Steel is a mixture of iron and carbon. It can be separated into iron and carbon by melting it. What is steel?

A. A compound

B. An element

C. A molecule

D. An alloy

A wave has a wavelength of 3.3m and a speed of 5.6m/s. What is the frequency of this wave?

Un automóvil recorre una distancia de 86km a una rapidez media de 8m/s Cuantas horas requirió para completar el viaje?

Find the time t it takes the current to reach 99.999% of its maximum value. assume that r=10 ohms and l=50 millihenrys.

The paths of fragments of fireworks are called

100 drops of oil fell from the burette. The first and final reading we're 28.6 cm cubed and 31.1 cm cubed. What is the average volume of the oil.

A rocket is shot straight up from the earth, with a net acceleration (acceleration by the rocket engine minus gravitational pullback) of during the initial stage of flight until the engine cut out at sec.

Which moon has a thick atmosphere made mostly of nitrogen?

J. J Thompson proposed that atoms were made up of positively charged particles with electrons scattered into them. How did he reach this conclusion?

A bathroom scale is compressed 0.21 in. when a 210 -lb person stands on it. Assuming that the scale behaves like a spring that obeys Hooke's law, how much does someone who compresses the scale 0.06 in.

Explain what happens when a ferromagnetic material is made into a permanent magnet.