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A child slides down a snow-covered slope on a sled. At the top of the hill, her mother gives her a push at a speed of 0.9 m/s to obtain her started. The frictional force acting on the sled is one-fifth of the combined weight of the child and the sled. If she travels for a distance of 22.5 m and her speed at the bottom is 3.9 m/s, compute the angle that the hill makes with the horizontal.
A mass of 20g is attached to a spring, and undergoes simple harmonic motion with a period of T=0.7 s. The total energy of the system is E=2.5 mJ. What is the force constant of the spring? What is the amplitude of the motion?
As morning sunlight falls on a tethered helium balloon, it expands from a volume of 1.05 ×103 m3 to 1.15 ×103 m3. how many joules of solar energy are absorbed
A 0.123-kg ball is dropped from a height of 1.19 m and lands on a light (approximately massless) cup mounted on top of a light, What is the required spring constant of the spring
a superball of mass 50 g is dropped from a height of 10 cm. since it is a superball assume that it rebounds from the
What will be the equilibrium temperature when a 223 g block of copper at 258 C is placed in the 178 g aluminium calorimeter cup containing 874 g of water at 13.2 C.
4.71 mol of neon gas is initially at a pressure of 4.23 atm and a temperature of 282oC. If the gas is cooled at constant pressure, until the volume is one third of the initial volume, what is the final temperature
Before throwing a 0.905kg discus, an athlete rotates it along acircular path of radius 1.15m. The maximum speed of the discus is23 m/s. Determine the magnitude of its maximum radial acceleration.
a piece of thin spherical shell that has a radius of curvature of 94 cm is silvered on both sides. the concave side of
An ideal 0.15-H inductor and a capacitor are connected in series with an ideal 60-Hz generator. Find the capacitance and the rms current in the circuit
A rope is wrapped around a wheel of diameter, 50cm. The wheelis mounted with a frictionless bearing on an axle through itscenter. What is the linear acceleration of the falling block
A person pushes on a stationary 125 N} box with 69N at 30degrees below the horizontal, as shown in the figure. The coefficient of static friction between the box and the horizontal floor is 1.20. What is the normal force on the box?
a small sphere with a radius r 1.52cm and a mass m 13.8g rolls without slipping on the inside of a large fixed
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