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You set your time machine for earth 3 billion years ago and push the start buttom. When the dust clears, you look out the window. Which of the following best describes what would be there?

Two charges are separated by a distance d. If one the charges is doubled while the other is tripled, what happens to the force between the charges?  

If current through a resistor is 30 mA when the applied voltage is 6 V. The resistance (in ohm) in the circuit is

A dielectric slab is slowly inserted between the plates of a parallel plate capacitor while the capacitor is connected to a battery.  As it is being inserted:

A metal rod is placed between two temperature sources so that heat can flow between them. One temperature is 90.0°C and the other temperature is 25.0°C. The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2. If 15.0 watts of heat flows between the hot temperature and the cold temperature, then what is the coefficient of thermal conductivity for the metal? 

The specific heat capacity of water is 4200 J/kg0 c. How much heat energy is required to change the temperature of 5.0 Kg of water from 250C to 850C?

According to the principle of calorimetry

An aluminum flagpole is 23 m high. By how much does its length increase as the temperature increases by 43 C°? (The linear expansion coefficient of aluminum is 23 × 10-6 /C°.)

The epicardium is best described as:

Large arteries are primarily classified as: