Two solenoids are nested coaxially such that their magnetic fields point in opposite directions. treat the solenoids as ideal. the outer one has a radius of 20 mm, and the radius of the inner solenoid is 10 mm. the length, number of turns, and current of the outer solenoid are, respectively, 20.5 cm, 545 turns, and 4.53 a. for the inner solenoid the corresponding quantities are 18.9 cm, 331 turns, and 1.49 a. at what speed, v1,should a proton be travelling, inside the apparatus and perpendicular to the magnetic field, if it is to orbit the axis of the solenoids at a radius of 5.69 mm? v1 =/s and at what speed, v2, for an orbital radius of 16.9 mm? v2 =/s

How many milliliters of water at 23 °c with a density of 1.00 g/ml must be mixed with 180 ml (about 6 oz) of coffee at 95 °c so that the resulting combination will have a temperature of 60 °c? assume that coffee and water have the same density and the same specific heat. how much will the temperature of a cup (180 g) of coffee at 95 °c be reduced when a 45 g silver spoon (specific heat 0.24 j/g °c) at 25 °c is placed in the coffee and the two are allowed to reach the same temperature? assume that the coffee has the same density and specific heat as water. a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of coffee at 85 °c and the temperature of the two become equal. (a) what is the final temperature when the two become equal? assume that coffee has the same specific heat as water. (b) the first time a student solved this problem she got an answer of 88 °c. explain why this is clearly an incorrect answer.