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

865

---

Explain why does sun appear flat during sunrise and sunset?

861

---

Explain what is the longest lasting synthetic periodic element?

935

---

Tell me what is astrophysics?

878

---

Explain the thermal transformation?

877

---

Tell me what is ion pair energy?

959

---

Explain what is an alloy?

914

---

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

919

---

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

880

---

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

936

---

Explain why does a tea kettle sing?

881

---

Explain what is a positron?

998

---

Explain the universal law of universal gravitation?

947

---

Tell me how do you calculate shaft power?

939

---

Explain what is a crest?

853

---