Which of these objects is moving with constant velocity but changing acceleration?
a. a rock dropped from a bridge
b. a car going around a banked curve at 40 m/s
c. an aircraft being launched off of an aircraft carrier
d. an aircraft in a banked turn at 100 m/s
b, d
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The power rating of a 400-? resistor is 0.800 W. (a) What is the maximum voltage that can be applied across this resistor without damaging it? (b) What is the maximum current this resistor can draw without damaging it?
What will be an ideal response?
Convection in the outer layers of a star like the Sun helps mixing and makes more hydrogen available for burning.
Answer the following statement true (T) or false (F)
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80. g,
what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?
Three charges are placed as follows along the x- and y-axis of an xy-coordinate system: q1 = 2.00 ?C at x1 = 0 m, q2 = -4.00 ?C at x2 = 3.00 m, and q3 = 6.00 ?C at y = 4.00 m. What is the electric potential energy of this system of charges?
A) -40.2 mJ B) 40.2 mJ C) -94.2 mJ D) 94.2 mJ E) 0 J