Which is a tool used by scientists to determine the composition of objects?

a hologram

a spectrometer

a wave front

a prism

If cast iron is such a hard metal why dont the military use cast iron to armor their tanks? Is it cuz cast iron is such a heavy metal that itll make the tank slow? Or is there not enough of cast iron on earth?

Does a source moving affects light?

What mathematical formula correctly expresses the relationship between force, mass and acceleration? A. m = F + a B. F = m / a C. a = mF D. F = ma

If a drag racer wins the final round of her race by going an average speed of 92.5 m/s in 4.5 seconds, what distance did she cover

The laws of superposition and original horizontality are best applied to 40% sedimentary rocks all rock types metamorphic rocks 50% igneous rocks 0%

A 7 kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat's gravitational potential energy relative to the floor?

What two factors determine the speed of sound

Is electric charge a property of just electricity or is charge a property of all atoms?

Which of the gases found in the Earth's atmosphere is an important factor for weather conditions? A) oxygen B) hydrogen C) nitrogen D) water vapor

How do repeater stations improve the quality of a broadcast?