Explain what are wave fronts?

954

---

Explain the law of machines?

996

---

Explain what affect does electricity have on soil?

998

---

Explain the characteristics of dead stars?

983

---

Explain what is meant by 4th dimension?

956

---

Explain what is centrifugal force?

939

---

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

1008

---

Explain what is neutral buoyancy?

990

---

Explain how much does automotive oil weigh?

943

---

Name the element which has the simplest absorption spectrum?

956

---

Tell me how are amps and watts related?

953

---

Explain the balanced field takeoff?

963

---

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

966

---

Explain the cause of brownian motion?

963

---

Explain how do you convert from pascal to torr?

955

---