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Listen to whales' songs and explain the effects of sound waves in the air and water by bringing examples with formulae. Discuss the possible changes of whales' songs as a result of temperature, wave speeds, and etc. How could you distinguish the whales' songs from other songs?
A 390 ohm resistor and a 6.10uF capacitor are connected in parallel to an ac generator that supplies an rms voltage of 220V at an angular frequency of 360rad/s.
A pipe filled with natural gas [methane (CH4)] is punctured by a line of small holes 1.00 cm apart down its entire 2.2-m length. What frequency is being played in this picture
A box stands against the wall of a cylinder that is rotating. The cylinder has a radius of 30cm. What is the minimum consant speed (magnitude of linear velocity) the box must move so it doesn't slip
A large air conditioner has a resistance of 8.0?and an inductive reactance of 14. Find the average power consumed by the air conditioner
A sledge loaded with bricks has a total mass of 17.2 kg and is pulled at constant speed by a rope inclined at 20.3° above the horizontal. What is the mechanical energy lost due to friction
Suppose a 76 kg person hangs vertically from a nylon rope. What radius must the rope have if its fractional enhancement in length is to be the similar as that of the spider's thread.
What will be the total horizontal distance traveled by the ball? What is the velocity of the ball (magnitude and direction) the instant before it hits the ground? That is what is its i-component? What is its j-component?
On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.650m from the axis of rotation of the stool. What is the initial angular momentum of the system
The Achilles tendon inserts on the calcaneus at a distance of 8cm from the axis of the ankle joint. The force generated by the muscles attached to the Achilles tendon is 3000N, and the moment arm of this force is 5cm. a) Draw a free body diagram o..
a block having mass m= 10kg rests on a horizontal surface. Us+.4 and Uk=.2. what is the friction force if an external horizontal force of 32N is exerted on the block
A copper wire with a cross sectional area of 3.00 mm^2 and a length of 2.00 m at 20.0 degrees C is connected to a 25.0 V battery, what is the resistance at 20.0 degrees C
An airplane has a mass of 1.8×10^6 kg , and the air flows past the lower surface of the wings at 94 m/s .f the wings have a surface area of 1300 m^2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the ai..
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