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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.)
A crate with a weight of 50N rests on a horizontal surface. A person pulls horizontally on it with a force of 10N and it does not move. To start it moving, a second person pulls vertically upward on the crate. If the coefficient of static friction is..
You took a job as a space station scientist. On a spacewalk you get separated from the station. At what speed will you move back toward the station
a particles have charges q1 -q2 450 nc and q3 -q4 95 nc and distance a 5.8 cm. what are the a x and b y components
A small camera has a lens with focal length f=15 mm has a movable lens that can be focused on objects as close as 20 cm or as far away as infinity (relative to f). What is the optimum lens-film distance
A very long, straight wire carries a current of 16.3 A out of the screen. Find the magnitude of the force on the electron if it is moving upward
A cannon fires a cannonball from the top of a wall at a speed of 23.07 m/s and an angle of 19.56 degrees from the horizontal. What is the horizontal distance from the wall where the fired cannonball hits the ground
white light falls normally on a transmission grating with 1000 lines per centimeter. At what angle will yellow light (550nm) emerge
a circular loop of wire of cross-sectional area 0.12m2 consists of 200. turns each carrying 0.50a. it is placed in a
A piece of sandston with a bulk volume of 1.3 cc is contained ina 5-cc cell filled with helium at 760 mm Hg. Temperature is maintained constant and the cell is opened to another evacuated cell the same volume. The final pressure in the two vessels..
The scale of a spring balance reading from 0 to 230 N has a length of 15.0cm. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.40 Hz. What is the mass of the fish ignoring the mass of the spring.
Figure 13-46 shows four particles, each of mass 30.0 g, that form asquare with an edge length of d = 0.700 m.If d is reduced to 0.400 m, what is the change in the gravitational potential energy of the four-particle system?
Consider the circuit shown in the figure below, where C1 = 2.00 µF, C2 = 9.00 µF, and ?V = 18.0 V. Calculate the final charge on each capacitor
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