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A duck is swimming down a river and passes a slow moving log. If the duck is moving 2.50 times faster than the log, but the log has 3.75 times the kinetic energy of the duck, what is the ratio of the log\'s mass to the duck\'s mass?
A freezer has a coefficient of performance of 6.30. It is advertised as using 446 kWh/yr. how much energy does it use in a single day
A block of unknown mass is attached to a spring of spring constant 6.1 N/m and undergoes simple harmonic motion with an amplitude of 9.5 cm. Calculate the mass of the block
an electric power line carries a current of 1400 a in a location where the earths magnetic field is 6.0 ? 10-5 t. the
It is found that a uniform amount of electrical flux is going through each region of a Gaussian surface shaped like a cube. What amount of charge is there inside the sphere
A certain string just breaks while it is under 25 N of tension. A boy uses this string to whirl a 0.75-kg stone in a horizontal circle of radius 2.00 m. The boy continuously increases the speed of the stone. At around what speed would the string b..
You want to estimate the height of the Empire State Building. You start at its base and walk 15 m away. Then you approximate the angle from the ground at that point to the top to be 88 degrees. How tall do you estimate the Empire State Building to..
1. a ship has a top speed of 3.0 ms in calm water. the current of the ocean tends to push the boat at 2.0 ms on a
A pilot flies an airplane at a constant speed of 520 km/hr in the vertical circle of radius 1400 m. compute the force exerted by the seat on the 105-kg pilot at point A and at point B.
A 56-kg student runs at 4.2m/s , grabs a hanging 10.0-m-long rope, and swings out over a lake. He releases the rope when his velocity is zero. What is the angle when he releases the rope
When a 50.0-V emf device is placed across two resistors in series, a current of 12.0 A is flowing in each of the resistors. What is the magnitude of the larger of the two resistances
Illustrate what is the intensity of the beam transmitted through the three sheets when 1 = 19.0°, 2 = 51.0° and 3 = 100.0° ?
When an electron in a hydrogen atom falls from a higher energy state down to the ground state, What is the quantum number of the level from which the electron fell
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