Can two different forces, acting through the same point, produce the same torque on an object?
What will be an ideal response?
Yes, as long as the component of the force perpendicular to the line joining the axis to the force is the same for both forces.
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Newton concluded that a force from the Earth had to act on the Moon because
a. a force is needed to keep the Moon in motion in its orbit. b. a force is needed to pull the Moon outward. c. a force is needed to accelerate the Moon toward Earth away from straight-line motion. d. the Moon moved at a constant velocity in a straight line. e. All of the other choices are correct.
Which of these are effects of the Doppler shift?
A. When an object accelerates, the wavelengths of its light get warmer. B. When an object is moving toward us, the wavelengths of its light decrease. C. When an object slows, the wavelengths of its light get cooler. D. When an object is moving away from us, the frequencies of its light increases.
What is the thermal resistance of a 10 m^2 insulation board, 30 cm thick, and having thermal conductivity of 0.03 W/m?K?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. Equation E18.4 
is also solved by a function f (s), where s = t + x/c.
2. One can in principle create a purely electric traveling electromagnetic wave in empty space 