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A helicopter, starting from rest, accelerates straight up from theroof of a hospital. The lifting force does work in raising the helicopter. An 810-kg helicopter rises from rest to a speedof 9.0 m/s in a time of 3.5s. During this time it climbs to a height of7.8m. What is the average power generated by the lifting force?
Define a spectrum and discuss how spectra are used in astronomy. Explain how emission and absorption lines are produced and discuss the information they convey. Describe how the spectrum of an object emitting thermal radiation can be used to find the..
while in a third floor office building you notice a ball moving straight upward just outside the window. it takes 0.17
Two capacitors, one 17.5 ?F and the other 12.2 ?F are connected in series across a 15 V battery. What is the charge stored on the 12.2 ?F capacitor
A hockey puck B rests on a smooth surface of ice and is struck by a second puck A , which was originally traveling at = 40.0, What fraction of the original kinetic energy of puck A dissipates during the collision
an object is launched with an initial velocity of 23.4 ms at an angle of 38.5 degrees above the horizontal. it lands on
A fire truck attaches two fire hoses to a hydrant to fight a fire. each hose has a diameter of 20 cm. How many kilograms of water are put on the fire in 30 minutes
A nonconducting spherical shell, with an inner radius of 7.4 cm and an outer radius of 9.9 cm, has charge spread nonuniformly through its volume between its inner and outer surfaces.
Cloverleaf exits are approximately circular. A 740 kg automobile is traveling 60 mph while taking a cloverleaf exit that has aradius of 44.5 m. Calculate the centripetal acceleration of the car and the centripetal force on the car
A 3kg object moving along the positive x direction with a speed of 10m/s exploeds into a 2kg and a 1kg fragments. what is the speed of the 2kg fragment?
A sound wave of frequency 1840 Hz., propagating through air at 0 degrees Celsius, has a pressure amplitude of 15.0 Pa. What is the maximum particle speed
A small postage stamp is placed in front of a concave mirror (radius = 1.3 m), such that the image distance equals the object distance. What is the magnification of the mirror
An ultrasonic transducer, of the type used in medical ultrasound imaging, is a very thin disk (m=0.10g ) driven back and forth in SHM at 1.0 MHz by an electromagnetic coil, What is the maximum oscillation amplitude that won't rupture the disk
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