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Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 4735 kg), which is made of steel (? = 7810 kg/m3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-pong balls. A ping-pong ball has a mass of 2.70 g and a volume of 3.35·10-5 m3.
a) What is the buoyant force on one ping-pong ball in water?
b) How many balls are required to float the ship?
It takes a minimum distance of 48.96 m to stop a car moving at 12.0 m/s by applying the brakes (without locking the wheels). find the minimum stopping distance
A computer disk is 8.0 cm in diameter. A reference dot on the edge of the disk is initially located at theta=45 degrees. The disk accelerates steadily for 0.50 s, reaching 2000 rpm, after those coasts at steady angular velocity for another 0.50 s.
A system has a heat source supplying heat at a rate of 187 W and is doing work at a rate of 130.899998 W. At what rate is the internal energy of the system changing.
A solid disk of radius 1.60 m and mass 2.3 kg rolls without slipping to the bottom of an inclined plane. what is the height of the inclined plane
An electron starts from rest 43.1cm from a fixed point charge with -0.150nC. How fast will the electron be moving when it is very far away
When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.39 m. Compute the horizontal distance the ball would travel if the same spring were aimed 28.0 deg from the horizontal.
As you zip through space in your PPS (personal propulsion suit), your pulse rate, as you count it, is 121 bpm, How fast are you moving with respect to the Moon
A block of mass 0.6 kg is moving up a 40 degree inclined plane at a speed of 2 m/s. how far up the plane will the block go before stopping
A uniform rod of mass 3.05×10^-2?2kg and length 0.370m rotates in a horizontal plane about a fixed axis through its center, compute the angular speed of the rod after the rings leave it
Four 1.8 kg masses are located at the corners of a square 0.20 m on each side. Find out the magnitude and direction of the gravitational force on a fifth 1.8 kg mass placed at the midpoint of the bottom side of the square.
A second converging lens of focal lenght 12 cm is placed to the right of the first lens. If the final image of the combined lens system is virtual and 15 cm from the second lens, then compute the distance between the two lenses
Rumor has it that a photographic camera on a spy satellite can read the license plate of an automobile on the ground. what must be the diameter of the aperture of the camera
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