Nan is rubbing a rock on the sidewalk. The rock gets smaller, and

dust is formed. Which type of change is happening?

O a change of state

O physical weathering

chemical weathering

O a new substance being formed

A proton of mass m moving with a speed of 3.0 * 106 m/s undergoes a head on elastic collision with an alpha particle of mass 4m at rest. What are the velocities of the two particles after the collision?

Calculate the angle of refraction of 30.0° light shines from water into ice. The indices of refraction for water and ice are 1.36 and 1.31, respectively. A) 19.8° B) 31.3° C) 40.9° D) 64.0°

You can tell the difference between positively charged and negatively charged particles by passing them through an electrical field; the positively charged particles are repelled from the negatively charged particles are attracted to it 1. True 2.

How can you make the work output of a machine greater than the work input

A student used a yardstick to model elastic rebound. The student bent the stick without breaking it and then let the stock go. What does the bent stick represent in the student's model? A. The Rock's original shape B. A siesmic wave C.

7 factors that can affect physical fitness

A force of 100 newtons is applied to a box at an angle of 36º with the horizontal. If the mass of the box is 25 kilograms, what is the horizontal acceleration of the box?

The ATP synthase complex allows ATP production by A. proton-driven rotation of the Fo subunit, which causes F1 to change conformation due to that rotation, allowing ADP to be phosphorylated to ATP. B. substrate-level phosophorylation. C.

How to reverse the heating effects of electric curent

To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. in one such episode, a 600 g falcon flying at 20.0 m/s ran into a 1.50 kg raven flying at 9.00 m/s.