Solving for the Velocity and Height in a Difficult Kinematics Problem

In summary, a ball is thrown leftward from a roof at height h and hits the ground 1.07 seconds later at a distance of 27.5 meters and an angle of 67° with the horizontal. To solve for h, one could make a list of variables and use kinematic equations to solve for the unknown variables. The velocity at which the ball is thrown can be found by using the magnitude of the final velocity in the x and y directions, which can also be solved for using kinematics.
  • #1
cwheats
3
0

Homework Statement


In the figure, a ball is thrown leftward from the left edge of the roof, at height h above the ground. The ball hits the ground 1.07 s. later, at distance d = 27.5 m from the building and at angle θ = 67° with the horizontal.

4-36.gif


(a) Find h

(b) What is the velocity at which the ball is thrown?
magnitude
angle ° relative to the horizontal

(c) Is that angle above or below the horizontal?


Homework Equations





The Attempt at a Solution



Ive been staring at this problem for a while now and am out of ideas any help would be greatly appreciated.
 
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  • #2
Did you try making a list of Δt, Δ(x or y), Vi, Vf, and a for both the x and the y directions, then seeing if you can apply a kinematic equation to solve for unknown variables?

For instance Vfy =sin67(magnitude of Vf) and Vfx = cos67(magnitude of Vf), so if you could use kinematics in one direction to solve for the magnitude of Vf, you would then know the final velocity in the other direction as well.
 

Related to Solving for the Velocity and Height in a Difficult Kinematics Problem

What is a difficult kinematics problem?

A difficult kinematics problem is a type of physics problem that involves analyzing the motion of objects and calculating their position, velocity, and acceleration at different points in time. These problems often require the use of complex mathematical equations and can be challenging to solve.

Why are kinematics problems considered difficult?

Kinematics problems can be considered difficult because they often involve multiple variables, complex equations, and require a strong understanding of physics concepts. They also require a systematic approach and precision in calculations, which can be daunting for many people.

How do I approach a difficult kinematics problem?

To approach a difficult kinematics problem, it is important to first identify the given values and what needs to be solved for. Then, use the appropriate equations and consistently track units to ensure accurate calculations. It is also helpful to draw diagrams and visualize the problem to better understand the motion of the objects involved.

What are some tips for solving difficult kinematics problems?

Some tips for solving difficult kinematics problems include breaking down the problem into smaller, more manageable parts, using the correct equations and formulas, paying attention to units, and double-checking calculations for accuracy. It can also be helpful to practice solving similar problems to build problem-solving skills.

What are some common mistakes to avoid when solving difficult kinematics problems?

Common mistakes to avoid when solving difficult kinematics problems include using incorrect equations, not considering all given information, making calculation errors, and not paying attention to units. It is also important to check for extraneous solutions and to have a clear understanding of the problem before attempting to solve it.

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