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Problem: The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film be increased or decreased to change the focus from a person who is 25 m from the lens to one who is 4.0 m from the lens?
I don't know how to work the above problem. Please show step by step solution. THANKS!
A rectangular loop (area=0.15m2) turns in a uniform magnetic field with B=0.20T. what is the magnitude of the emf induced in the loop
An electron moves in a uniform, horizontal 2.10-T magnetic field that is toward the west. Evaluate what is the direction of the minimal velocity
Some extreme sport enthusiasts have been know to jump off the top of El Capitan, It is very important that the parachute be far away from the cliff when opened. How far is the jumper from the cliff when opening the parachute
An insulated Thermos contains 150cm3 of hot coffee at 83°C. You put a 12g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as although..
Calculate the size of the smallest object on Mars that this telescope can resolve. Assume Mars is at its closest distance 7.8 × 1010 m from the Earth
You are designing an underwater maintenance schedule for anoffshore oil rig. The divers work at a depth of 15 m and theseawater density is 1027 kg m^-3 . They are known to consume 130litres of air at the ambient temperature is 10 o C over the timetak..
A person's prescription for her new bifocal glasses calls for a refractive power of -0.461 diopters in the distance-vision part, & a power of +1.83 diopters in the close-vision part. Compute the near & far points of this person's uncorrected visio..
A point charge of 8.40 mC is surrounded by an equipotential surface with a radius of 0.262 m. What is the electric potential on the surface
A pair of speakers separated by 0.700m are driven by the same oscillator at a frequency if 690Hz. an observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers.
Two shuffleboard disks of equal mass, one orange and the other yellow, are involved in an elastic, glancing collision. Determine the final speed of each disk
A projectile is launched at 45.0 degrees with the horizontal. Its initial speed is 250. m/s. what is the speed and direction of the object when it lands
Discuss the applications of MR fluids
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