List the seven base quantities in the SI system
What will be an ideal response?
length, mass, time, electric current, temperature, amount of substance, luminous intensity
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The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant. B. its speed is increasing. C. its speed is decreasing. D. its speed is a maximum. E. its speed is a minimum.
A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 × 10-7 Pa. If the volume of the chamber is 0.500 m3 and the temperature is 27°C, how many molecules are left inside the chamber? (NA = 6.022 × 1023 molecules/mol, R = 8
31 J/mol ? K) A) 1.2 × 1013 B) 2.4 × 1013 C) 1.2 × 1012 D) 2.4 × 1012 E) 1.2 × 1014
Radiation darkening explains why
A) there are so many dark craters on the jovian moons. B) Uranus' moons are darker than Saturn's. C) Earth's Moon is made of rock, but jovian moons are icy. D) Iapetus has a two-faced appearance.
A system consisting of a positively-charged particle and an electric field
A. loses potential difference and kinetic energy when the charged particle moves in the direction of the field. B. loses electric potential energy when the charged particle moves in the direction of the field. C. loses kinetic energy when the charged particle moves in the direction of the field. D. gains electric potential energy when the charged particle moves in the direction of the field. E. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.