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A cube of side 15 cm floats at the surface between waterand oil. The oil has a density of 810 kg/m3. If the cube floats sothat it is 52% in water and 48 % in the oil, what is the mass ofthe cube and what is the buoyant force on the cube.
A steel wire in a piano has a length of 0.60- m and a mass of 4.5 x10-3 kg. To what tension must this wire be stretched in order that the fundamental vibration correspond to middle C (fC = 261.6 Hz on the chromatic musical scale).
A future geosynchronous space station will be used to collect solar energy. The energy is transmitted back to earth as an electromagnetic beam. how large are the station's solar panels, assume 100% efficiency
a hypodermic needle consists of a plunger of circular cross-section that slides inside a hollow cylindrical syringe.
An electric current of 1 A flows through a 20 ? resistor which is kept at a constant temperature of 10° C by flowing water. In 1 s what is the entropy change of the resistor and the entropy change of the water?
A spring stretches by 0.0241 m when a 4.15-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f = 4.44 Hz
A model car is propelled by a cylinder of carbon dioxide gas. The cylinder emits gas at a rate of 4.5 grams/second with an exit speed of 80.0 m/s. what is the car's initial acceleration
A 663 kg elevator starts from rest it moves upward 2.7s with aconstant acceleration until it reaches its cruising speed of 1.63m/s, What is the power during an upward cruise with constant speed
your car is traveling behind a jeep. both are moving at the same speed so the velocity of the jeep relative to you is
Four equal masses M are spaced at equal intervals, l, along ahorizontal straight rod whose mass can be ignored. find the momentof inirtia of the system about this axis
a capacitor with a capacitive reactance of is connected in series with a 100 resistor across in ac source of frequency 60.0hz. what is the phase angle
A sample of gas (? = 1.5) is taken through an adiabatic process in which the volume is compressed form 1600 cc to 400 cc. If the initial pressure is 150 KPa, what is the final pressure? How much work is completed on the gas in process.
A very long, straight solenoid with a cross-sectional area of 2.30cm2 is wound with 93.4turns of wire per centimeter. What is the magnitude of the emf induced in the secondary winding at the instant that the current in the solenoid is 3.2
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