space Science

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Estimate the time required to heat the center of a 1.5-kg roast in a 163°C oven to 77°C. State your assumptions carefully and compare your results with cooking instructions in a standard cookbook.

GIVEN

FIND
The time required to heat the roast
ASSUMPTIONS

SKETCH

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Hydrocarbons with the general formula CnH2n+2 are called ______________

Fill in the blank(s) with correct word

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The wavelength of the hydrogen line from level 1 to level 2 in a hot star is ____________ the wavelength of the same line in a cool star. The stars have the same radial velocities away from Earth

a. larger than b. the same as c. smaller than d. not enough information to answer

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When discussing stellar lives, astronomers divide stars by mass into low-mass stars (masses similar to the Sun or lower) and high-mass stars (masses more than about 8 times that of our Sun). Which category includes stars that die in supernova explosions?

A) high-mass stars only B) low-mass stars only C) They both die in supernova explosions. D) Neither: Supernovas only occur in binary star systems.

Physics & Space Science