Makoto

A white block has appeared on my desktop and on my word documents, this all started while using word, i cannot get rid of it please help me, I'm using a macbook, so it can't be a virus. how do i get rid of it?

A water pump is marked 1500W, but is in actual fact only 80% effective. How long will it take to pump 5kl of water from a depth of 30m from a bore-hole? 1l water has a mass of 1kg.

i got 1225 seconds... unfortunately there is no memo, so i'm not entirely confident. did i get it right? if not can you show me how?

A toy car is pulled in opposite directions by a boy with a force of 15N and a girl with a force of 10N. Friction is negligible. The gain in kinetic energy of the car after a distance of 4m had been covered is.

A: 20

B: 40

C: 60

D: 100

please explain your answer... i have a test tomoro (i.e. it's not for homework)

on tuesday i have a creative writing test. we will have to write an essay of about 500 words. The topics are usually so vague that you can write whatever you want. So i want to prepare a story line for the essay, except im struggling to think of anything. so if you have any ideas... death and tribulation is welcome. thanks.

So, my mom has that newish Honda Civic that looks like a space car (im not sure what model) and it's beeping a rather lot while we are driving. if i had to guess i would think that the car sensory thing is malfunctioning, does anybody know how to just switch it off? it's driving me crazy!

Show that the tangents to the circle x^2 +y^2 - 6x +4y + 8 = 0 at the points where it intersects the line 3x+y=12, are mutually perpendicular.

i can use the chain rule, i can do implicit differentiation, but the added complexities have put it beyond me, please help. it is quite a long question so any guidelines would be appreciated, even if you dont do it for me step by step.

What is the magnitude of the repulsive force between two bodies with charges 10uC and 100uC if the bodies are 10cm apart?

I got 900N am i right? my book doesnt give me answers.

Whenever you google 241543903 it comes up with people sticking their heads in fridges, what does it mean?!! when did it start? how?