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A fire helicopter carries a 620-kg bucket of water at the end of a 20.0-m-long cable. Flying back from a fire at a constant speed of 40.0 m/s, the cable makes an angle of 40.0 degrees with respect to the vertical. Determine the force exerted by air resistance on the bucket.
An object 2.5 cm tall is placed 23.2 cm from the front of a concave mirror with a radius of curvature of 33.1 cm. How tall is it
a projectile is fired horizontally from a gun that is 55.0 m above flat ground emerging from the gun with a speed of
A river 101.8 m wide flows toward the south at 31.0 m/min. A girl on the west bank wishes to reach the east bank in the least possible time. What is her velocity relative to land
A microscope has an objective lens with a focal length of 14.0mm . A small object is placed 0.90mm beyond the focal point of the objective lens. At what distance from the objective lens does a real image of the object form
Certain insects, such as the water bug, are sufficiently lightweight that they can run on top of water without breaking the surface tension. What is the weight of bug B
q1. a metal sphere has a charge of 8.9x10-6c. what is the net charge after 8.8 x 1013 electrons have been located on
car batteries are typically rated in ampere-hours or a middot h.a show that ampere-hours are actually a unit of
When a potential difference of 12V is applied to a wire 7.1m long and 0.34mm in diameter the result is an electric current of 2.2A. What is the resistivity of the wire
A glass window 0.35cm thick measures 84cm by 84cm. how much heat flows through this window per minute if the inside and outside temperture difference differ by 15 degree Celceus
A cryogenic storage container holds liquid helium, which boils at 4.2 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.40 m2 and is at 3.3 102 K.
A merry-go-round is a common piece of playground equipment. A 3.0-m-diameter merry-go-round with a mass of 230kg is spinning at 17rpm, What is the merry-go-round's angular velocity, in rpm, after John jumps on
How long does it take for the grinding wheel to stop ? Through how many radians has the wheel turned during the interval found in.
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