Calculate the earth's gravity force on a 60 kg astronaut who is repairing the hubble space telescope 600 km above the earth's surface express your answer using two significant figures. 2.) compare this gravity force with his weight at the earth's surface. express your answer using two significant figures.

3.) in view of your result, explain why we say astronauts are weightless when they orbit the earth in a satellite such as a space shuttle. is it because the gravitational pull of the earth is negligibly small?

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above