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PHY 101 PHY 101 Past Questions Objective Question
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Question

The position y of a particle moving along the y axis depends on the time t according to the equation y = at - bt². The dimensions of the quantities a and b are respectively:
Options
A L/T, L/T²
Correct Answer
B L/T, L/T²
C L/T², L/T
D L/T, L²/T
Correct Answer

Option A is the correct answer.

Detailed Explanation

Each term must have dimensions of length [L]. So [a t] = L => [a] T = L => [a] = L T⁻¹. And [b t²] = L => [b] T² = L => [b] = L T⁻². So a has dimensions of velocity, b has dimensions of acceleration.

Hint

Each term in the sum must have the same dimensions as y (length).

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1127 of 1250
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