A cylindrical rod of 3 cm diameter has a surface temperature of 300ºC when in a free stream of engine oil at 80ºC moving at 12 m/s. Determine the heat transfer per unit length of the rod.
What will be an ideal response?
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A small airplane with a wing span of 12 m flies horizontally and due north at a speed of 60 m/s in a region where the magnetic field of the earth is 60 ?T directed 60° below the horizontal. What is the magnitude of the induced emf between the ends of the wing?
A. 50 mV B. 31 mV C. 37 mV D. 44 mV E. 22 mV
What is a beat in terms of the physics of sound?
a. The rhythm of a drummer. b. A repeated sound pulse through a vibrating system. c. The sound of a metronome used to help play the instrument at a steady pace. d. A periodic variation in volume caused by superimposing sounds of two similar frequencies. e. A single sound pulse through a vibrating system.
A 2.0-C charge moves with a velocity of (
m/s and experiences a magnetic force of 
N. The x component of the magnetic field is equal to zero. Determine the z component of the magnetic field.
A. ?3.0 T B. +3.0 T C. +5.0 T D. ?5.0 T E. +6.0 T
In the four radioactive series, the nuclei decay by either emitting alpha particles or beta particles until they reach the stable end product. Each decay, therefore, results in a mass number change of either 4 (for alpha decay) or 0 (for beta decay). The radium isotope 226Ra is in one of these series. What is the starting isotope in the series containing 226Ra?
a. 238U b. 235U c. 232Th d. 237Np