What is the speed of sound in air at 30 degree C?

Suppose for an unexplained reason a star near Earth started shrinking. At what stage is the gravitational force between Earth and the star the greatest?

Using a common metric ruler, you measure the separation distance between two Al spheres from center to center to be 2.3 cm. What is the lowest uncertainty that you can use with this measurement? a. 0.5 mm b. 1.0 mm c. not possible to tell d. 0.

The energy of an mechanical wave is related to its amplitude. True False

What do scientists use observations for?

there are two uncharged objects, A and B. some electrons move from A to B. How does the charge of two objects change?

Which activity involves using fossil fuels directly or indirectly? 1) eating fresh fruit for a snack 2) cooking hot dogs on a campfire 3) using crayons to color 4) walking to school

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction

Where would aliens be if they really do exist here on Earth?

If the mass of an object is 84g and the volume is 12cm3 what is the density