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A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.8 m and ? = 18°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction between the sled runners and the snow is 0.20. If the sled moves up the hill with a constant velocity, how much work is done by the father in moving it from the bottom to the top of the hill?
Two identical, small insulating balls are suspended by separate 0.35-m threads that are attached to a common point on the ceiling, Determine the tension in the threads
A small piece of dust of mass m = 1.0 µg travels through an electric air cleaner in which the electric field is 500 N/C, What is the charge on the dust particle
Calculate the magnetic fields due to the displacement current midway between the plates at a radius equal to half the plate radius
A banana has 0.45 g of potassium. 0.0117% of that potassium is 4019K, What is the activity of the banana
The Bohr model of an atom assumes that electrons orbit the nucleus, in a manner similar to how planets orbit a sun. What is the orbital period of the electron
A boy of mass 49.4 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.3 m/s. Find the final velocity of the skateboard
It is observed that 59.6 mL of water at 18.6°C completely fills a container to the brim. What is the coefficient of volume expansion of the container
Two identical traveling waves, moving in the same direction, are out of phase by ?/4.0 rad. What is the amplitude of the resultant wave in terms of the common amplitude ym of the two combining waves
The electric field midway between two equal but opposite point charges is 730 N/C, What is the magnitude of the charge on each
The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. What is the magnitude of the average force on the car
A speedboat starts from rest and accelerates at +2.32 m/s2 for 6.78 s. At the end of this time, the boat continues for the additional 5.34 s with an acceleration of +0.677 m/s2. Following this, the boat accelerates at -0.686 m/s2 for 8.68 s.
A thick, vertical iron pipe has an inner diameter of 0.077 m. A thin aluminum (? = 23x10-6 (C°)-1) disk, What is the temperature of the aluminum disk when the disk falls into the pipe
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