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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An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,
(a) what voltage is present in the secondary? (b) what current is present in the secondary?
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 
?
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
When water vapor condenses to liquid water, is thermal energy absorbed or released?
What will be an ideal response?