IB myp 4-5 physics – Practice Questions- All Topics
Topic :Forces and energy- Measurement in Science
Topic :Forces and energy– Weightage : 21 %
All Questions for Topic : SI units, standard form, compound units, significant figures
Data-based question: Car testing
A car manufacturer is testing a new design of car. They want to know how much CO2 is emitted for every kilometer it drives. They test it three times and get measurements of 147 g km–1, 157 g km–1 and 143 g km–1.
Question:
What is the average amount of CO2 emitted per kilometer driven?
▶️Answer/Explanation
Ans: \(frac{147+157+143}{3}=149 g km^{-1}\)
Question:
The manufacturer states that the car emits less than 150 g km–1. Is this a reliable statement?
▶️Answer/Explanation
Ans: The statement is true in that the average amount of CO2 emitted per kilometer driven (149) is less than 150 g km–1. However, it is not reliably true as one of the tests gave a reading higher than 150 g km–1.
Question:
The trumpeters played a note with a frequency of 698 Hz. If the speed of sound is 340 m s–1, using the physics you learned in Chapter 1, Models, calculate the wavelength of the sound waves
coming from the trumpet.
▶️Answer/Explanation
Ans: (frac{340}{698}=0.49 m)