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The heat and light radiated by stars is the result of fusion, the process in which energy is released when hydrogen nuclei (protons) smash into each other to form helium. Fusion is not easy to achieve since the protons' like charges means that there is a huge electric repulsion between them when they are at the small distances (on the order of 1 fm) required to form a nucleus. To see why fusion only occurs at very high temperatures (like at the center of stars), consider this basic problem: Two protons are initially very far apart from each. What minimum speed must one of the protons be launched in order for it to overcome the electric repulsion and to end up within 1 fm of the other? (For simplicity, assume the other proton is being held in place.)
Two rectangular pieces of plane glass are laid one upon the other on a table. find the angle of the wedge
What is the total force on an object if 47.2 pounds upward, and 59.3 lb to the right are acting on it? answer sketching the diagram and show mathematical calculation.
A 0.5kg block is attached to a spring with spring constant 18 N/m. As the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 34cm/s.
q. a solid nonconducting sphere of radius r has a positive charge q distributed uniformly throughout its volume. since
A 10 kilogram block is placed on an ideal vertical spring that has been compressed 20 centimeter from its equilibrium length. Find the speed of the block as it leaves the spring
A block of iron at 43.0°C has mass 2.30 kg. If 3.50×104 J of heat are transferred to the block, what is its resulting temperature
A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Determine the work done by the gas on the bullet
A discus thrower exerts a torque of 6 Nm on a 2.25 kg discus at an angular velocity of 6.3 rad/sec. The discus has a radius of gyration of 0.10 m. Assume that no other torque or force is acting on the discus than what is provided in this scenario...
The Hoover Dam is 220 meters high and the pressure at the bottom of the dam is 2.2 million Pascals. What is the pressure at 55 meters from the surface in million Pascals
a 1.00 kg object is attached to a horizontal spring. the spring is initially stretched by 0.500 m and the object is
A potential difference of 76 mV exists between the inner and outer surfaces of a cell membrane. The innersurface is negative relative to the outer surface. How much work is required to reject a positive sodium ion (Na+) from the interior of the ce..
Estimate the molar heat of vaporization of a liquid whose vaporpressure doubles when the temperature is raised from 85C to95C
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