PISA Style Question
Bloodhound
Read the text about the Bloodhound land speed record attempt.
The Bloodhound SCC project is an attempt by a British team to set a new land speed record. The team is aiming to break the 1000mph barrier with the rocket propelled car. The attempt will probably take place at the Hakskeen Pan Desert in South Africa in 2016 or later.
Record Course and Timing
In order to break the record the car must complete 2 passes through the measured mile in opposite directions. To qualify for a record, BLOODHOUND will need to cover the distance twice within 60 minutes. The timing must be conducted by an approved timekeeper from the national sporting authority, using approved timing equipment.
The length of the course must be measured to an approximation of 1/10,000th of its length.
For a measured mile, this is an accuracy of 16 cm or less.
Both times are recorded with an accuracy of 1/1000th of a second and the mean time is calculated with an accuracy of 1/1000th of a second.
Question 1 : BLOODHOUND
The maximum speed of the Bloodhound car is designed to be 1050mph (1690kmh). Which of the following statements best describes why any vehicle must have a maximum speed?
A Safety considerations mean that it dangerous to go above a particular speed.
B Legally every vehicle must have a maximum speed.
C It is only possible to design an engine with a particular efficiency.
D The thrust of the engine will eventually balance frictional forces.
Question 2 : BLOODHOUND
Travelling at 1000mph, which of the following times is the best estimate of how long the Bloodhound car will take to cover a mile?
A 6 seconds
B 0.6 seconds
C 3.6 seconds
D 0.16 seconds
Question 3 : BLOODHOUND
The acceleration time for the Bloodhound car is currently estimated at about 55 seconds to accelerate from rest to 1000mph. Which of the following is the best estimate of how far the car travels whilst accelerating? (1000mph is about 447m/s).
A 8.1km
B 12.3km
C 24.6km
D 55km
Question 4 : BLOODHOUND
The ISA (the organisation who oversee all speed record attempts) have a rule that the distance must be covered twice in opposite directions with both attempts in an hour or less. Circle ‘yes’ or ‘no’ for each statement about why they have this rule.
Yes or No ?So that the record attempt is less influenced by wind speed and direction. / Yes / No
So that the record attempt is less influenced by air temperature. / Yes / No
So that the record attempt is less influenced by the gradient of the course. / Yes / No
So that the record attempt is less influenced by the surface of the course. / Yes / No
Question 5 : BLOODHOUND
The accuracy of the course measurements (distance and time) are very important if the record attempt is to be valid. Which of the following is the best estimate of the percentage uncertainty in the distance measurement?
A 0.1%
B 0.01%
C 0.001%
D 0.0001%
Question 6 : BLOODHOUND
The text explains that the course is covered twice and a time measured for each attempt with an accuracy of 1/1000th of a second. In this case, which of the following are valid reasons for taking an average of the two measurements?
Yes or No ?To reduce systematic errors in timing. / Yes / No
To reduce random errors in timing / Yes / No
To eliminate anomalous results before calculating a mean / Yes / No
To ensure that the timing device is reliable. / Yes / No
Question 7: BLOODHOUND
Question 8: BLOODHOUND
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SCORING : BLOODHOUND
Question 1
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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Question 7
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Question 8 : BLOODHOUND
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