Dust settling out of the air

chemical change or physical change

Two teams of nine members each engage in a tug of war. Each of the first team's members has an average mass of 68 kg and exerts an average force of 1350 N horizontally.

An ice cube floats in a glass of water. Which of the following statements is true? Heat will flow from the water into the ice. Heat will flow from the ice into the water. Cold will flow from the water into the ice.

A rock thrown with speed 12.0 m/s and launch angle 30.0 ∘ (above the horizontal) travels a horizontal distance of d = 15.5 m before hitting the ground. from what height was the rock thrown? use the value g = 9.800 m/s2 for the free-fall acceleration.

Cu (s) + AgNO3 (aq) → Cu (NO3) 2 (aq) + Ag (s) The unbalanced equation for the reduction of silver nitrate by copper is shown here. What is the coefficient for Cu (NO3) 2 in the balanced equation?

The mechanical energy of an object equals its A. chemical energy plus its nuclear energy. B. kinetic energy plus its potential energy. C. nuclear energy. D. thermal energy.

The sun generates both mechanical and electromagnetic waves. Which statement about those waves is true? The mechanical waves reach Earth, while the electromagnetic waves do not.

A 3-kg mass is in free fall. What is the velocity of the mass after 7 seconds?

How does the role of blood protect the body

What is the objects velocity if the momentum is 6.0 kg•m/as

Which of the following scientists did not support the wave motion of light? A. Fresnel B. Maxwell C. Newton D. Arago