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A ball is thrown upward from the top of a 23.1-m-tall building. The ball's initial speed is 11.1 m/s. At the same instant, a person is running on the ground at a distance of 28.0 m from the building. What must be the average speed of the person if he is to catch the ball at the bottom of the building?
A spherical object has an outside diameter of 50.0 . Its outer shell is composed of aluminum and is 1.80 thick. The remainder is uniform plastic with a density of 810. Determine the object's average density.
a 15mw energy laser has a beam exit diameter of 2cm and beam divergence of 0.0002radians.anbspnbspcalculate the power
A child is playing by jumping on a bathroom scale. The mass of the child is 31 kg and when he stands on a bathroom scale, the spring inside the scale compresses 0.46 mm. what is the maximum height the child can jump on the scale
A horizontal board weighing 232.0 Nis supported at points A and B in the figure below. The plankserves as a platform for a painter, who weighs 571.0 N. Find the maximum distance D, suchthat the plank will not tip, no matter where the painter stands.(..
Calculate the rotational inertia of a meter stick, with mass 0.83 kg, about an axis perpendicular to the stick and located at the 44 cm mark
A 3.7 L volume of ideal neon gas (monatomic) is at a pressure of 2.9 atmospheres and a temperature of 330 K. The number of neon atoms in the gas is closest to
The magnetic field inside a 5cm diameter solenoid is 2.0T and decreasing at 4.0 T/s. What is the electric field strength inside the solenoid
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 128-kg laser sensor that measures the thickness of the ice, find the tension in the cable towing the sensor
A modern sculpture has a large horizontal spring, with a spring constant of 274 N/m, By how much has the spring stretched
A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 5.0. Calculate the intial kinetic energy of the system
display that Gauss' law is satisfied for the magnetic field due to a straight wire that carries a current I in the +z - direction for a volume that represents a portion of a cylindrical shell of height h, extending from a radius r to a radius R a..
A wheel (mass = 7.54 kg, radius = 16.8 cm) rolls, without slipping, down the side of a hill. How much energy does the wheel lose to friction
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