Explain what are wave fronts?

943

---

Explain the law of machines?

995

---

Explain what affect does electricity have on soil?

993

---

Explain the characteristics of dead stars?

977

---

Explain what is meant by 4th dimension?

948

---

Explain what is centrifugal force?

934

---

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

1004

---

Explain what is neutral buoyancy?

987

---

Explain how much does automotive oil weigh?

939

---

Name the element which has the simplest absorption spectrum?

948

---

Tell me how are amps and watts related?

950

---

Explain the balanced field takeoff?

954

---

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

958

---

Explain the cause of brownian motion?

960

---

Explain how do you convert from pascal to torr?

948

---