Two postal delivery workers have different routes. They both travel from the post office, to neighborhoods to deliver mail, and then back to the post office. Which statement must be true about the two postal delivery workers? (1 point)
• They each travel a distance of 0 miles.
• They have the same velocity.
• They travel the same distance.
• They each have a displacement of 0 miles.
Yeah so the anonymously asking the bot questions is utterly useless, I got an 8/19. Wow, useless. Here are the answers since I'm useful.
Question 1: They each have a displacement of 0 miles.
Question 2: They have the same speed but different velocities.
Question 3: He is going faster and in a different direction during the first 10 minutes than in the last 10 minutes.
Question 4: The object remains still.
Question 5: A force applied in the opposite direction with the same magnitude at the same time.
Question 6: The force needed to lift a chair.
Question 7: Yes, this is an example of a force because a force is a push or pull.
Question 8: A ball accelerates as it rolls down a hill.
Question 9: A force acting in the direction opposite the object's motion is removed from the object.
Question 10: An unbalanced force stops your foot but does not act on the rest of your body.
Question 11: The bowler should choose a ball with less mass or throw the ball with more force.
Question 12: A baseball player swinging a bat and hitting a baseball, causing the bat to shatter.
Question 13: The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.
Question 14: Essay question.
Question 15: Essay question.
Hope I was useful, have a nice day you guys, stay safe.
im posting the answers after i finsih these essay ones
dude you could atleast tell us a list of the answers after your done
The correct statement must be: They each have a displacement of 0 miles. This means that they end up back at the post office, which is their starting point, so their final position is the same as their initial position.
To determine which statement must be true about the two postal delivery workers, we need to understand the concepts of distance and displacement.
Distance refers to the total path traveled by an object, regardless of the direction. It is a scalar quantity and is always positive or zero.
Displacement, on the other hand, refers to the change in position of an object. It takes into account both the distance traveled and the direction. Displacement is a vector quantity and can be positive, negative, or zero.
In this scenario, both postal delivery workers start and end at the post office, which means their initial and final positions are the same. Therefore, we can determine the displacement by calculating the change in position between the start and end points.
Now, let's evaluate each statement:
1. They each travel a distance of 0 miles.
This statement cannot be true because the workers have to travel to the neighborhoods to deliver mail, so they would definitely cover a positive distance.
2. They have the same velocity.
Since velocity is a vector quantity that takes into account both the distance and direction of an object, we cannot conclude that they have the same velocity solely based on the given information about their routes.
3. They travel the same distance.
This statement must be true because both workers start and end at the post office. Therefore, they cover the same distance in total, regardless of the specific routes they take.
4. They each have a displacement of 0 miles.
This statement must also be true because both workers return to the post office, which means their displacement is zero. Displacement is the change in position, and since they end up at the same position they started from, the displacement is indeed zero.
Therefore, the correct statement is: They each have a displacement of 0 miles.
The statement that must be true about the two postal delivery workers is that they each have a displacement of 0 miles.
Matt is walking at 1.25 miles per hour to the east. Jaime is walking at 1.25 miles per hour to the south. Whigh statement describes the movement of Matt and Jaime? (1 point)
• They have different speeds and different velocities.
• They have the same speed and the same velocity.
• They have the same speed but different velocities.
• They have different speeds but the same velocity.
The correct statement that describes the movement of Matt and Jaime is: They have different speeds and different velocities.
Speed refers to how fast an object is moving and is a scalar quantity. In this case, both Matt and Jaime have the same speed of 1.25 miles per hour.
Velocity, on the other hand, takes into account both the speed and direction of an object's motion, making it a vector quantity. Matt is walking to the east, while Jaime is walking to the south. Since they are moving in different directions, their velocities are different.
Therefore, Matt and Jaime have different speeds and different velocities.
What does a horizontal line on a position-time graph indicate about the object? (1 point)
• The object has a position of zero.
• The object is accelerating.
• The object has a constant, nonzero velocity.
• The object remains still.
A horizontal line on a position-time graph indicates that the object has a constant, nonzero velocity.
In a position-time graph, the position is represented on the y-axis, and time is represented on the x-axis. A horizontal line indicates that the position of the object remains constant over time.
If the velocity is nonzero, it means that the object is moving at a constant speed in a particular direction. Therefore, a horizontal line on a position-time graph indicates that the object has a constant, nonzero velocity.
A force acts on an object. Which option describes an action that could prevent the object from moving? (1 point)
• a force applied in the opposite direction with the same magnitude at the same time
• a force applied in the opposite direction with a greater magnitude at the same time
• a force applied in the same direction with the same magnitude at the same time
• a force applied in the same direction with a greater magnitude at the same time
To prevent an object from moving when a force is applied, the force applied in the opposite direction with the same magnitude at the same time would be required.
