The ignition of helium in the core of a star changes the structure of the star. The star now makes energy in two locations by two different processes, _____
A) carbon fusion in the core and helium fusion in the surrounding shell
B) helium fusion in the core and nitrogen fusion in the surrounding shell
C) helium fusion in the core and hydrogen fusion in the surrounding shell
D) nitrogen fusion in the core and helium fusion in the surrounding shell
C
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The walls of an ice chest are made of 2.00-mm-thick insulation having a thermal conductivity 0.00300 W/m ? K
The total surface area of the ice chest is 1.20 m2. If 4.00 kg of ice at 0.00°C are placed in the chest and the temperature of the outside surface of the chest is 20.0°C, how long does it take the ice to melt under steady state conditions? The latent heat of fusion of water is 79.6 cal/g = 334 kJ/kg. A) 4.22 h B) 22.1 h C) 17.6 h D) 1.33 d E) 10.3 h
A heat island is annoying but not dangerous to health
What will be an ideal response?
A car moves from the point (3.0 m)x + (5.0 m)y to the point (8.0 m)x - (7.0 m)y in 2.0 s. What is the direction of the average velocity of the car?
A) 67° from the x-axis B) -67° from the x-axis C) 33° from the x-axis D) -33° from the x-axis E) 52° from the x-axis
If a spaceship of proper length 40 m is measured to have a length 30 m, how fast is it moving?
A. 0.50 c B. 0.81 c C. 0.75 c D. 0.66 c E. 0.43 c