Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude and direction of the net force on the 5.0 nC charge?
What will be an ideal response?
5.4 × 10-6 N, 56° above -x-axis
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Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and cord have negligible mass and 
(2.0 kg) moves on a horizontal surface without friction, 
(2.0 kg) is suspended vertically. What is the acceleration of 
?
A. 3.9 
B. 12
C. 6.0
D. 4.9
A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest on Earth,
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket. B) the light will reach the front of the rocket before it reaches the back of the rocket. C) the light will reach the front of the rocket after it reaches the back of the rocket.
Another name for the Earth's crust is the
A) troposphere B) lithosphere C) asthenosphere D) mesosphere
The cooling efficiency of an average new heat pump (in Btu/(Wh)) is 8.70 . The most efficient unit has a cooling efficiency of 16.4 . A heat pump typically lasts 14 yr
How much more energy will the less efficient heat pump use over its lifetime? Describe the assumptions you must make to answer this question.