# All Questions

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44 views

### Finding the equations of motion with observations

Let's say that we don't know the equations of motion. I will try to predict where my ball will fall when I shoot it with an angle $\alpha$ and and speed $v$ by finding the function that describe this....
68 views

### Can the jerk diverge?

In other words can the acceleration change instantly? In direction and/or magnitude. There are two aspects to this question. In a problem, can you treat acceleration as changing instantly? (when in ...
89 views

### Approximating equation of motion with polynomial [closed]

I have set up these equations for a projectile in a game: \begin{align} y(t) &= 100 (-(0.99)^t (v \sin(\theta) + 100 g) + v \sin(\theta) + g (-t) + 100 g)\\ x(t) &= -100 (0.99^t - 1) v \cos(\...
39 views

### Special Relativity, Kinetics - Momentum and velocity [closed]

Suppose $\bar{p} = \frac {v}{1-\frac 23 v^2}$; show that $\bar{p} = {v} { (1+\frac 23 v^2+･･･)\approx v }$ when v is small.
280 views

### Velocity between two running animals

One animal $A$ can run $100$ km/h and another animal $B$ can run $85$ km/h. Suppose the slower animal $B$ starts running $25$ meters ahead of the faster animal $A$ in a direction. How can I ...
933 views

### Point object, Kinematics

I am very new to physics. This evening, I was reading about the concept of objects to be considered as point objects under some circumstances. And I was trying to think of circumstances under which ...
284 views

### Why is drag neglected while dealing with kinematic problems?

Why is drag neglected while dealing with kinematic problems? While dealing with problems related to finding velocity, acceleration and other kinematic problems, it is mentioned to "neglect drag". ...
325 views

### Explain how $\Delta v_{\perp}=v\Delta\theta$

In The Feynman lectures, under the chapter entitled Vectors, Feynman writes: My two intimately related questions are: 1) What does he mean by the magnitude of velocity? is he talking about the ...
A body is projected vertically upwards from the surface of the earth with a velocity equal to half the escape velocity. If $R$ is the radius of the earth, then find the maximum height attained by the ...