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A playground is on the flat roof of a city school, 6.1 m above the street below (see figure). The vertical wall of the building is h = 7.60 m high, forming a 1.5-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of ? = 53.0°; above the horizontal at a point d = 24.0 m from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall (a) Find the vertical distance by which the ball clears the wall.
A projectile is launched with an initial speed of40.0 m/s at an angle of 35.0° above the horizontal. What is the projectile's velocity at the highest point of its trajectory
Two identical wheels are moving on horizontal surfaces. The center of mass of each has the same linear speed. However, one wheel is rolling, What is the total kinetic energy of each wheel
Wildlife biologists fire 19g rubber bullets to stop a rhinoceros, charging at 0.83 m/s. The bullets strike the rhino and drop vertically to the ground. What impulse does each bullet deliver
water flows between two parallel plates separated by a distance of h. there is a pressure gradient along x which is constant, find the pressure gradient
Only two forces act on an object (mass=3.76 kg), as in the drawing. Find the direction (relative to the x axis) of the acceleration of the object
A student sits on a rotating stool holding two 3.6-kg objects. When his arms are extended horizontally, Find the new angular speed of the student
For the shear building shown, determine the natural frequencies (RAD/SEC) and the modal matrix. Also, sketch the deflected buildings in their normal modes using the top floor as the reference floor (set its displacement = unity). Finally, demonstr..
Astronauts use a centrifuge to simulate the acceleration of a rocket launch. How many g's of acceleration does the astronaut experience when the device is rotating at the top speed? Each 9.80 m/s2 of acceleration is 1 g
A potter's wheel having a radius 0.55m and a moment of inertia 12kg•m2 is rotating freely at 51 rev/min. The potter can stop the wheel in 7 s by pressing a wet rag against the rim and exerting a radially inward force of 67N. Find out the effectual co..
Find out the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the suitcase and the floor is 0.40.
At time t=0 a grinding wheel has an angular velocity of 22.0 rad/s. It has a constant angular acceleration of 32.0 rad/s^2 until a circuit breaker trips at time t = 2.00 s. What was the wheel's angular acceleration as it slowed down
An automobile with a mass of 2250 slugs is driven around a circular curve, What is the centripetal force on the car
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