Particles can enter the air by

When was the last volcanic eruption in the world? what is the name of the volcano?

When a metal bonds with a nonmetal, they form a (n) a. molecule b. ionic compound c. element d. covalent compound

You take out your best silver spoons and notice that they are very dull and have some black spots.

A cameraman sitting near the open door of a news helicopter accidentally drops his 140-g mobile phone out the door at an altitude of 990 m. How fast will the phone be falling when it strikes the ground? A. 9.8 m/s B. 140 m/s C. 850 m/s D. 990 m/s

By how much does a 64.3 kg mountain climber stretch her 0.910 cm diameter nylon rope when she hangs 32.2 m below a rock outcropping? (For nylon, Y = 1.35 â 10^9 Pa. Enter your answer in centimeters.)

What is the weight of a 250 g bag of sweets?

Work is done on a ball when a soccer player kicks it. Is the player still doing work on the ball as it rolls across the ground? Explain

Light of wavelength 441.1 nm falls on two slits spaced 0.29 mm apart. What is the required distance from the slits to the screen if the spacing between the first and second dark fringes is to be 4.0 mm?

A car advertisement states that a certain car that emily miller loves can accelerate from rest to 70 km/h in 7 seconds. Find the cars average acceleration

A stone is thrown up from a platform with an initial velocity of 19.8 m/s. if the top of the platform is taken to be the ground level, calculate, (a) the time taken to reach the maximum height, (b) the maximum height reach by the stone (c) its