Which of the following machines most likely has the greatest efficiency?

a

A. Airplane

B. Automobile

C. Bicycle

D. Human body

A piston uses 32 J of energy to do work as 68 J of heat are added to the cylinder of the piston. The change in internal energy of the system is ___ J.

Why are gamma rays not affected by a magnet as they pass over it?

Which planet has completed less than one orbit of the sun in the last 100 years?

Color depends on what characteristic of light?

Snoopy throws a ball horizontally at 25 m/s from a roof that is 15 m high to hit the cat next door. The ball misses the cat. How far does the ball travel before hitting the ground? How long does it take to hit the ground?

What makes the lumbar vertebrae different from the cervical vertebrae and the thoracic vertebrae?

Matter has Certain types of what

Identify the type of relationship that exists between density and temperature

You are standing on the sidewalk and see a bus drive by. What would be an ideal frame of reference? A bird flying overhead A jogger running along the sidewalk A car driving alongside the bus A tree across the street

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?