A spring with spring constant of 33 N/m is stretched 0.15 m from its equilibrium position. How much work must be done to stretch it an additional 0.072 m? 1. 0.420 J 2. 0.486 J 3. 0.552 J 4. 0.398 J 5. 0.376 J 6. 0.464 J 7. 0.574 J

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud

How many atoms of nitrogen are in the chemical formula ni(w on