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A 3.00-kg object is fastened to a light spring, with the intervening cord passing over a pulley. The pulley is frictionless, and its inertia may be neglected. The object is released from rest when the spring is unstretched. (a) If the object drops 15.0 cm before stopping, find the spring constant of the spring. N/m (b) If the object drops 15.0 cm before stopping, find the speed of the object when it is 5.10 cm below its starting point. m/s
A block of unknown mass, m, is brought into the configuration shown. It was measured that upon release the block shot upward a maximum distance of 2m. Calculate the mass of this block? The upper spring has a natural length of 1m, and the lower spr..
A stone is dropped into a river from a bridge at a height h above the water. Another stone is thrown vertically down at a time t after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second sto..
A 10 capacitor initially charged to 30 is discharged through a 1.2 resistor. How long does it take to reduce the capacitor's charge to 7.
For a procedure, the enthalpy change and the entropy change of the system is 173000 J and its entropy change is 210 J/K. compute the free energy change of the system at 298 K.
The length of a string is 456 cm. It is held ?xed at each end. The string vibrates in three sections; i.e., the string has three antinodes and string vibrates at 180 Hz.
A polar bear of mass 436 kg stands on an ice floe 58.10 cm thick. What is the minimum area of floe that will just support the bear in saltwater of density of 1030 kg/m3? The specific gravity of ice is 0.88.
Let us use the uncertainty principle to (very roughly) estimate the size of a hydro- gen atom. Picture the hydrogen atom as an electron orbiting a proton at close to the speed of light.
An object at rest explodes into three pieces of equal masses. One moves east at 23 m/s, while the second piece moves northwest at 14 m/s. Estimate the velocity of the third piece? Suppose each piece has a mass of 2 kg.
What is an acceleration of two falling sky divers (mass 120.0 kg including parachute) while the upward force of air resistance is equal to one-fourth of their weight.
What is constant acceleration
An electron is at rest just above the surface of a sphere with the radius of 1.90 mm and a uniformly distributed positive charge of 2.1 x10-15 C.
A long wire lying along the x-axis carries a current of 1.60 A in the +x direction. There is the uniform magnetic field present, given by B=0.003i + 0.004j + 0.002k, where i, j, k are the unit vectors along cartesian coordinate axes') in units of Tes..
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