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A 1000kg ar accelerates from rest to 25.0m/s in 4.20 s.Ignoring frictional forces. what is the average power( inhorsepower) delivered by the engine?
A string is wrapped many times around a pulley and is connected to a block with mb = 5.711 kg that is hanging vertically. What is the magnitude of the acceleration of the block
A sledge loaded with bricks has a total mass of 17.8 kg and is pulled at constant speed by the rope inclined at 20.4° above the horizontal. The sledge moves a distance of 20.7 m on a horizontal surface. The coefficient of kinetic friction between ..
A 0.33 kg softball has a velocity of 19 m/s at an angle of 34° below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball
Change values of the initial position, initial velocity, and the acceleration of the car so that its center follows the same path as the dot. What is the equation that describes motion of the dot.
Two adjacent natural frequencies of an organ pipe are determined to be 986 Hz and 870 Hz. (Assume the speed of sound is 343 m/s.), Calculate the fundamental frequency of this pipe
A compound absorbs at 500 nm with a halfwidth of 500 cm-1 and maximum molar extinction of 4x10^4M-1 cm-1. What is the oscillator strength? What is the excited state rate of emission (A)?
When a dog is wet, it will often dry itself by twisting violently. Why does this cause the water to leave its fur
A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for40.0 min at 50.0 km/h, 7.0 min at70.0 km/h and 35.0 min at 30.0km/h, and spends 35.0 min eating lunchand buying gas.
A block of mass = 2.90 is attached to a string that is wrapped around the circumference of a wheel of radius = 7.20. The wheel rotates freely about its axis and the string wraps around its circumference without slipping. At first the wheel rotates..
An infinitely long line of charge has a linear charge density of 4.50×10?12C/m. How close does the proton get to the line of charge
An object with a mass of 4.0 Kg travels with a constant velocity of 8.5m/s northward. How far will the object travel before coming to rest
A laser produces a 3.10-mW beam of light, consisting of photons with a wavelength of 610.1 nm. (a) How many photons are emitted by the laser each second? photons/s (b) The laser beam strikes a black surface and is absorbed. What is the change in the ..
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