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 180 meter long train, travelling at a constant speed, is passing a car driving on an adjacent lane at a speed of 72 km/h. Knowing that the overshoot lasted 60 seconds, what is the speed of the train in km/h?

Explain the effects of the endocrine system on development.

Which of the following best describes gravity? A Gravity can be an attractive or a repellant force. O B. Gravity is neither an attractive nor a repellant force O C. Gravity is always an attractive force. O D. Gravity is always a repellant force

An object accelerates at 5 m/s2, over a 3 second time period to a final velocity of 20 m/s. What is the initial velocity?

A prediction A. is not a strategy used in a scientific investigation. B. is the final step in a scientific investigation. C. is an optional step in a scientific investigation. D. is a necessary step in a scientific investigation.

What career has to do with one of these listed ... fossil fuels, nuclear energy, biomass, hydropower, solar energy, geothermal energy, or wind energy.

An object is suspended from the ceiling with two wires that make an angle of 40° with the ceiling. The weight of the body is 150 N. What is the tension in each wire? 41.6 newtons 82.3 newtons 150 newtons 117 newtons

What is the value of 9682 when rounded to three significant figures

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series