Sketch a velocity time graph for a skydiver jumping out of a plane.

779

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Differentiate y = sinx + cosx + tanx

620

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Explain force?

631

---

How does an aeroplane stay airborne and how can some aeroplanes fly upside down?

590

---

What is the significance of superconductors?

599

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Why do sausages split lengthways, rather than around the circumference?

1014

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Why do windmills never appear stationary?

950

---

How do trains go around bends?

656

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Explain about a light bulb

609

---

If I am in a room with 5 people and guess all their birthdays what is the probability of getting (only) one correct?

755

---

Explain momentum?

603

---

Why did they used to make the mill chimneys so tall?

762

---

What is Moore's law and what limits the size of a computer chip?

603

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A rectangular sheet dimensions a x b is to be made into an open-topped box by cutting a square of side h from each corner and folding the 4 sides up. Find the value of h which allows the maximum volume of the box?

730

---

Please derive the formula for the area of a circle.

626

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