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The total mass of the Sun is about 2 ×1030 kg, of which about 75% was hydrogen when the Sun formed. Only about 11% of this hydrogen ever becomes available for fusion in the core (the rest is in the layers of the Sun where the temperature is too low for fusion). a. Calculate the total mass Astrof hydrogen available for fusion over the lifetime of the Sunb. The Sun radiates 4 × 1026 joules per second (= watts). How much of the Sun's hydrogen (in kg) is converted to energy each second? How long will the Suns initial supply of available hydrogen last, in years? (c=3 ×108 m/sec, and 1 year = 3.16 ×107 seconds).c. Given that our Solar System is now about 4.6 billion years old, when will we need to worry about the Sun running out of hydrogen for fusion?
illustrate what is the new horizontal distance L between the base of the slide and the splashdown point of the person?
For the third circuit, consisting of a single battery and two light bulbs in parallel, how does the brightness of the bulbs compare to the first circuit, What is the current through each bulb
Calculate the buoyant force on a 2.10-L helium balloon at sea level
assume all temperatures to be exact and neglect significant figures for small changes in dimension.an ideal gas in a
q1. for safety in climbing a mountaineer uses a nylon rope that is 69 m long and 1.0 cm in diameter. whilst supporting
Three silver wires of equal length are connected in series with a1.50 V battery. Their cross-sectional areas are 1.00, 5.00 and10.0 cm2. (a) What is the potential difference across the narrowest wire? (b) The medium wire? (c) The widest wire?
The waves from a radio station can reach a home receiver by two paths. One is a straight-line path from transmitter to home, a distance of 22.0 km. Find the minimum height of the ionospheric layer
A rolling ball moves from x1 = 8.7 cm to x2 = -4.0 cm during the time from t1 = 3.1 s to t2 = 6.5 s. What is its average velocity
A moving particle encounters an external electric field that decreases its kinetic energy from 10270 eV to 7400 eVas the particle moves from position A to positionB. The electric potential at A is -52.0 V, and the electric potential at Bis +27.7 V..
1 a rigid rotorwith moment of inertia ihas energy levelsnbspej jj 1macrh22i nbspwhere j 0 12 . . .andthere are 2j 1
A coin placed 29.0 cm from the center of a rotating, horizontal turntable slips when its speed is 50.2 cm/s, What is the coefficient of static friction between coin and turntable
An electron has an initial velocity of 4.9 × 106 m/s in a uniform 1.9 × 105 N/C strength electric field, What is the direction of the electric field
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