When the voltage across a resistor is decreased by 50%, what happens to the power dissipated?
A. it increases by 50%
B. it decreases by 50%
C. it decreases by 25%
D. it decreases by 71%
E. it decreases by 75%
E. it decreases by 75%
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What factors contribute to improving the stability of an object?
A. None these improve stability B. Lower center of gravity alone C. Wider base alone D. Wider base and lower center of gravity
Bands in Uranus' atmosphere, similar to those seen on the other jovian planets,
A) form due to Uranus' rapid rotation. B) do not exist due to Uranus' large axial tilt. C) do not exist because Uranus is too small. D) are formed by interactions with Uranus' moons and rings. E) are driven by Uranus' internal energy source.
A beaker of negligible heat capacity contains 456 g of ice at -25.0°C. A lab technician begins to supply thermal energy through the process of heating to the container at the rate of 1000 J/min
How long after starting will the ice begin to melt, assuming all of the ice has the same temperature? The specific heat of ice is 2090 J/kg ? K and the latent heat of fusion of water is 33.5 × 104 J/kg.
The electron density in copper is 8.49 × 10^28 electrons/m3 . The electron charge is e = -1.60 × 10^-19 C. When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is
a. -1.84 × 10^-6. b. +1.84 × 10^-6. c. -1.84. d. -5.43 × 10^5. e. +5.43 × 10^5.