A small planet is discovered to have a layer of electrically charged dust floating at 1000 m above the surface because of the balance between the gravitational forces and electrical forces exerted on the dust by the planet. If the dust layer is moved to 2000 m above the surface, what will happen to the dust, and why?
The dust will fall because the gravitational force will be stronger than the electrical force,
А
B
The dust will rise because the gravitational force will be weaker than the electrical force.
с
The dust will continue to float because the gravitational force will still balance the electrical force,
D
What will happen to the dust cannot be determined without knowing the amount of dust moved

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

The ozone hole appears in antarctica during

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0