Explain which way do twin screw props on a boat rotate when propelling the boat forward?

918

---

Explain why does sun appear flat during sunrise and sunset?

913

---

Explain what is the longest lasting synthetic periodic element?

983

---

Tell me what is astrophysics?

928

---

Explain the thermal transformation?

948

---

Tell me what is ion pair energy?

1060

---

Explain what is an alloy?

968

---

Explain what is different between secondary electron image and back scattered electron image?

978

---

Explain what is the measure of the force of gravity on an object?

949

---

Explain how do you find your body volume using a tape measure?

993

---

Explain why does a tea kettle sing?

934

---

Explain what is a positron?

1083

---

Explain the universal law of universal gravitation?

1032

---

Tell me how do you calculate shaft power?

1004

---

Explain what is a crest?

908

---