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Questions in physics

📝 Answered - A man on the moon with a mass of 90 kilograms weighs 146 newtons. The radius of the moon is [tex]1.74 \times 10^6[/tex] meters. Find the mass of the moon.

📝 Answered - Two dogs pull on a toy. One pulls with a force of 10 N, the other with a force of 15 N. In what relative directions can the dogs act to give the toy the smallest acceleration?

📝 Answered - What is the acceleration of a 6.4-kilogram bowling ball if a force of 12 N is applied to it?

📝 Answered - A sound wave travels at 330 m/sec and has a wavelength of 2 meters. Calculate its frequency and period.

📝 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?