Sound travels at a speed of about 340m/s in the air. How long will it take an explosion to be heard from a distance of 20 miles away?

List how many significant figures the numbers contain. A. 205 cm. B ...00004 cm. C. 20 cm. D. 20. Cm.

What are some examples of static force?

The amount of sunlight received at Earth's surface fluctuates more at the poles than the equator. a. True b. False

A mother and daughter are on a seesaw in the park. How far from the center must the 124 lb mother sit in order to balance the 46 lb daughter sitting 8 ft from the center. Answer in ft 1. 4.31 2. 2.35 3. 3.08 4. 3.47 5. 3.36 6. 3.94 7. 1.99 8. 3.

To calculate the specific heat capacity of some liquid, we have poured 235 g of water at a temperature of 18.0°C into 250 g of this liquid at a temperature of 27.0 °C in a calorimeter with a heat capacity of 210 J/K. The temperature stabilized at 20.

Which statement is true about the atom? A: it contains positive electrons, uncharged protons and negative protons. B: it contains uncharged neutrons, positive electrons and negative protons.

Steel objects can become temporary magnets because they are mainly composed of which element?

How long does it takes the sun to rotate the earth?

Which explains how winds move?

Why is it important to develop alternative energy sources