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A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 730-kg helicopter rises from rest to a speed of 8.8 m/s in a time of 3.9 s. Through this time it climbs to a height of 9.3 m. What is the average power generated with the lifting force?
Two cars of 2000 kg each collide head-on while traveling at 75.0 miles per hour. What is the temperature increase of the cars
A gamma-ray telescope intercepts a pulse of gamma radiation froma magnetar, a type of star with a spectacularly largemagnetic field. The pulse lasts 0.25 s and delivers 7.2 x10-6 J of energy perpendicularly to the94-m2 surface area of the telescope..
A small but measurable current of 7.4 x 10-10 A exists in a copper wire whose diameter is 2.9 mm, calculate the current density and electron drift speed
A small plane takes off and flies 12.0 kilometer in a direction south east of the airport. Find the magnitude of the plane resultant displacement from the airport
A screen is placed 1.20m behind a single slit. The central maximum in the resulting diffraction pattern on the screen is 1.40cm wide-that is, find the distance between the two second-order minima
A cannon is placed on the ground and angled 36.87 above thehorizon, to shoot a balloon wich is 500 meters away. At what time does the cannon pass under the ballon
Compute the Force of Friction (Ff) for a 5kg aluminium block being pulled with constant velocity (uniform motion), up the steel plank that is at a 30degrees angle to the horizontal.
A 2.10-cm-high insect is 1.50m from a 139-mm-focal-length lens. Where is the image? Follow the sign conventions, How high is the image
The 600-N ball shown is suspended on a string AB and rests againsta frictionless vertical wall. The string makes an angle of 30? with the wall. The ball presses against the wall with a force of magnitude:
a roller coaster car is at the top of a "loop-de-loop" and is at the point where it is upside down. Why is there no outward force on the car
A missile is aimed to hit a target 650 km away. If the missile is fired at an angle of 20o by the horizontal, what must be its launch speed so that it will hit the target? Once fired, how long does the missile take to hit the target?
Consider a line that is 1.4 m long. A moving object is somewhere along this line, but its position is not known. Find the minimum uncertainty in the object's velocity
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