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Two identical resistors are connected in parallel across a 27-Vbattery, which supplies them with a total power of 6.5 W. While thebattery is still connected, one of the resistors is heated so thatits resistance doubles. The resistance of the other resistor remains unchanged. Find (a) the initial resistanceof each resistor, and (b) the total powerdelivered to the resistors after one resistor has been heated.
The lower block in is pulled on by a rope with a tension force of F = 31 N.The coefficient of kinetic friction between the lower block and thesurface is 0.40. The coefficient of kinetic friction between the lower block and the upper block is also ..
the hot-air balloon shown below is tethered with three mooring cables. the force tb in cable db has a magnitude of 2230
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that theearth is a uniform sphere and that its path around the sun is circular.
Two masses are connected as in the figure, where ?=40.0°, m1=13 kg and the coefficient of kinetic friction between the m2=7 kg object and the plane is ?k=0.25. Find the acceleration reached by the objects
two toy locomotives approach each other along the same line and upon collision both stop dead still. one locomotive has
question one hundred stones are placed on the ground 3 ft. apart the first being 3 feet from a basket. if the basket
If the tension in a guitar string is increased by 20%, by what percentage does the wave speed increase? Harmonic waves are produced by a source that isoscillating in SHM. Which one of the following statements is correct concerning harmonic waves?
an especially violent lightning bolt has an average current of 2.86 x 103 a lasting 0.220 s. how much charge is
A recording engineer works in a soundproofed room that is 39.4 dB quieter than the outside. what is the intensity outside
Two charges q = +8.0 µC are fixed a distance d = 9.0 cm apart. You bring a third charge q = +8.0 µC from infinity to C. How much work must you do
A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 81.0 m/s at ground level. What is its maximum altitude
A rectangular loop of wire hangs vertically as shown in the figure. A magnetic field is di- rected horizontally, perpendicular to the wire, and points out of the page at all points as rep- resented by the symbol ?.
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