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As a solar type star is running out of nuclear fuel for the final time, it casts off its outer layers into an expanding cloud of gas surrounding the star's collapsing core. Briefly, the cloud of gas forms a glowing nebula around the hot core. This nebula is called...
a) A supernova remnant
b) A planetary nebula
c) A Bok globule
d) A asymptotic giant nebula (AGN)
A pump is used to empty a 4800 L. wading pool. The water exits the 3.0-cm-diameter hose at a speed of 2.0 m/s
An 11 centimeter long solenoid of diameter 0.415 centimeter is wound uniformly with 750 turns. Find the mutual inductance of combination of the two coils
A 130gram meter stick is perpendicular to a rough verticalwall because of a 2.0meter string attached to the wall and the farend of the stick. What force does string exert on stick
a bullet is fired through a wooden board with a thickness of 11.0 cm. the bullet hits the board perpendicular to it and
An electron that has an energy of approximately 23 eV moves between rigid walls 1.8 nm apart. Find the precise energy of the electron
A lump of clay of mass 0.30 kg is thrown straight at a brick wall with a speed of 22 m/s. What is the average force on the wall (in N) during this collision
A coil withan inductance of 2.7 H and aresistance of 10 is suddenlyconnected to an ideal battery with = 85 V. What is the rate at which energy is being delivered by the battery
A golfer hits a shot to a green that is elevated 3.0 m above thepoint where the ball is struck. The ball leaves the club at a speedof 18.9 m/s at an angle of 33.0° above the horizontal. It risesto its maximum height and then falls down to the gree..
It's from safety that a person mustn't be hit by an electromagnetic radiation by a high density more than10 mV /cm2 (milli volt /cm2). Describe the safety level in terms of the electric fields and the magnetic fields for an electromagnetic wave sprea..
βAn observer that is standing 12m from a stereo sound speaker perceives the sound level from the speaker to be 60 dβ. What is the decrease in the physical intensity in watts/m2
Some believe that the positions of the planets at the time of birth influence the newborn. Calculate the gravitational force exerted on the baby by the planet Jupiter (m=1.9*10^27 kg) at its closest approach to the earth
A circuit element is subjected to a sinusoidal AC voltage with frequency of 150 Hz and a peak voltage of Vp = 24.0 V. What are the values of the maximum current?
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