Isaac Physics

Hi
Can anyone send me the answers to essential pre-uni physics B1, working out would also be helpful if not I have attached the questions so if you could help me out?
https://isaacphysics.org/questions/ch_b_p1
I only need help from E onwards
Thanks

Reply 1

0le

21

For Part E, have you drawn a diagram yet? You should google the definition of a bearing and how to obtain it in terms of an angle. You then have an angle, a hypotenuse and an opposite:
https://revisionmaths.com/gcse-maths-revision/trigonometry/bearings

Part F is a standard Force diagram along an inclined surface:
http://zonalandeducation.com/mstm/physics/mechanics/forces/inclinedPlane/inclinedPlane.html#

You are calculating the component of the force parallel to (i.e. along) the surface

Part G, H and I seem similar to above. For example in Part H you literally model the hill as a triangle and you have a slope that you walk up along. For Part I, you can see the force diagrams here:
https://www.physicsclassroom.com/class/waves/Lesson-0/Pendulum-Motion

For Part J, you need to decompose, not forces, but velocities in a similar manner as before.
https://www.dummies.com/education/science/physics/how-to-find-vector-components/

Reply 2

coffee alert

OP

13

Thank you so much for your help :h:

Reply 3

s231369

1

Original post by 0le

For Part E, have you drawn a diagram yet? You should google the definition of a bearing and how to obtain it in terms of an angle. You then have an angle, a hypotenuse and an opposite:
https://revisionmaths.com/gcse-maths-revision/trigonometry/bearings

Part F is a standard Force diagram along an inclined surface:
http://zonalandeducation.com/mstm/physics/mechanics/forces/inclinedPlane/inclinedPlane.html#

You are calculating the component of the force parallel to (i.e. along) the surface

Part G, H and I seem similar to above. For example in Part H you literally model the hill as a triangle and you have a slope that you walk up along. For Part I, you can see the force diagrams here:
https://www.physicsclassroom.com/class/waves/Lesson-0/Pendulum-Motion

For Part J, you need to decompose, not forces, but velocities in a similar manner as before.
https://www.dummies.com/education/science/physics/how-to-find-vector-components/

I am really struggling with part J. I have done everything else correctly. What is the answer for Part J?

Reply 4

Joinedup

20

Original post by s231369

I am really struggling with part J. I have done everything else correctly. What is the answer for Part J?

It's bad to piggyback a new question onto old threads which people here will think has already been answered ... but it's good to read those old threads to see if you can get some help from the answer to someone else's question... and if not then start a new thread which will have zero replies and signal that it needs looking at :smile:

It's quite a simple calculation so I guess you're having trouble unpacking the question setup.
The question is asking what the magnitude of the component of the fly's velocity is in the north-south direction.

Model the sunlight as parallel rays going east to west
The maximum possible speed would be 0.36 m/s if the fly was moving at 90 or 270 degrees to the suns rays
The minimum possible speed would be 0 m/s if the fly was moving at 0 or 180 degrees to the sun

Isaac Physics

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