Hey! Sorry about this, I'm intruding on a completely unrelated thread but I need advice quickly! Sorry about this. Would you mind taking at look at this thread and sharing your thoughts? Thankyou.
Let m1 be Albert's mass and m2 be Bella's mass and the acceleration on the lift be a. As a force of 678N is exerted on Albert then 678−m1g=m1a(1). Similarly, 452−m2g=m2a(2).
Now, considering the lift:
3995−(250+m1+m2)g=(250+m1+m2)a(3).
Substitute (1) and (2) into (3).
Edit: Also, did you make a typo and should the tension in the cable of the lift be 3955 N?
I'm probably wrong, but isn't it easier to consider just the lift only for part a)?
I don't think you can do it that way. Could you explain your working at all?
OK, have a look at this diagram:
The forces that act on the lift are shown. Due to Newton's third law, the force exerted on the people by the lift is equal to the force exerted by the people on the lift, so those act on the lift downwards. The weight of the lift (250g) also acts downwards. The tension in the cable is 3955N and acts upwards. You want to find a (in orange )
The forces that act on the lift are shown. Due to Newton's third law, the force exerted on the people by the lift is equal to the force exerted by the people on the lift, so those act on the lift downwards. The weight of the lift (250g) also acts downwards. The tension in the cable is 3955N and acts upwards. You want to find a (in orange )
Trying not to burden you again, but does gravity act on an object moving upwards underwater? For this last question, I know the resistive force and the mass but I only have the projection speed of the object (10m/s) and I need to find the acceleration using F=ma (I think). Is there any way of calculating the resultant force with the acceleration unknown and the upwards force unknown in terms of newtons?
Trying not to burden you again, but does gravity act on an object moving upwards underwater? For this last question, I know the resistive force and the mass but I only have the projection speed of the object (10m/s) and I need to find the acceleration using F=ma (I think). Is there any way of calculating the resultant force with the acceleration unknown and the upwards force unknown in terms of newtons?
Trying not to burden you again, but does gravity act on an object moving upwards underwater? For this last question, I know the resistive force and the mass but I only have the projection speed of the object (10m/s) and I need to find the acceleration using F=ma (I think). Is there any way of calculating the resultant force with the acceleration unknown and the upwards force unknown in terms of newtons?
For the question, I'd say it would. What's the full question though?