Is eating a sandwich 100% efficient

A conducting copper wire has a 2.0mm diametr, a 1.5 length, and a 50 m resistance. What is the resitivity of the wire? What general information would you need to find out in order to answer the question

What is newstons 2nd law

Calculate the efficiency of an engine in a power plant operating between 40 ° c and 320 ° c. remember that the efficiency is a decimal number less than 1.

Two masses are joined by a massless string. A 30-N force applied vertically to the upper mass gives the system a constant [Ans : 490 N] [Ans : 1.3 * 10-23 m] [Ans : 19 cm] [Ans : 1.96 ms-2 ] [Ans : 680 m] upward acceleration of 3.2 m / s 2.

At some instant the velocity components of an electron moving between two charged parallel plates are vx=2.5*105m/s and vy=5.0*103m/s . Suppose the electric field between the plates is uniform and given by E⃗ = (120N/C) j^ .

What is 1/3 of 300

What geologic features might form at the surface of plate A?

Is it true that mollusks that live in water have lungs

Which is a true statement about waves? A They always travel in every direction at the same time. B. They travel at different speeds through different materials. c. They cannot travel through liquids or solids. D.

What is s the best description of the constructive interference of light? A. two waves have the same direction of displacement. B. two waves have displacement in opposite directions. C. a longitudinal wave meets a transverse light wave D.