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

917

---

Explain why does sun appear flat during sunrise and sunset?

910

---

Explain what is the longest lasting synthetic periodic element?

981

---

Tell me what is astrophysics?

928

---

Explain the thermal transformation?

946

---

Tell me what is ion pair energy?

1056

---

Explain what is an alloy?

967

---

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

975

---

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

945

---

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

990

---

Explain why does a tea kettle sing?

932

---

Explain what is a positron?

1078

---

Explain the universal law of universal gravitation?

1032

---

Tell me how do you calculate shaft power?

1004

---

Explain what is a crest?

907

---