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A 26.2-kg dog is running northward at 3.05m/s, while a 5.30-kg cat is running eastward at 3.53 m/s. Their 69.3-kg ownerhas the same momentum as the two pets taken together. Find the direction and magnitude of the owner's velocity.
How long does it take the projectile to reach the top of its trajectory? Explain how high does the projectile go before it begins to fall?
Old naval ships fired 13 kg cannon balls from a 210 kg cannon. It was very important to stop the recoil of the cannon, since otherwise the heavy cannon would go careening across the deck of the ship.
A parallel-plate capacitor is made by placing polyethylene ( =2.3) between two sheets of aluminum foil. The area of eachsheet of aluminum foil is 410 cm2, and the thickness ofthe polyethylene is 0.5 mm.
Change values of the initial position, initial velocity, and the acceleration of the car so that its center follows the same path as the dot. What is the equation that describes motion of the dot.
the weight of a star is usually balanced by two forces the gravitational force acting inward and the force created by
The parallel metal plate of a capacitor is detached by a distance of 0.5cm and is connected to a 90v battery. Find the electric field between them and surface charge density on the plate.
Jason has a 45-power telescope whose objective lens has a focal length of 120 {\rm cm}. What is the angular magnification of his sister when viewed through the "wrong" end of the telescope
A stone is projected at a cliff H=60 meters with initial speed 75m/s at 60degrees above the horizontal. How long does it take for the stone to strike the top of the cliff?
The syringe must be heated to high temperatures to sterilize it. When the syringe is at its maximum temperature, the number of oxygen molecules is 6.5 x 1019, what is the rms speed of the oxygen molecules
An energetic father stands at the summit of a conical hill as he spins his 23kg child around on a 6.0kg cart with a 2.1m--long rope. The sides of the hill are inclined at 25kg . He keeps the rope parallel to the ground, and friction is negligible. Wh..
A glass U-tube with a uniform diameter of 0.850 cm is used to determine the density of an oil. Calculate the density of the oil
An inclined plane is sliding, and accelerating, on a horizontal frictionless surface. What is minimum acceleration of the inclined plane for the square block not to slide
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