Explain how has the earth changed since it was formed?

809

Name the minerals that attract lightning?

805

What is transverse wave motion?

1017

How do you calculate tensile strength?

1040

I just want to convert the voltage into current i.e. suppose I have 750V & 1A AC power then I want to convert it into 12V & 62A DC power only difficulty is that I don't want to use the tranceformer. Simply to say, I want to make the step-down without using tranceformer. Please, give me some ideas. And also I want the relation between Magnetic Induction & Weight of the body can be levitated. Or I can say, how much of magnetic induction requires to lift 500gms weight? I am heartily thankful to you.

2215

What is the velocity of sound air?

1139

For measuring weight of 2cm3 piece of density 4gm/cm3 which spring balance is best suited what is the range and least count how we calculate

1680

What evidence is there supporting the big bang theory?

900

What resources do manitoba mines produce?

1260

Explain the general statement regarding the temperature of water in oceanic depths?

740

What is drift (or drive)?

801

we know when two atom combine,the electrions are in valance band,but in case of semiconductor doner or acceptor level are above of v.. whyb

1942

Describe the formation of igneous rocks?

836

What is diamond?

841

How does laser printer works?

977