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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.
A cable is lifting a construction worker and a crate, asthe drawing shows. The weights of the worker and crate are915 and 1500 N, respectively. What is the tension in the cable below the worker
βAn observer that is standing 12m from a stereo sound speaker perceives the sound level from the speaker to be 60 dβ. What is the decrease in the physical intensity in watts/m2
When a proton (+1.6 x 10^-19 C) moves .10 m along the direction of an electric field of strength 3.0 N/C, what is the magnitude of the electrical potential difference between the protons initial and ending points
300g of water at 30 c if each gram gains 3.7 calories of heat, what i the final temperature, how much heat gained by the system
a 7 ohm resistor is mounted in parallel with a resistor r5 ohms and this combination is connected in series with an 8
A 5-kg fish swimming 1 m/s swallows an absentminded 1-kg fish swimming toward it at a speed that brings both fish to a halt immediately after lunch. What was the speed of the smaller fish
Two long parallel wires are separated by 3.89 mm. The current flowing in one of the wires (wire 1) is twice that in the other wire (wire 2). If the magnitude of the force on a 1.37 m length of one of the wires is 6.13 ?N, what is the value of the cur..
a typical co2 laser produces infrared radiation in the range of 9000-11000 nm wavelength in pulses of 5 j and 500 ns
In a certain particle accelerator a 5MeV beam of protons with a current of 0.5mA and beam radius of 1.5mm is shot at a target. How many protons hit the target in one second
A 22.5 cm screwdriver is used to pry open a can of paint. If the axis of rotation is 2.29 cm from the end of the screwdriver blade and a force of 79 N is exerted at the end of the screwdriver’s handle, what force is applied to the lid? Answer in unit..
A satellite is placed in orbit 7.2 x 105 mabove the surface of Jupiter. Jupiter has a mass of 1.90 1027 kgand a radius of 7.14 x 107 m. Find the orbital speed of the satellite
A machine shop grinding wheel accelerates from rest with a constant angular acceleration of 2.5rad/s^2 for 6.9s, Find the total number of revolutions turned
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