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True or False?
1. Current density is a measure of the amount of current flowing through a volume.
2. The conventional direction of current is the hypotheticaldirection of movement of positive charges through the wires of anelectric circuit.
3. Through a certain cross-sectional area of a wire, one coulomb ofelectrons pass each second. In this case, the current through thewire is equal to one ampere.
4. A 10-ohm resistor has a constant current. If 1200 C of chargeflow through it in 4 minutes, the value of the current is 5A.
5. Current density is a measure of the amount of current through across-sectional area.
A freezer is used to freeze 2.0 L of water completely into ice. The water andthe freezer remain at a constant temperature of T =0°C. Determine the change in the entropy of the freezer
What is the pitcher's power output during the pitch and How much work does the pitcher do on the ball
In the quark model of fundamental particles, a proton is composed of three quarks: two "up" quarks, each having charge +2e/3, and one "down" quark, having charge -e/3. Suppose that the three quarks are equidistant from one another. Take the distance ..
A volume of 7.2 m3 of glycerol (η = 0.934 Pa. s) is pumped through a 15 m length of pipe in 55minutes. The pressure at the input end of the pipe is 8.6 x105 Pa, and the pressure at the output end isatmospheric pressure. What is the pipe's radius?
question a straight line ab with slope passes through the point of intersection of two other straight lines whose
Make a 10 to12 slide powerpoint presentation on behaviourism and social-learning theory. Include speaker notes and graphics, limit text to fie lines, and use approximately five words per bulleted item.
A rod of 2.0-m length and a square (2.0 mm × 2.0 mm) cross section is made of a material with a resistivity of 6.0 × 10-8 ? ? m. at what rate is heat generated in the rod
An investigator collects a sample of a radioactive isotope with an activity of 4.4×105Bq . 72hourslater, the activity is 1.2×105Bq. What is the half-life of the sample
A baseball (m = 138 g) approaches a bat horizontally at a speed of 38.6 m/s (86 mi/h) and is hit straight back at a speed of 45.5 m/s (102 mi/h). what is the average force exerted on the ball by the bat
A 350kg piano slides 3.7m down a 33^\circ incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (see the figure(Figure 1) ). The effective coefficient of kinetic friction is 0.32.
Halley's comet, which passes around the Sun every 76 years, hasan elliptical orbit. When closest to the Sun (perihelion) it is ata distance of 8.823 x 1010 m, Calculate its speed at aphelion
the position of a 50 g oscillating mass is given by xt 2.0 cm cos5t where t is in seconds. determine the following. a
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