# Tagged Questions

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### Need some help with an easy mechanics question.

The distance between a boy and the shelf is R. He wants to throw a ball of mass m with an initial speed v such that it hits the top of the shelf of a height h. 1) Show that a ball thrown at the ...
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### My equations are inconsistent. Could someone help me see the error of my ways?

I'm given the following problem: Now, the following is my attempt at a solution: I have two problems: (1) With my equation for $v$, I end up having to take the log of $0$, which is obviously ...
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### Help with basic trigonometric (Physics) problem

I am re-learning basic Physics and I would like to know if I followed the correct steps, so I can continue doing more exercises. The problem says: "A person kicks a ball from the surface of a playing ...
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### Finding angles of two vectors using simultaneous equations

In a physics problem, I am asked to find the resulting angle of two velocity vectors using each velocity vector's components. For the x-component, I have $m_av_{1ax} = m_av_{2ax} + m_bv_{2bx}$. ...
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### Calculating time of flight of object (Mechanics - horizontal elevated launch)

I need help with the following question: A smooth spherical object is projected horizontally from a point of vertical height H = 25.78 metres above horizontal ground with a launch speed of u = ...
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### Calculating initial velocity (horizontal launch)

I need help for the following question: In a long jump event, an athlete jumps a horizontal distance of 7.56m. The athlete was airborne for 3.04 seconds. The acceleration due to gravity is taken as ...
### Physical System for $x'(t)=\sin (x(t))$
I'm asked to find a system that is modeled (or at least approximated) by $x'(t)=\sin (x(t))$ Differentiate yields $x''(t)=\cos (x(t)) \sin (x(t))$ and integrating (care of Wolfram Alpha ) ...
A particle moving with simple harmonic motion starts from rest at a distance $3m$ from the center of oscillation. If the period is 2$\pi$ seconds: a) Find the time taken to move to a point $2m$ ...