A particle's velocity is described by the function vₓ =kt² m/s, where k is a constant and t is in s. The particle's position at t₀ = 0 s is x₀ = -9.0 m. At t₁ = 3.0 s, the particle is at x₁ = 9.0 m. Determine the value of the constant k. Be sure to include the proper units.

검증된 단계별 안내

Step 1: Understand the relationship between velocity and position. Velocity is the derivative of position with respect to time. To find the position function x(t), integrate the given velocity function vₓ = k t² with respect to time.

Step 2: Perform the integration of vₓ = k t². The integral of k t² with respect to t is (k/3) t³ + C, where C is the constant of integration. This gives the position function x(t) = (k/3) t³ + C.

Step 3: Use the initial condition x₀ = -9.0 m at t₀ = 0 s to solve for the constant of integration C. Substituting t = 0 and x = -9.0 into the position function, we find C = -9.0 m.

Step 4: Substitute the known position x₁ = 9.0 m at t₁ = 3.0 s into the position function x(t) = (k/3) t³ - 9.0 to solve for k. Plugging in t = 3.0 s and x = 9.0 m, the equation becomes 9.0 = (k/3) (3.0)³ - 9.0.

Step 5: Rearrange the equation from Step 4 to isolate k. Solve for k by simplifying the terms and ensuring the units are consistent. The final value of k will have units of m/s³.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Velocity and Position Relationship

Velocity is the rate of change of position with respect to time. In this problem, the velocity function vₓ = kt² indicates that the velocity changes with the square of time. To find the position of the particle, we need to integrate the velocity function over time, which will give us the position function. Understanding this relationship is crucial for solving the problem.

Integration of Velocity to Find Position

To determine the position of a particle from its velocity function, we perform integration. The integral of the velocity function vₓ = kt² with respect to time t will yield the position function x(t). This process involves applying the fundamental theorem of calculus, which connects differentiation and integration, allowing us to find the position at any given time.

Initial and Final Conditions

Initial and final conditions are essential for solving problems in physics, as they provide specific values that help determine unknown constants. In this case, the initial position x₀ at t₀ = 0 s and the final position x₁ at t₁ = 3.0 s are given. These conditions will be used to solve for the constant k by substituting the known values into the position function derived from the integrated velocity.