Life on Earth remained single celled for ________ years, according to the microfossil record

Fill in the blank(s) with correct word


2.5 billion

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

When the equation Al + O2? Al2O3 is balanced, the coefficient of Al is

a. 1 b. 2 c. 3 d. 4

Physics & Space Science