A train is 240 meters long and travels 20 m/s. How long does

it take to cross a 360-meter long bridge?

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Which of the following is true of semiconductors? A. Exposing a crystal of a semiconductor to heat or light starts displacing valence electrons, which then move throughout the crystal. B.

Anthony and Sissy are participating in the "Roll-a-Rama" rollerskating dance championship. While 75.0-kg Anthony roller skates backwards at 3.0 m/s, 60.0-kg Sissy jumps into his arms with a velocity of 5.0 m/s in the same direction.

An astronaut throws a rock horizontally on the moon with a velocity of 7 m/s. Assuming no air resistance, what will be the final velocity of the object in the x direction if the moon is about 1/100th the mass ofEarth?

Isaac Newton's investigations of gravity explained which of the following? A. Earth is not the center of the universe. B. Jupiter has more moons than earth. C. Gravity acts on all objects in the universe. D. The sun is more massive than earth.

What frequency corresponds to a period of 4.31s. T = 1/f = 1/4.31s = 0.232hz correct?

A 2-kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it reaches terminal velocity

What is the approximate increase in size from a 1 w to a 2w carbon resistor?

I am looking for this answer : Which shows a correct order of steps in the scientific method? develop a hypothesis, analyze data, make observations, draw conclusions make observations, draw conclusions, develop a hypothesis, analyze data.

A gas in a piston is compressed doing - 439 j of work, and its internal energy increases by 318 j. how much heat flows? (be careful with + and -. + w = expansion. + q = added, + u = temp goes up) (unit = j)

A loop of wire is placed in a uniform magnetic field. (a) For what orientation of the loop is the magnetic flux a maximum? The plane of the loop is perpendicular to the magnetic field. The plane of the loop is parallel to the magnetic field.