A 4-kg object falls vertically a distance of 5 m. Its potential energy has changed by approximately how much?
a. It has increased by 20 J.
b. It has decreased by 200 J.
c. It has decreased by 20 J.
d. It has increased by 200 J.
b
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If electrons are stripped from an atom it becomes a
A) positive ion. B) negative ion. C) different element. D) molecule.
The rate of seafloor spreading can be calculated by
A) the magnetic pattern generated at the ocean floor. B) knowing the dates for magnetic pole reversals, and the distance from the location of a known reversal site to the ocean ridge. C) looking at the magnetic tape recording of the ocean floor. D) the rate of seafloor spreading cannot be calculated.
What is the steady state rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a thickness of 4.00 mm when the outside temperature of the glass is -10.0°C and its inside temperature is 25.0°C?
The thermal conductivity of glass is 0.105 W/(m?K), the specific heat of glass is 0.180 cal/(g?°C), and 1 cal = 4.190 J. A) 3.81 W B) 110 W C) 24.2 W D) 47.3 W E) 18.6 W
Three charged particles are positioned in the xy plane: a 50-nC charge at y = 6 m on the y axis, a ?80-nC charge at x = ?4 m on the x axis, and a 70-nc charge at y = ?6 m on the y axis. What is the electric potential (relative to a zero at infinity) at the point x = 8 m on the x axis?
a. +81 V b. +48 V c. +5.8 V d. ?72 V e. ?18 V