Two of Dalton's theories were disproven:

1. All atoms of a given element are the same.

2. Atoms can't be divided into smaller pieces.

Q: Who disproved theory 1?

A:?

Q: Who disproved theory 2?

A: J. J. Thompson?

What is the speed of a walking person in m/s if the person travels 1000 m in 1200 seconds?

Sheila did 110 J of work to move a chair 2 m to the right. How much force did Sheila use to Sheila use to move the chair

A spherical conductor of radius 15.5 cm has net charge Q = 0.66 µC. Calculate the electric potential at the following distances from its center, assuming the electric potential goes to zero at an infinite distance from the sphere.

You drive a car for 2.2 h at 45 km/h, then for another 2.2 h at 60 km/h. what is your average velocity?

Imagine you have a mixture that contains iron filings (small pieces of iron metal), sand, poppy seeds, and salt. You have the following materials: water, beaker, funnel, filter paper, magnet, graduated cylinder, tweezers, and hot plate.

What is the difference between unicellular and multicellular organisms?

Is momentum conserved in the collision?

Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?

In a laboratory, you determine that the density of a certain solid is 5.23*10-6kg/mm3. Convert this density into kilograms per cubic meters.

List the solar objects in correct order from the Sun. Venus Earth Mercury Saturn Neptune Mars Jupiter Asteroid Belt The Sun Uranus