# Weird globe

1. Nov 5, 2008

### soupastupid

1. The problem statement, all variables and given/known data
there is a block sliding down a big globe in Italy.

2. Relevant equations

uhh

3. The attempt at a solution

does the globe have its own gravity?

i'm thinking its A and C.

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2. Nov 5, 2008

### Redbelly98

Staff Emeritus
No, the globe doesn't have any significant gravity of it's own. Just use the Earth's gravity.

3. Nov 5, 2008

### soupastupid

and so it is a and c

becuz

once the block leaves the globe

nothing is pushing the box up (but friction) and nothing is slowing the box down in the horizontal direction (but friction)

and so the only force is the earth?

right?

4. Nov 6, 2008

### Redbelly98

Staff Emeritus
Yes, the only force is the Earth's gravity. (So no friction.)

5. Nov 6, 2008

### soupastupid

im thinking

centripital acceleration cannot be zero becuz

is it zero? i dont think so becuz its traveling on a circular path prior to leaving the globe

normal force must be zero becuz nothing is pushing up

the net acceleration is down and its velocity is going right and down

the kinetic energy cannot equal its potential energy becuz you cannot tell if the box is halfway down the globe right?

so the only choice is normal force right?

B

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