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An electric fan not only does not decrease the temperature of the air, but it really increases air temperature. How can you then explain that you are cooled by a fan on a hot day?
The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. Determine the skier launch speed
A sign (mass 1900 kg) hangs from the endof a vertical steel girder with a cross-sectional area of0.18 m2. (Ignore the mass ofthe girder itself.) What is the stress within the girder
A bridge 121.0 m long is constructed of steel having a coefficient of expansion of 11.1 × 10 -6 /K. If it is built as a single, continuous structure, by how many centimetres will its length change among the coldest days (-26.0°C) and the hottest summ..
The same activity is measured for two different isotope samples. One sample contains 0.0450 kg of (atomic mass = 230.033 937 u, t1/2 = 20.8 days). What is the mass of the second sample
A geothermal power plant is supplied with water at a well bottom temperature of 225 degrees C and a pressure of 8 MPa. The fluid flows into a flash separator maintained at 40 KPa. The turbine exit pressure is 10KPa.
Find what is a reasonable length of time for a normal person to run two meters, from a dead stop to full speed ahead
A man pushing a mop across a floor causes it to undergo two displacements. The first has a magnitude of 158 cm and makes an angle of 116° with the positive x axis. The resultant displacement has a magnitude of 131 cm and is directed at an angle of 32..
A loop of wirein the plane of the floor has a clockwise current of 7.78A. The radius of the loop is 19.7cm. Use the Biot SavartLaw to calculate the magnetic field at the center of the loop. What is the directionof the magnetic field at the center? Ex..
A diagnostic ultrasound echo is reflected from moving blood and returns with a frequency 314 Hz higher than its original 2.00 MHz. What is the velocity of the blood
A 65.0 kg base runner begins his slide into second base when he is moving at a speed of 4.5 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base.
The middle C string on a piano is under a tension of 744 N. The period and wavelength of a wave on this string are 3.82 10-3 s and 1.26 m, respectively. Find the linear density of the string.
Tarzan swings through the jungle by hanging from a vine. Immediately after he steps off the branch, Find the Tarzan acceleration is zero or nonzero
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