/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 78 A 292-kg motorcycle is accelerat... [FREE SOLUTION] | 91Ó°ÊÓ

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A 292-kg motorcycle is accelerating up along a ramp that is inclined \(30.0^{\circ}\) above the horizontal. The propulsion force pushing the motorcycle up the ramp is \(3150 \mathrm{N},\) and air resistance produces a force of 250 \(\mathrm{N}\) that opposes the motion. Find the magnitude of the motorcycle's acceleration.

Short Answer

Expert verified
The motorcycle's acceleration is approximately 5.03 m/s².

Step by step solution

01

Find the Component of Gravitational Force Parallel to the Ramp

To find the component of the gravitational force that acts parallel to the ramp, use the formula: \( F_{\text{gravity, parallel}} = mg\sin(\theta) \). Here, \( m = 292 \text{ kg} \), \( g = 9.8 \text{ m/s}^2 \), and \( \theta = 30.0^\circ \). Calculating gives: \( F_{\text{gravity, parallel}} = 292 \times 9.8 \times \sin(30.0^\circ) = 1431.6 \text{ N} \).
02

Calculate the Net Force Acting on the Motorcycle

The net force is found by subtracting both the gravitational force component parallel to the ramp and the force of air resistance from the propulsion force. Thus: \( F_{\text{net}} = F_{\text{propulsion}} - F_{\text{gravity, parallel}} - F_{\text{air resist}} \). Plug in the values: \( F_{\text{net}} = 3150 \text{ N} - 1431.6 \text{ N} - 250 \text{ N} = 1468.4 \text{ N} \).
03

Calculate the Acceleration of the Motorcycle

Use Newton's second law, \( F = ma \), to find the acceleration, \( a \). Rearrange the formula to solve for \( a \): \( a = \frac{F_{\text{net}}}{m} \). Substituting the known values gives: \( a = \frac{1468.4}{292} = 5.03 \text{ m/s}^2 \).

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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 serves as a cornerstone of classical physics, offering a guideline to determine how force affects motion. According to this law, the net force acting on an object is equal to the mass of the object multiplied by its acceleration: \[ F = ma \].

This relationship shows how both the net force and mass determine the acceleration of an object.
For our motorcycle, once we calculate the net force acting upon it, we can easily find its acceleration.
The equation can be rearranged to solve for acceleration, which is commonly used in physics problems: \[ a = \frac{F}{m} \].

Understanding this law aids in assessing and predicting the motion of any object, provided you know the forces acting on it and its mass.
Force Components
Force components are crucial in physics as they allow us to analyze forces acting in different directions. When dealing with forces on an incline, such as our motorcycle on the ramp, it's often helpful to break down the forces into parallel and perpendicular components relative to the surface.

For example:
  • The gravitational force can be decomposed into components parallel and perpendicular to the ramp.
  • We usually use trigonometric functions like sine and cosine to find these components.
  • In the problem, we found the component of gravitational force parallel to the ramp using \( F_{\text{gravity, parallel}} = mg\sin(\theta) \).

By understanding force components, solving problems involving inclined planes becomes much simpler and more manageable, providing clearer insights into how forces interact.
Inclined Planes
Inclined planes are a common feature in physics problems and involve understanding how angles affect force and motion. They provide a way to analyze the motion of objects on slopes, allowing us to utilize concepts like friction, gravitational force, and net force.

When an object is on an inclined plane:
  • The gravitational force is split into components along and perpendicular to the plane.
  • This means each component affects the object's motion slightly differently.
  • Analyzing these components helps in understanding how the object will move along the incline.

The critical angle of the plane, in our case \(30.0^\circ\), plays a significant role in determining the force components and how they influence motion.
Gravitational Force
Gravitational force is the attractive pull that the Earth exerts on objects. It is calculated with the formula \( F_g = mg \), where \( m \) is the mass and \( g \) is the acceleration due to gravity, approximately \(9.8 \text{ m/s}^2\) on Earth's surface.

Understanding gravitational force components is vital in physics:
  • On inclined planes, we often discuss the component of the gravitational force acting parallel to the slope.
  • This component impacts how much force is needed to move an object up the slope.
  • For the motorcycle, calculating the parallel component helps us establish how much the gravitational force is working against the propulsion force.

This knowledge is indispensable when analyzing motion, ensuring that every force is accounted for accurately in any calculation or prediction of movement.
Net Force Calculations
Calculating the net force is the sum of all forces acting on an object and is crucial for predicting motion. The net force is the unbalanced force that remains after factoring in all opposing forces.

For the motorcycle:
  • We determine net force by subtracting the gravitational component and air resistance from the propulsion force.
  • This calculation involves understanding both the magnitude and direction of each force involved.
  • The equation used is: \[ F_{\text{net}} = F_{\text{propulsion}} - F_{\text{gravity, parallel}} - F_{\text{air resist}} \]

Performing accurate net force calculations helps in determining whether an object will accelerate, decelerate, or remain at a constant velocity, thereby giving insight into the dynamic conditions of the system.

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Most popular questions from this chapter

A small sphere is hung by a string from the ceiling of a van. When the van is stationary, the sphere hangs vertically. However, when the van accelerates, the sphere swings backward so that the string makes an angle of \(\theta\) with respect to the vertical. (a) Derive an expression for the magnitude \(a\) of the acceleration of the van in terms of the angle \(\theta\) and the magnitude \(g\) of the acceleration due to gravity. (b) Find the acceleration of the van when \(\theta=10.0^{\circ} . \quad(\mathrm{c})\) What is the angle \(\theta\) when the van moves with a constant velocity?

ssm At an airport, luggage is unloaded from a plane into the three cars of a luggage carrier, as the drawing shows. The acceleration of the carrier is 0.12 \(\mathrm{m} / \mathrm{s}^{2}\), and friction is negligible. The coupling bars have negligible mass. By how much would the tension in each of the coupling bars \(A\), \(B\), and \(C\) change if 39 \(\mathrm{kg}\) of luggage were removed from car 2 and placed in (a) car 1 and (b) car 3? If the tension changes, specify whether it increases or decreases.

ssm A person in a kayak starts paddling, and it accelerates from 0 to 0.60 m/s in a distance of 0.41 m. If the combined mass of the person and the kayak is 73 kg, what is the magnitude of the net force acting on the kayak?

ssm A bowling ball (mass \(=7.2 \mathrm{kg},\) radius \(=0.11 \mathrm{m} )\) and a billiard ball (mass \(=0.38 \mathrm{kg},\) radius \(=0.028 \mathrm{m}\) ) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?

A person with a black belt in karate has a fist that has a mass of 0.70 \(\mathrm{kg}\) . Starting from rest, this fist attains a velocity of 8.0 \(\mathrm{m} / \mathrm{s}\) in 0.15 \(\mathrm{s}\) . What is the magnitude of the average net force applied to the fist to achieve this level of performance?

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