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Through a thunderstorm, winds with a speed of 47.0 m/s blow across a flat roof with an area of 785 m2.
a) Is the force exerted on the roof in the upward or downward direction?
b) Discover the magnitude of the force exerted on the roof as a result of this wind.
a 900 hz sound wave is produced on the source side of the tube shown in the figure. the sound travels to the right
In a physics demonstration the teacher whirled a bucket filled with water at the end of a rope in a circular path. If the rope breaks, determine what path will the bucket follow and why
An object is placed 50 cm in front of a convex mirror and its image is found to be 20 cm behind the mirror. What is the lateral magnification
Suppose that you find the volume of all the oceans to be 1.4\times10^9\; \rm km^3 in a reference book. What is this volume in cubic meters
A converging (lens f=+12cm) in contact with a diverging lens gives a combined focal length of +36 cm, calculate the focal length of the diverging lens
The height of a tower is measured with attaching a simple pendulum to its ceiling, whose length is barely enough to stay off the floor. The pendulum is let go from a small angle, and takes12 s to return to the similar location it started from.
A fighter pilot dives his plane toward the ground at 230 m/s.He pulls out of the dive on a vertical circle. What is the minimun radius of the circle
a 0.145-kg baseball pitched at 37.0 ms is hit on a horizontal line drive straight back toward the pitcher at 50.5 ms .
an electron moves through an electric field and its speed drops from 2800 ms to 1900 ms. whats the potential difference
An electron has a velocity of 6.0 x 10^6 m/s in the positive x direction at a point where the magnetic field has the components Bx=3.0T, What is the magnitude of the acceleration at this point
A 500g rock on a 80 cm long string is swung in a vertical circle 300 cm above the ground. What is the speed of the ball at this point
A skier of mass 73 kg is pulled up a slope by a motor-driven cable, What power (expressed in hp) must a motor have to perform this task
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