Question 22N.2.SL.TZ0.1c.i
| Date | November 2022 | Marks available | [Maximum mark: 3] | Reference code | 22N.2.SL.TZ0.1c.i |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Determine | Question number | c.i | Adapted from | N/A |
A raindrop falls vertically from rest.
The graph shows how the speed of the raindrop varies with time t.
During the first 3.0 s of motion, the raindrop falls a distance of 21 m and reaches a speed of 9.0 m s−1. The mass of the raindrop is 34 mg. The temperature of the raindrop does not change.
Determine the energy transferred to the air during the first 3.0 s of motion. State your answer to an appropriate number of significant figures.
[3]
«loss in» GPE = 3.4 × 10−5 × 9.81 × 21 «= 7.0 × 10−3» «J»
OR
«gain in» KE = 0.5 × 3.4 × 10−5 × 9.02 «= 1.4 × 10−3» «J» ✓
energy transferred to air «=7.0 × 10−3 − 1.4 × 10−3» = 5.6 × 10−3» «J» ✓
any calculated answer to 2 sf ✓
Allow [1] through the use of kinematics assuming constant acceleration.
Allow ECF from MP1.
Generally well answered, although several candidates lost a mark, usually as POT (power of ten) by quoting the value in kg leading to an answer of 5.3 J. Most candidates were able to score MP3 by rounding their calculation to two significant figures.
