The position of a particle moving along the x axis is given by x = (21 + 22t - 6.0t2)m, where t is in s. What is the average velocity during the time interval t = 1.0 s to t = 3.0 s?
a. -6.0 m/s
b. -4.0 m/s
c. -2.0 m/s
d. -8.0 m/s
e. 8.0 m/s
C
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A fire fighter tightens the nut on the top of a fire hydrant using a large wrench. If she applies a force of 250N perpendicular to the wrench, at a point 0.75m from the axis of rotation of the nut, how much work does she do on the nut as she rotates it through 
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A. 190 J B. 150 J C. 290 J D. 130 J
Two single charged ions moving perpendicularly to a uniform magnetic field (B = 0.40 T) with speeds of 5 000 km/s follow circular paths that differ in diameter by 5.0 cm. What is the difference in the mass of these two ions?
a. 2.6 × 10^?28 kg b. 6.4 × 10^?28 kg c. 3.2 × 10^?28 kg d. 5.1 × 10^?28 kg e. 1.1 × 10^?28 kg
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(a) what voltage is present in the secondary? (b) what current is present in the secondary?
When water vapor condenses to liquid water, is thermal energy absorbed or released?
What will be an ideal response?