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votes
3answers
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....
2
votes
1answer
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 ...
0
votes
1answer
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(\...
-2
votes
1answer
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.
2
votes
4answers
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 ...
1
vote
2answers
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 ...
0
votes
1answer
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". ...
0
votes
1answer
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 ...
6
votes
3answers
5k views

Is Torricelli's law “wrong” for big holes? - Tank draining problem

Consider a tank full of water with a constant cross-sectional area A1 placed vertically on the ground. Now someone drills a hole of an area A2 in the bottom of the tank, and the liquid starts escaping ...
1
vote
1answer
125 views

Why does a difference in approach to projectile motion yields different results?

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 ...