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Which two particles that make up atoms have about the same mass? Which two have the same magnitude of electric charge? What is an electric current, and what are its units? (Give two equivalent units.)
A 100-W lightbulb has a resistance of about 12Ω when cold (12 C) and 140Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature when hot assuming an average temperature coefficient of resistivity a =0.0060 ..
two concrete spans that form a bridge of total length l0 314 m when the temperature is t0 68of are placed end to end
A 50-kg diver steps off a 10-meter high platform at the local pool. She comes to rest 3.0 meters below the surface of the water
The graphite in a pencil has a resistivity of7.84×10−6 W×m.The graphite's diameter is 0.700 mm and its length is40.0 mm. (a) Find the resistance of this graphite "wire." (b)Find the diameter of a cylindrical copper wire of the same length(having resi..
A wildlife researcher is tracking a flock of geese. The geese fly 5.0km due west, then turn toward the north by 40degrees and fly another 5.0km. What is the magnitude of their displacement
What apparent free-fall acceleration is experienced by the managers remaining on the rim assume that the average mass for each inhabitant is 65kg.
Three point charges are arranged on a line. Charge q3 = +5.00nC and is at the origin. Charge q2 = -3.50nC and is at x = 3.50cm. Charge q1 is at x = 2.50cm. What is q1 (magnitude and sign) if the net force on q3 is zero?
A spider hangs from a strand of silk whose radius is 3.60 10-6 m. The density of the silk is 1300kg/m3. Determine the mass (in kg) of the spider
question 1two astronauts yuri and valentina are flying their rockets towards each other both at a speed of 09c as
A stick of mass M is held by supports at each end, with each support providing a force of Mg/2. PWhat forces do the three support now provide
What is the maximum possible angular momentum L (as a multiple of h) of a hydrogen atom with energy -0.544eV
An insulated beaker by negligible mass contains liquid water by a mass of 0.315kg and a temperature of 65.8C. How much ice at a temperature of -15.0C should be dropped into the water so that the final temperature of the system will be 28.0C?
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