# Questions tagged [homework-and-exercises]

Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.

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### Why is the probability of a cat catching a mouse 100%？

On a one-dimensional number axis, there is a mouse at the origin O and a cat at x=1. The cat can press 1 to the left or right to move one space at a time with a probability of 1/2, respectively. It is ...
12 views

### Anomalous calculation about stellar collision

Suppose two bodies of mass $m$, one of them is fixed and the another is free to move,they are separated by a distance $l$ initially and the system is at rest. What would be the speed of the free body ...
33 views

### Kinematics constant acceleration problem

A stone is being thrown vertically upward with a speed of 12.5m/s from the edge of a cliff 75.0m high, what’s the total distance did it travel? It is a constant acceleration kinematics problem, I ...
1 vote
16 views

### Octopus Ride how much +G force in upward Jerk?

This is a version of the Octopus Ride here: https://www.youtube.com/watch?v=8flmhIAKTvQ They call it Hip Hop but really it is what you call it in other places, I felt my left Butt Cheek or Thigh cramp ...
12 views

### Kelvin–Helmholtz instabilities - how to solve these questions? [closed]

The Kelvin-Helmholtz problem occurs when horizontal wind and density change at a discontinuity with $U_1,ρ_1$ in the upper layer and $U_2,ρ_2$ in a lower layer. It can be shown that the phase speed ...
10 views

### About pressure and density [closed]

The diagram is a U tube that consisted with 3 immiscible liquids . i) Calculate the pressure exerted on point Q by the water column. ii)What is pressure exerted on P? iii)Calculate density of liquid X....
41 views

1 vote
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### Magnetic dipole moment due to folded loop [closed]

A steady current i flows in a small square loop of wire of side L in a horizontal plane. The loop is now folded about its middle such that half of it lies in a vertical plane. Let $μ_1$ and $μ_2$ ...
70 views