A Sun-like star has a power output of 5.0·1026 W with 88.5% of this energy supplied by the proton-proton chain. How many protons are consumed per second in the core of this star?

Using the given charge-to-mass ratios for electrons and protons, and knowing the magnitudes of their charges are equal, what is the ratio of the proton's mass to the electron's? (The charge-to-mass ratios for electrons and protons are −1.7588×1011 C/kg and 9.5788e7 C/kg , respectively. Note that since the charge-to-mass ratios are given to five-digit accuracy, your answer may differ from the accepted ratio. Round your answer to at least five significant figures.)  Mp/Me =

Harnessing a small fraction of the Sun's energy could provide 3 x 1013 W of energy worldwide. How many days would be required (assuming constant 24-hr energy harnessed with zero efficiency loss) to fulfill the total world's energy needs of 4x1020J?

Name Date Class 3-4 Apply The Carbon-Nitrogen Cycle Hydrogen nuclei are involved in a process known as the carbon-nitrogen cycle. The six reactions in this decay series are presented below. The net result of the carbon-nitrogen cycle is that four hydrogen atoms are combined to produce one helium atom. Reactions 2 and 5 involve decay particles called positrons ( e ). Positrons are essentially positively charged beta particles. Reaction 1: H + "C → Reaction 2: + Reaction 3: H + → "N + y Reaction 4: H + - "0+ y Reaction 5: +e Reaction 6: H + "N - + He+y Use your knowledge of radioactive decay to fill in the missing parts of each nuclear equation above. Which type of radioactive particle was emitted by the following isotopes? a. N b. N In the cycle, what happens to the nitrogen-13 nuclei produced in the first reaction? What happens to the atom produced in the sixth reaction?

An lithium nucleus has a velocity of v = (4.76 x 106 m/s) i – (2.75 x 106 m/s) j and travels through a region of space with a uniform magnetic field of B = (0.667 T) k This particle has a charge of +3e = +4.806 x 10 19 C and seven nucleons in the nucleus meaning it has a mass of 7u = 7(1.66 x 1027 kg) = 11.6 x 10-27 kg (a) Find the magnetic force on this particle. (HINT: You can use the cross product or the magnitude and right-hand-rule. If you use the magnitude and RHR, be sure to calculate the magnitude and angle of the velocity first) (b) This force will provide a centripal force on the particle and cause it to circle (or orbit) around the field lines. What would be the radius of this circular path? (c) What is the period of the orbit?

The protons in a nucleus are approximately 2 x 10-15 m apart. Consider the case where the protons are a distance d = between two protons at this distance. N 2.02 x 10-15 m apart. Calculate the magnitude of the electric force (in N)

Consider an object of mass 52.2 kg. Assume that its made up of equal numbers of protons, neutrons, and electrons. How many protons does this object contain?       6.24E+28     7.80E+27     1.56E+28     3.12E+28

c) The equation below describes the disintegration of a polonium nucleus into a lead nucleus and an alpha-particle. During the reaction energy Q is released. 210Po → He +²02Pb+Q 84 82 Calculate the loss of energy during the reaction. The masses in the atomic mass unit u are as follows: 210 206 Po= 209.98287 u, Pb = 205.97446 u and He = 4.002604 u. 84 82 You may assume that 1u is equivalent to 931 MeV. d) The lead nucleus recoils in the opposite direction to the emitted alpha particle conserving momentum. Hence calculate: i) The ratio of the recoil nucleus and alpha particle velocities ii) The kinetic energy distribution of these products.

Consider an object of mass 22.2 kg. Assume that it s made up of equal numbers of protons, neutrons, and electrons. How many protons does this object contain?

The strong force between nucleons has a magnitude of approximately 2.5 × 104 N for two nucleons whose centers are 1.0 fm apart. What is the electrostatic force between two protons this distance apart? Compare the electrostatic force to the strong force.