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A duct has an initial cross-sectional area of 0.58 m2. If the initial velocity of the air moving through the duct is 9.5 m/s, find what does the cross-sectional area have to be to increase the velocity to 15.0 m/s? Suppose a constant density of 1.1 kg/m^3.
An electron is released from rest at the negative plate of aparallel plate capacitor and accelerates to the positive plate. The plates are separated by a distance of 1.4 cm, and the electricfield within the capacitor has a magnitude of 2.2 x 106V/..
A positively charged object with a mass of 0.114 kg oscillates at the end of a spring, generatingELF (extremely low frequency) radio waves that have a wavelength of5.04 107 m.
The person;s gold wedding ring is stuck on his finger, and he must remove it. Find how much must the temperature of the ring be increased for it to slide past the knuckle
a bar of gold bar a is in thermal contact with a bar of iron bar b of the same length and area. one end of the compound
Traditional slingshots of old were made from camel hair and are, on average, about 80 cm in length. How long would it take to reach this speed
A wire in the shape of an equilateral triangle 13.6 cm on a side is placed in a uniform magnetic field of magnitude 0.136 T. If the field makes an angle of 71.8 ? With the plane of the triangle, decide the magnetic flux during the triangle.
A solid cylindrical disk is to be used as a stabilizer in a ship. By using a massive disk rotating in the hold of the ship, the captain knows that a large torque is required to tilt its angular momentum vector.
A certain piece of metal weighs 1.68 N in air and 0.82 N when submerged in water. What is the mass density of the metal (in g/cm3)
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 32.5 dB. What is the intensity delivered to the eardrum
Two people with a combined mass of 120kg hop into an old car with worn-out shock absorbers. This causes the springs to compress by 8.30 cm. When the car hits a bump in the road, it oscillates up and down with a period of 1.70s.
A coil has a DC resistance of 100 Ω and an impedance of 180 Ω at a frequency of 2 kHz. Neglect the wiring capacitance of the coil at this frequency. What is the inductance of the coil? Answer in units of mH.
A cluster of galaxies has a radius of about 5.2 million light-years (4.9×10^22) and an intracluster medium with a temperature of (6.5×10^7) K. Estimate the mass of the cluster. Give the answer in both kilograms and solar masses. Suppose combined l..
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