Which is not a device for reproducing sound? phonograph MP3 player gramophone microphone

If a magnetic field is weak how would the magnetic force affected?

How much energy must be removed from a 450 g block of ice to cool it from 0∘c to - 20 ∘c?

What is the mass of a baseball that has a kinetic energy of 100 J and travel at 5 m/s

A patio swing is suspended by two springs, each of which has a force constant of 450 N/m equivalent to a single spring forest constant of 900 N/m. Find the mass of a person sitting on the swing oscillating up and down out of 0.560 Hz.

A rubber ball rolls across a level surface. The ball will eventually stop rolling due to A. electricity B. conductivity C. friction D. magnesium

Convert 1087 ft/s to mi/hr

Using the atomic symbol above report how many protons, neutron, and electrons an atom of neon contains.

Which of the following is not shorthand to describe one of the three types of ecological relationships? +/+ -/+ +/0 -/0

Which is a characteristic of an electromagnetic wave?

What does the ozone layer absorb? a. Microwaves c. UV radiation b. X-rays d. Infra-red radiation