physics

A body moving with uniform acceleration has two points(5, 15) and (20, 60) on the velocity-times graph of its motion. Calculate

A. 0.25ms−² B. 3.00ms−² C. 4.00ms−² D. 9.00ms−² E. 16.00ms−² Correct Answer: Option B - 3.00ms−²

5 years ago

A ball is projected horizontally from the top of a hill with a velocity of 20m/s. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10m/s²)

A. 20m B. 40m C. 80m D. 160m E. 200m Correct Answer: Option C - 80m Explanation Initial horizontal velocity…

5 years ago

A body moves with a constant speed but has an acceleration. This process if it?

A. moves in a straight line B. moves in a circle C. is oscillating D. is in equilibrium E. has…

5 years ago

Which of the following is a fundamental quantity _______?

A. speed B. density C. length D. impulse E. energy Correct Answer: Option C - length

5 years ago

An electric string of length l is elastically stretched through a length e by a force F. The area of cross-section of the string is A and its Young’s modulus is E. Which of the following expressions is correct?

A. F = EA/eI B. F = EAI/e C. F = EAe/l D. F = EAe Correct Answer: Option C…

5 years ago

The process by which a metal, heated to high temperature, gives off electrons from its surface is known as

A. photoelectric emission B. thermionic emission C. radioactive emission D. Held emission E. secondary emission Correct Answer: Option B -…

5 years ago

A sheet of paper is placed in the path of a beam of radiations from a radioactive source. Which of the following radiations will pass through the paper?

I. Alpha rays II. Beta rays III. Gamma rays A. I only B. II only C. III only D. II…

5 years ago

When the nucleus of a uranium atom is split into two fragments of nearly equal mass the sum of the masses of the fragments is less than the mass of the original nucleus. This difference is a measure of the?

A. experimental error in calculating the separate masses B. change of momentum of each fragment C. potential energy lost D.…

5 years ago

An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years?

A. 1 N atoms 8 B. 1 N atoms 3 C. 2 N atoms 3 D. 5 N atoms 6…

5 years ago

Which of the following gives rise to the line spectra obtained from atoms?

A. Kinetic energy of a moving atom B. Potential energy of an electron inside an atom C. Change of an…

5 years ago
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