Hi all, me with a few physics problems.

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SUMMARY

The forum discussion revolves around solving three physics problems involving kinematics and forces. The first problem requires calculating the speed of a dirt bike rider needed to land 2.5 meters beyond a jump over three hills, with a takeoff angle of 37 degrees. The second problem assesses whether a paratrooper will black out under specific forces during a parachute deployment. The third problem involves determining the tension in cables supporting a 100 kg camera at a 45-degree angle. Participants emphasize the importance of understanding kinematic equations, specifically the SUVAT equations, to approach these problems effectively.

PREREQUISITES
  • Understanding of kinematic equations (SUVAT equations)
  • Basic knowledge of forces and Newton's laws
  • Familiarity with trigonometric functions (sine, cosine)
  • Concept of vertical and horizontal motion components
NEXT STEPS
  • Study kinematic equations in detail, focusing on their applications in projectile motion
  • Learn about free body diagrams to analyze forces acting on objects
  • Explore the concept of acceleration due to gravity (g = 9.8 m/s²) and its implications in motion
  • Investigate tension in cables and how to calculate it using equilibrium conditions
USEFUL FOR

Students studying physics, particularly those tackling kinematics and forces, as well as educators looking for examples of problem-solving techniques in physics discussions.

  • #31
Hootenanny said:
Correct, so using vf = vi+at we can write;

v -gt = 0 \Rightarrow t = -\frac{v}{g}

Do you follow?


okay yea, I follow.
 
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  • #32
So, when the rider lands what will his vertical velocity be?
 
  • #33
Hootenanny said:
So, when the rider lands what will his vertical velocity be?

I'm sorry, I don't know. It seems like we're going in circles. I'm looking at this stuff and d is the only number I have. Everything else is equal to other thigns I don't know. Like T, I understand that t = -v/g, but how do I get v? is g just 9.8?
 
  • #34
Anyone else care to help on a different problem?
 

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