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An airport has runways only 161 m long. A small plane must reach a ground speed of 40 m/s before it can become airborne. What average acceleration must the plane's engines provide if it is to take off safely from its airport?
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Suppose the convention were adopted that defines W and W 0 in the first law of thermodynamics to be the "work done on the system by the surroundings." a. Write the first law with this alternate convention. b. Why do the ...
At a playground, a toddler climbs on his bike starts to pedal away from his dad as fast as he can, at 12.6 km/h, towards a busy road that is 74.2 m away. At Δt=3.44 seconds later, his dad glances up from his phone and no ...
Question: In short-track speed skating, the track has straight sections and semicircles 16 m in diameter. Assume that a 64kg \;kg skater goes around the turn at a constant 11m/s Part A: What is the horizontal force on th ...
Question: A proton and an alpha particle are momentarily at rest at a distance r from each other. They then begin to move apart. Find the speed of the proton by the time the distance between the proton and the alpha part ...
Question: A rocket is launched straight up from the earth's surface at a speed of 1.80×104 m/s. What is its speed when it is very far away from the earth? The response must be typed, single spaced, must be in times new r ...
Question: Storm clouds build up large negative charges, as described in the chapter. The charges dwell in charge centers, regions of concentrated charge. Suppose a cloud has -25 C in a 1.0-km-diameter spherical charge ce ...
A soccer player kicks the ball that travels a distance of 45.0 m on a level field. The ball leaves his foot at an initial speed of (v0) and an angle of 25.0° above the ground. Find the initial speed (v0) of the ball.
Question: Suppose the distance from the lens system of the eye (cornea +lens) to the retina is 13 mm. (a) What must the power of the lens be whenlooking at distant objects? D (b) What must the power of the lens be when l ...
Question: Part A: What is the speed of light in ethyl alcohol (n = 1.36)? Part B: What is the speed of light in lucite (n = 1.50)? Part C: What is the speed of light in crown glass (n = 1.52)? The response must be typed, ...
Question: A steel cable with mass is lifting a girder. The girder is speeding up. Part A Draw a free-body diagram for the steel cable. Draw the vectors starting at the black dots. The location and orientation of the vect ...
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