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Two planes approach each other head-on. Each has a speed of 790km/h , and they spot each other when they are initially 12.4km apart.
How much time do the pilots have to take evasive action?
The intensity of the sound wave from a jet airplane as it is taking off is 86 W/m2 at a distance of 3.3 m. What is the intensity of the sound wave that reaches the ears of a person standing at a distance of 120 m from the runway
A company uses a process cost accounting system and the weighted average method for inventory costs. Calculate the equivalent units of production for direct labour for the year.
A carousel is initially at rest. At t=0 it is given a constant angular acceleration a=0.060 rad/s2, which increases its angular velocity for 8.0s. determine the angular velocity of the corousel
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. How long is each rod
A projectile of mass 2.06 kg approaches a stationary target body at 7.70 m/s. What is the speed of the target body
What is the density of Kripton gas at standard temperature and pressure? The atomic mass of Kripton is 83.80 atomic mass unit
The headlights of a pickup truck are 1.33 m apart. What is the greatest distance at which these headlights can be resolved
A copper rod has a length of 1.4 m and a cross-sectional area of 3.8 10-4 m2. One end of the rod is in contact with boiling water and the other with a mixture of ice and water. What is the mass of ice per second that melts
A 62 kg woman cheats on her diet and eats a 637 Calorie (637 kcal) jelly donut for breakfast. How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut
in a single-slit diffraction experiment, a beam of monochromatic light of wavelength 630 nm is incident on a slit of width 0.4 mm. what is the width of the central bright fringe
A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +25.0 rad/s. Then, the brakes are applied. In coming to rest, What is the angular acceleration of each wheel
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
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