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A 60 cm long steel rod with a diameter of 4 cm is mated to a 40 cm long Cu rod with the same diameter. the unmated end of the steel rod( not at the interface) is connected to a 140 degrees C heat source, while the far end of the Cu( not at the interface) is connected to a 20 degrees C heat source. when the rod reaches a steady state, what is the temperature at the steel Cu surface and heat rate through the rod.
q1. the pulley system is used to lift a 52 kg crate. note that one chain connects the upper pulley to the ceiling and a
Potential energy curves are a useful tool for making sense of nuclear processes such as alpha-decay, fission, and fusion. The potential energy curve for each different type of nucleus is different and depends on the number of protons and neutrons.
A water pipe decreases in diameter from 16 cm to 8 cm. In the wider section the average velocity is 30.0cm/s. calculate the average velocity in the narrow section
suppose we measure the resistance from one hand to the other and find it to be 2 kilo ohms. What is the resistivity of skin
A member of an aircraft maintenance crew wears protective earplugsthat reduce the sound intensity by a factor of 380. When a jetaircraft is taking off, the sound intensity level experienced bythe crew member is 84 dB.
The monthly (30 days) electric bill included the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbs for 5.0 hr/day. How much did these items contribute to the cost of the monthly ..
In 1965 Penzias and Wilson discovered the cosmic microwave radiation left over from the Big Bang expansion of the universe. Determine the corresponding electric field amplitude
The low range of frequencies used for medical applications is about 1,000,000 Hz. What is the wavelength of this frequency in air
a girl is riding her bicycle . when she gets to a corner, she stops to get a drink from her water bottle. how long does it take for her to catch up with her friend
q1. what do superstring theories try to elucidate?a. forces holding super clusters of galaxies togetherb. behaviour of
A current travels northwards along a power line, in the downwards magnetic field of the earth. In which direction will the magnetic force on the wire be directed
q1. sound waves of frequency 502 hz enter a window 1.18 m wide. the window is in the exact center of one wall of a
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