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Ch 03: Motion in Two or Three Dimensions
Young & Freedman Calc - University Physics 14th Edition
Young & Freedman Calc14th EditionUniversity PhysicsISBN: 9780321973610당신이 사용하는 게 아니라요?교과서 변경
3장, 문제 22a

A 124 kg balloon carrying a 22 kg basket is descending with a constant downward velocity of 20.0 m/s. A 1.0 kg stone is thrown from the basket with an initial velocity of 15.0 m/s perpendicular to the path of the descending balloon, as measured relative to a person at rest in the basket. That person sees the stone hit the ground 5.00 s after it was thrown. Assume that the balloon continues its downward descent with the same constant speed of 20.0 m/s. How high is the balloon when the rock is thrown?

검증된 단계별 안내
1
Identify the initial conditions: The balloon and basket have a combined mass of 146 kg and are descending at a constant velocity of 20.0 m/s. The stone is thrown with an initial velocity of 15.0 m/s perpendicular to the descent path.
Determine the vertical motion of the stone: Since the stone is thrown perpendicular to the descent, its initial vertical velocity is the same as the balloon's descent velocity, which is 20.0 m/s downward.
Use the kinematic equation for vertical motion to find the height: The stone hits the ground 5.00 s after being thrown. Use the equation for vertical displacement: y=vit+12gt^2, where vi is the initial vertical velocity, t is the time, and g is the acceleration due to gravity (approximately 9.81 m/s²).
Substitute the known values into the equation: y=-20.05.00+129.815.00^2. Note that the initial velocity is negative because it is downward.
Calculate the vertical displacement: Solve the equation to find the height from which the stone was thrown, which is the initial height of the balloon when the rock is thrown.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
5m
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주요 개념

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

Relative Velocity

Relative velocity is the velocity of an object as observed from a particular frame of reference. In this problem, the stone's velocity is given relative to the basket, which is itself moving downward. Understanding how to calculate the stone's velocity relative to the ground requires combining its velocity with the balloon's constant descent velocity.
추천 영상:
가이드 코스
04:27
Intro to Relative Motion (Relative Velocity)

Projectile Motion

Projectile motion involves the motion of an object thrown into the air, subject to gravitational acceleration. The stone is thrown with an initial horizontal velocity and falls under gravity, making its path a parabola. Calculating the stone's vertical displacement over time helps determine the height from which it was thrown.
추천 영상:
가이드 코스
04:44
Introduction to Projectile Motion

Kinematic Equations

Kinematic equations describe the motion of objects under constant acceleration, such as gravity. These equations can be used to calculate the stone's vertical displacement over time, given its initial velocity and the time it takes to hit the ground. This is crucial for determining the balloon's height when the stone is thrown.
추천 영상:
가이드 코스
08:25
Kinematics Equations
관련 실천
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