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Beginning from rest, an object of mass \(100 \mathrm{~kg}\) slides down a 12 -m-long ramp. The ramp is inclined at an angle of \(30^{\circ}\) from the horizontal. If air resistance and friction between. the object and the ramp are negligible, determine the velocity of the object, in \(\mathrm{m} / \mathrm{s}\), at the bottom of the ramp. Let \(g=9.81 \mathrm{~m} / \mathrm{s}^{2}\)

Short Answer

Expert verified
The velocity of the object at the bottom of the ramp is approximately 10.85 m/s.

Step by step solution

01

- Identify the Forces

First, identify the forces acting on the object. These are gravity and the normal force. Since friction and air resistance are negligible, only the component of gravity parallel to the ramp will accelerate the object.
02

- Calculate the Gravitational Force Component

Calculate the component of the gravitational force parallel to the ramp: \( F_{parallel} = mg \sin(\theta) \) where \( m = 100 \text{ kg} \), \( g = 9.81 \text{ m/s}^2 \), and \( \theta = 30^{\circ} \).
03

- Write the Equation of Motion

Using Newton's second law, the net force equals mass times acceleration: \( F_{parallel} = ma \) Solving for acceleration (\(a\)) gives: \( a = g \sin(\theta) \). Substitute the values: \( a = 9.81 \sin(30^{\circ}) \approx 4.905 \text{ m/s}^2 \).
04

- Use Kinematic Equation

Since the object starts from rest (initial velocity \( u = 0 \)), apply the kinematic equation: \( v^2 = u^2 + 2as \) where \( v \) is the final velocity, \( u = 0 \), \( a = 4.905 \text{ m/s}^2 \), and \( s = 12 \text{ m} \).
05

- Solve for Final Velocity

Substitute the given values into the kinematic equation: \( v^2 = 0 + 2(4.905)(12) \) \( v^2 = 117.72 \) Thus: \( v = \sqrt{117.72} \approx 10.85 \text{ m/s} \).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Newton's second law
Newton's second law of motion states that the acceleration of an object depends on the net force acting on it and its mass. The mathematical expression for this law is: \[ F = ma \] where \( F \) is the net force, \( m \) is the mass, and \( a \) is the acceleration. In our problem, we are mainly concerned with the gravitational force acting along the inclined ramp. This force impacts the object's acceleration down the ramp. Identifying and understanding this force is crucial to solving for the object's final velocity. By evaluating the forces that act parallel to the ramp (\( F_{parallel} = mg \sin(\theta) \)), we can determine the net force and understand how it drives the object's motion. Once we have this force, we can use it to solve for acceleration: \[ a = g \sin(\theta) \] Gain a solid foundation of Newton's second law to tackle various physics problems efficiently.
Kinematic equations
Kinematic equations describe the motion of objects without considering the causes of this motion. They are beneficial for calculating the final velocity, displacement, time, and acceleration when an object moves with constant acceleration. The specific kinematic equation used in the problem is: \[ v^2 = u^2 + 2as \] Here, \( v \) represents the final velocity, \( u \) is the initial velocity, \( a \) stands for acceleration, and \( s \) is the displacement. First, since the object starts from rest, its initial velocity \( u \) is zero. This simplifies our equation to: \[ v^2 = 2as \] Substituting the object's acceleration and the distance it travels down the ramp into the equation allows us to solve for the final velocity. Kinematic equations are powerful tools for analyzing linear motion, especially when initial conditions and constant acceleration are involved.
Gravitational force
Gravitational force is the attractive force that exists between any two masses. On Earth's surface, this force accelerates objects downward at a rate of \( 9.81 \text{ m/s}^2 \). In our problem, the gravitational force must be decomposed into components to analyze the object's motion down the ramp. The gravitational force component parallel to the ramp's surface is given by: \[ F_{parallel} = mg \sin(\theta) \] Where \( m \) is the object's mass, \( g \) is the gravitational acceleration, and \( \theta \) is the incline angle. This parallel component is crucial as it is the force that induces acceleration along the ramp. Understanding how to resolve gravitational force into components is essential for analyzing motion on inclined planes. This knowledge is applicable in numerous physics scenarios, including mechanics and celestial motion.

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