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

How much time would it take for an airplane to reach its destination if it traveled at an average speed of 790 km/hr for a distance of 4,700km? What is the airplane's speed in miles/hour?

Heat a liquid high enough and it will change into a

archer shoots his arrow towards a target at a distance of 90 m, and hits 'bullseye'. Calculate the acceleration and time taken by the arrow to hit the target with a velocity of 90.0 m/s

If the mass of the tritium nucleus is 3.02 universal mass units and the mass of the helium nucleus is 4.00 universal mass units, how much energy (in Megaelectronvolts) is absorbed as the tritium decays into helium?

A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333). To the nearest degree, at what angle relative to the normal to the interface of the two liquids is light totally reflected? a. 78 degree b. 88 degree c. 68 degree d. 49 degree e.

How long does it take the moon to go from full-moon phase to new-moon phase

What is the rule of calculation of elastic potential energy?

In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge.

What has more momentum: a sports car moving at 100 mph or a train that is not moving?

What is your mass in kilograms?