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A proposed model study of a low-speed aircraft is to be performed using a 1:10 scale model. If the prototype is to travel at 25 m=s, what speed should be selected for a wind tunnel model? Is such a test advisable? Would it be better to test a 40:1 scale model in a water channel?
What phase difference among two otherwise identical travelling waves, moving in the similar direction along a stretched string, will result in the combined wave having amplitude 1.4 times that of the ordinary amplitude of the two combining waves? Exp..
According to Noether's theorem, all conservation laws originate from invariance of a system to shifts in a certain space. For example conservation of energy stems from invariance to time translation. What kind of symmetry creates the conservation of ..
two small spheres spaced 20.0 cm apart have equal charge. How many excess electrons must be present on each spere
A large container holding 340g of water, initially at 14°C is placed in a microwave oven. How much water is left in the container
A 123-kg care package with a parachute is dropped from an airplane and reaches a terminal speed of 5.00 m/s. What is the rate of work done by the air resistance
a ball is thrown vertically upward and then comes back down. describe the behavior of the balls velocity and
A microphone is located on the line connecting two speakers that are 0.514 m apart and oscillating 180° out of phase. What is the next highest frequency that produces an interference maximum at the microphone's location
A 70 ohm lamp and a 75 ohm lamp are connected in series and placed across a potential of 41 V. What is the voltage drop across the first lamp
A positive charge of 1.100? C is located in a uniform field of 9.00×104 N/C. How close are the two charges
Determine how many turns of wire would be required to make a 130-mH inductor out of a 29 centimeter long air-filled solenoid with a diameter of 5.1 centimeter
A circular coil (980 turns, radius = 0.043 m) is rotating in auniform magnetic field. At t = 0 s, the normal to the coilis perpendicular to the magnetic field. At t = 0.013 s,the normal makes an angle of 45o with the field becausethe coil has made ..
A thin circular disk of radius R rotates with angular speed w, about an axis through the centre of the disc and perpendicular to the plane of the disc.
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