Explain what are wave fronts?

907

---

Explain the law of machines?

945

---

Explain what affect does electricity have on soil?

942

---

Explain the characteristics of dead stars?

910

---

Explain what is meant by 4th dimension?

895

---

Explain what is centrifugal force?

885

---

Explain how do fireworks turn into shapes like hearts and stars?

933

---

Explain what is neutral buoyancy?

929

---

Explain how much does automotive oil weigh?

885

---

Name the element which has the simplest absorption spectrum?

894

---

Tell me how are amps and watts related?

896

---

Explain the balanced field takeoff?

888

---

Explain what is larger the force the earth exerts on you or the force you exert on the earth?

906

---

Explain the cause of brownian motion?

897

---

Explain how do you convert from pascal to torr?

895

---