A Sun-like star will experience a helium flash in the core if
a. it is less massive than about 3 solar masses.
b. it has become a red giant star.
c. it has formed a helium core.
d. the material in the core has gradually become degenerate.
e. All of the other choices are correct.
e
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Air at 14.7 psia and 85ºF enters a square 1 ft x 1 ft heating duct. If the duct is 80 ft long and has an inside surface temperature of 65ºF, determine (a) hydraulic diameter, (b) convective heat transfer coefficient, and (c) air temperature leaving the duct.
What will be an ideal response?
How do we know that there are large gaps in the average distances of asteroids from the Sun (within the asteroid belt)?
A) We can see the gaps through telescopes. B) We can identify the gaps by looking for stellar occultations in which an asteroid passed in front of a star as seen from Earth. C) We have not actually detected any gaps, but theory says they must exist. D) We know the gaps must be present to explain how our spacecraft have successfully navigated the asteroid belt without suffering collisions. E) We notice gaps on graphs showing the distribution of asteroids with different orbital periods.
When a change occurs in the magnetic field in a closed loop of wire
A) a voltage is induced in the wire. B) a current is created in the loop of wire. C) electromagnetic induction occurs. D) all of the above E) none of the above
Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
A. it is passing car A. B. it has the same linear (tangential) acceleration as car A. C. it has the same centripetal acceleration as car A. D. it has the same total acceleration as car A. E. it has traveled farther than car A since starting.