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Questions in physics

📝 Answered - Which substance—wood or steel—is the better conductor? A conductor is a material that requires very little heat energy to experience a change in temperature. Explain your answer.

📝 Answered - A train travels 225 kilometers in 2.5 hours. What is the train’s average speed?

📝 Answered - A compact disc has a radius of 6 centimeters. a. What is its circumference in meters? b. If the CD rotates 4 times per second, what is the linear speed of a point on the outer edge of the CD? Give your answer in meters per second. c. What is the linear speed of a point 3 centimeters from the center of the CD? (Assume the angular speed has not changed.)

📝 Answered - A hair dryer uses 72,000 joules of energy in 60 seconds. What is the power of this hair dryer?

📝 Answered - A 72-tooth gear is connected to a 12-tooth gear. If the large gear makes one complete turn, how many turns does the small gear make?

📝 Answered - How are different types of radiation arranged along the electromagnetic spectrum?

📝 Answered - A woman lifts her 100-newton child up one meter and carries her for a distance of 50 meters to the child's bedroom. How much work does the woman do?

📝 Answered - How far will you travel if you run for 10 minutes at 2 m/sec?

📝 Answered - What is the average speed of a car that traveled 300.0 miles in 5.5 hours?

📝 Answered - Determine the amount of potential energy of a 5-newton book that is moved to three different shelves on a bookcase. The height of each shelf is 1.0 meter, 1.5 meters, and 2.0 meters.