Life on Earth remained single celled for ________ years, according to the microfossil record
Fill in the blank(s) with correct word
2.5 billion
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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
The total number of galaxies in our observable universe is
A) about ten million B) about a hundred billion C) infinite D) a few trillion
A person pushes on a doorknob with a force of 5.00 N. The direction of the force is at an angle of 20.0° from the perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the hinges of the door
The door begins to rotate with an angular acceleration of 2.00 rad/s2. What is the moment of inertia of the door about the hinges? A) 4.28 kg?m2 B) 7.52 kg?m2 C) 1.88 kg?m2 D) 0.684 kg?m2 E) 2.74 kg?m2
When the equation Al + O2? Al2O3 is balanced, the coefficient of Al is
a. 1 b. 2 c. 3 d. 4