A friend of mine asked about this problem and I'm wondering if anyone has any advice or tips how to solve it.
1. The problem statement.
(picture attached)
Two bars L1 and L3, connected to two walls, can turn around their fixed wall positions. Torques in those points M1 and M3. The bars are...
Thanks and right, exactly. I got that far, and then...
When sand leave drum A, it doesn't exert any torque on drum A and drum A doesn't exert and torque on the rest of the system. If no forces act on the drum it will keep on spinning about the same angular velocity. (Newton.1)
Is this enough...
Homework Statement
A drum of mass MA and radius a rotates freely with initial angular velocity ωA(0). A second drum with mass MB and radius b > a is mounted on the same axis and is at rest, although it is free to rotate. A thin layer of sand with mass Ms is distributed on the inner surface of...
Could it be because the fridge is working to cool down the air inside and because of the fact that it is rather well-closed there has to be a certain pressure difference before air can slip in.
Yes true, but I got hooked up on the fact that the air inside the fridge before opening the door is a lot cooler than the outside, but the door is easy to open.
Therefore my idea is that when you shut the door (usually with a slam) the door is "tighter" and preserves the mass, volume variables...
When opening a refrigerator door, the cold air inside mix with the warmer air outside. Directly after closing the door, it is noticably harder to open it again. Does anyone know how these temperature changes affect the pressure difference and exactly why?
Thank you.
Oh ok, thanks for your reply.
An example of how I misinterpreted the given information. Thought the 5 percent of its weight was somehow 5 percent of its weight against the normal to the hill.
Taken from An introduction to mechanics - Kleppner, Kolenkow.
Problem 4.17
Homework Statement
A snowmobile climbs a hill at 15 mi/hr. The hill has a grade of 1 ft rise for every 40 ft. The resistive force due to the snow is 5 percent of the vehicle's weight. How fast will the snowmobile...