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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 proton, an electron, and an alpha particle (of charge +2e) form an equilateral triangle of side length 2.19×10-10 m. What is the electric potential energy of the three-particle system
Two wires are identical, except that one is gold (resistivity = 2.44×10-8 ?·m) and the other is NiChrome (resistivity = 1.10×10-6 ?·m). What is the resistance of the NiChrome wire
a uniform 12.0kg ladder is 4.0m long and is placed against a frictionless wall at 30 degress. find the frictionless force at the floor necessary to maintaain equilibrium
An electromagnetic wave has an electric field given by E (y,t)=[ 3.85 x 105 V/m cos(ky-(1.160 x 1013 rad/s )t)]khat. Determine what is the wavelength of the wave
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in whichh = 2πJ · s. What is the minimum uncertainty in the duck's speed
A research group plans to construct an engine that extracts energy from the ocean, using the fact that the water temperature near the surface is greater than the temperature in deep water. what is the maximum efficiency such an engine could have
Calculate the force required to hold a long bow with the string pulled back just before releasing the arrow
a runner of mass m=37kg and running 2.8 m/s runs and jumps on the rim of a playground merry go round which has a moment of inertia of 383 kg.m2 and a radius of 2 meters. what is its final angular velocity
a 2.0kg block of wood rests on a long tabletop. A 5.0 g bullet moving horizontally with a speed of 150 m/s is shot into the block and sticks in it. Find the speed of the block just after impact
When point charges q1 = +2.4 µC and q2 = +1.3 µC are brought near each other, each experiences a repulsive force of magnitude 0.39 N. Determine the distance between the charges.
An ideal gas is kept in a container of constant volume. Thepressure of the gas is also kept constant. The number of moleculesin the gas is halved. what is the final rms speed
An electron moving parallel to the x axis has an initial speed of 3.70x10^6 m/s at the origin. Calculate the potential difference between the origin and that point.
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