Explain what are wave fronts?

515

---

Explain the law of machines?

569

---

Explain what affect does electricity have on soil?

534

---

Explain the characteristics of dead stars?

508

---

Explain what is meant by 4th dimension?

495

---

Explain what is centrifugal force?

531

---

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

572

---

Explain what is neutral buoyancy?

517

---

Explain how much does automotive oil weigh?

463

---

Name the element which has the simplest absorption spectrum?

483

---

Tell me how are amps and watts related?

486

---

Explain the balanced field takeoff?

524

---

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

484

---

Explain the cause of brownian motion?

524

---

Explain how do you convert from pascal to torr?

473

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