Which statement is true of simple machines They cannot change the direction in which you apply a force.

They cannot change the amount of work done.

They cannot change the distance over which you apply the force.

They cannot make work easier.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Part a constants huck finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion what is huck's velocity (speed and direction) relative to the river bank? express your answer to three significant figures and include the appropriate units. relative to the shore)

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics