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Checking a Strip After Repeated Loads 4 questions
Checking a Strip After Repeated Loads
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A workshop uses flexible strips as tabs on a container. A strip must survive one pull of 40 N and at least 200 repeated pulls of 20 N. In the first test a fresh strip is pulled once and the force is increased until it breaks. In the second test a different fresh strip receives repeated 20 N pulls of the same duration.
| Strip material | Force at break in one pull (N) | Repeated pulls completed before breaking |
|---|---|---|
| P | 50 | 80 |
| Q | 48 | 320 |
Question 1
Which tab material can withstand the specified one-time pull and the full series of repeated pulls?
- P only
- Q only
- Both
- Neither
Question 2
A student picks P because it breaks at the greater force in the first test. Evaluate the choice using the other requirement.
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A third material R breaks at 46 N on a single pull. Its repeated-load test stops at 150 completed pulls with the strip still intact.
Question 3
Explain which requirement the record establishes for R and what remains unresolved.
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Question 4
Describe what to do with the repeated-load test of R to finish the comparison. State one condition that should stay the same.
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