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# M1 Question watch

1. A wire AB 10 metres long is bent into an arc of a circle. It is mounted in a vertical plane so the tangent at B is horizontal and the tangent at A is at 40 degrees to the horizontal, with the level of B below the level of A. A bead of mass 2 grams is threaded on the wire at A and released. Find its speed when it reaches B
a. if the wire is smooth
b. if there is a resistance of constant magnitude 0.004 newtons

The answers are 8.10 and 5.07. I have already drawn a rough diagram of the situation but I'm facing difficulty calculating the radius of the arc. Is it necessary to calculate the radius of the arc in order to find out the GPE?
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

Just quoting in Danny Dorito so she can move the thread if needed
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(Original post by Danny Dorito)
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3. (Original post by Sanjana Namreen)
A wire AB 10 metres long is bent into an arc of a circle. It is mounted in a vertical plane so the tangent at B is horizontal and the tangent at A is at 40 degrees to the horizontal, with the level of B below the level of A. A bead of mass 2 grams is threaded on the wire at A and released. Find its speed when it reaches B
a. if the wire is smooth
b. if there is a resistance of constant magnitude 0.004 newtons

The answers are 8.10 and 5.07. I have already drawn a rough diagram of the situation but I'm facing difficulty calculating the radius of the arc. Is it necessary to calculate the radius of the arc in order to find out the GPE?
What exam board is this question from?
4. (Original post by Reshyna)
What exam board is this question from?
Cambridge
5. (Original post by Sanjana Namreen)
A wire AB 10 metres long is bent into an arc of a circle. It is mounted in a vertical plane so the tangent at B is horizontal and the tangent at A is at 40 degrees to the horizontal, with the level of B below the level of A. A bead of mass 2 grams is threaded on the wire at A and released. Find its speed when it reaches B
a. if the wire is smooth
b. if there is a resistance of constant magnitude 0.004 newtons

The answers are 8.10 and 5.07. I have already drawn a rough diagram of the situation but I'm facing difficulty calculating the radius of the arc. Is it necessary to calculate the radius of the arc in order to find out the GPE?
Yes, you will need the radius of the arc to calculate the height of the bead at A.

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Updated: January 8, 2017
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