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A 7.0 kg block hangs from a spring, extending it 22 cm from its unstretched position. What is the spring constant? The block is removed and a 1.1 kg body is hung from the same spring. If the spring is then stretched and released, what is its period of oscillation?
One proposed fusion reaction combines lithium 3Li6 (6.015 u) with deuterium 1H2 (2.014 u) to give helium 2He4 (4.003 u): 1H2 + 3Li6 ----> 22He4. How many kilograms of lithium would be needed to supply the energy needs of one household for a year, est..
The rms value of the electric field in an electromagnetic wave is Erms = 480 V/m. Find the average energy density
In the fusion of a deuterium nucleus (one proton, and one neutron) with a tritium nucleus (one proton, two netrons), the deuterium nucleus must have enough initial kinetic energy to overcome the repulsion force due to the electrostatic interaction..
A 9000pF capacitor holds plus and minus charges of 1.35×10?7C . What is the voltage across the capacitor
q1. the two rotating systems shown in the figure differ only in that two identical movable masses are positioned at
The coefficients of friction between a block of mass 1.0 kg and a surface are ?s = 0.75 and ?k = 0.40. What is the magnitude of the frictional force
A roller coaster cart with a mass of 116 kg is originally moving at 22 m/s at a height of 24 meters above the ground on a frictionless hill , What is the length of the horizontal surface
From 2 meters inside the water, a fish sees the Sun at an apparent angle of 60.0° above the horizontal. What is the actual elevation angle of the Sun
Two points are given in polar coordinates by (r,?) = (3.0 m , 35.0°) and (r,?) = (4.0 m, -35.0°), respectively. What is the distance between them
A 0.0500-kg lead bullet of volume 5.00 × 10?6 m3 at 20.0 °C hits a block that is made of an ideal thermal insulator and comes to rest at its center. How much heat was needed to raise the bullet to its final temperature
Robert has just bought a new model rocket, and is trying to measure its flight characteristics. how much work is done by the drag force on the rocket during its ascent
On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.590 from the axis of rotation of the stool. What is the initial angular momentum of the system
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