Can you help me with these science questions?

Question

1. How many significant figures are in 0.0020100?

2. Whats a device that converts from electrical energy into thermal energy? Would a toaster be a good answer for that?

3. What energy conversion takes place as a sky diver falls to Earth after jumping out of an airplane?

4. How does using energy contribute to acid rain?

5. How does using energy contribute to global warming?

6. What did Dalton do to contribute to the model of the atom?

7. What led scientists to believe that the atom was nont solid and indestructible?

sorry the questions are random

its review for finals! and i have trouble with those questions

if you could answer at least 1 that'd be great

please no witty comments or nasty remarks!

Answer 1

A) there are 5 significant figures.

B) they can be called as heaters.

C) the potential energy is converted to kinetic energy.

D) there is no relation of energy to cause acid rain, the smoke mixes with rain water and converts to some dilute less toxic acids which falls on the ground and destroys the place if the acid is in abundant.

E) when the atmosphere contains carbon dioxide and sunrays is allowed inside the sunrays come inside but cant go back, this is the reason of global warming, the effect is called as greenhouse effect.

F) if introduced the concept of pulm pudding model, that is shape of atoms.

G) unable to understand the question.

Answer 2

dalton created the plum pudding model of the atom. There was a positively charged material with electrons in it and no neutrons.

Answer 3

hahaha messman

i dont remember all of these fromt his year but ill try

1. 5?

2. ya! it works really well actually

3. gravitational potential to something back and forth. we had some wkshts and quizzes with this on it.

4. cuz the gases are evaporated with water

5. emission of greenhouse gases

6. check the packet of them all

7. cuz witht he foil experiment-they didnt all bounce and stuff. the book explains this well.

the book is really good at explaining all of these! check there. sorry i know how incredibly helpful i was. lol.