EXPLANATION
Question: What are the dimensions of impulse?
- a) ML²T⁻¹
- b) MLT⁻¹
- c) M²L²T⁻¹
- d) MLT⁻¹
ANSWER: b) MLT⁻¹
EXPLANATION:
The dimension of impulse is given by the symbol "J" and is defined as the change in momentum of an object. The correct dimension of impulse is:
b) MLT⁻¹
In this dimension, M represents mass, L represents length, and T represents time. The dimension for mass is 1 (M) because impulse involves the change in momentum, which has the dimension of mass times velocity. The dimension for length is 0 (L⁰) because impulse is not directly related to length. The dimension for time is -1 (T⁻¹) because impulse is measured as the product of force and time, and force has the dimension of mass times acceleration (MLT⁻²), which when multiplied by time (T), gives the dimension MLT⁻¹ for impulse.