According to Newton's first law of motion, an object at rest or in motion will remain in that state unless acted upon by an external force. If a force is applied in the opposite direction with the same magnitude, it will cancel out the original force, resulting in a net force of zero. This will cause the object to stay at rest and prevent it from moving.
On the other hand, if a force is applied in the opposite direction with a greater magnitude, it might overcome the original force and cause the object to move in the opposite direction. Similarly, if a force is applied in the same direction with the same or greater magnitude, it will accelerate the object and cause it to move.
Therefore, the statement that describes an action that could prevent the object from moving is: a force applied in the opposite direction with the same magnitude at the same time.
Which option is the force with the greatest magnitude? (1 point)
• the force needed to lift a textbook
• the force needed to lift a hairbrush
• the force needed to lift a chair
• the force needed to lift a pencil
To determine which force has the greatest magnitude, we need to consider the weight of the objects. The weight of an object is determined by the force of gravity acting upon it.
The force needed to lift an object is equal to its weight, which is given by the equation W = mg, where W is the weight, m is the mass, and g is the acceleration due to gravity.
Given the provided options, we can make an inference based on the relative masses of the objects:
- A textbook typically has greater mass compared to a hairbrush or a pencil, so the force needed to lift a textbook would likely have a greater magnitude than the force needed to lift a hairbrush or a pencil.
- A chair can have even greater mass compared to a textbook, so the force needed to lift a chair would likely have the greatest magnitude among the given options.
Therefore, the force with the greatest magnitude is likely the force needed to lift a chair.
A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force? (1 point)
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• Yes, this is an example of a force because a force is a push or pull.
• No, this is not an example of a force because a force pulls an object.
• No, this is not an example of a force because the box did not move.
• Yes, this is an example of a force because gravity is pulling the box down.
Yes, this is an example of a force because a force is a push or pull.
In this situation, despite the box not moving, a person is exerting a push force on the box in an attempt to make it move. The force exerted by the person is still considered a force, even if the box does not move. A force can be applied to an object without necessarily causing it to move or change its state of motion. Therefore, this is indeed an example of a force.
Which situation describes a non-contact force changing the speed of an object? (1 point)
• a drawer opening when a user pulls the handle
• a bicycle accelerating as the rider pedals more quickly
• a ball accelerating as it rolls down a hill
• a gust of wind blowing a leaf away
The situation that describes a non-contact force changing the speed of an object is: a gust of wind blowing a leaf away.
Non-contact forces do not require direct physical contact between objects to occur. In this scenario, the gust of wind is a non-contact force that is exerted on the leaf, changing its speed and causing it to move away.
On the other hand, the other options mentioned involve either contact forces or forces applied by the user to directly interact with the objects. For example, a drawer opening when a user pulls the handle involves a contact force being applied by the user, while a bicycle accelerating as the rider pedals more quickly involves the rider applying a force to the pedals to interact with the bicycle. Similarly, a ball accelerating as it rolls down a hill involves contact between the ball and the hill surface.
Therefore, the situation that involves a non-contact force changing the speed of an object is a gust of wind blowing a leaf away.
In which situation would the momentum of a moving object increase? (1 point)
• A force acting in the direction of the object's motion is removed from the object.
• Two forces of equal magnitude act on the object in opposite directions.
• A new force acts on the object, opposing the object's motion.
• A force acting in the direction opposite the object's motion is removed from the object.
The situation in which the momentum of a moving object would increase is when a force acting in the direction opposite the object's motion is removed from the object.
Momentum is a vector quantity defined as the product of an object's mass and its velocity. The momentum of an object changes when there is a net force acting on it, according to Newton's second law, F = ma, where F is the net force, m is the mass of the object, and a is the acceleration.
When a force acts in the direction opposite the object's motion, it causes deceleration or a decrease in speed. If this force is then removed from the object, an equal and opposite force is no longer acting on it, and as a result, the object can continue moving with the same velocity or even increase its velocity. The removal of this opposing force allows the object to experience less resistance and can cause its momentum to increase.
Therefore, the situation in which the momentum of a moving object would increase is when a force acting in the direction opposite the object's motion is removed from the object.
When you trip, your foot stops, but your body continues to move forward. Which statement best explains why this happens? (1 point)
• An unbalanced force pushes your body forward.
• Newton's Second Law of Motion pushes your body forward after your foot stops.
• The unbalanced force that stops your foot pulls your body forward.
• An unbalanced force stops your foot but does not act on the rest of your body.
The best statement that explains why your body continues to move forward when you trip is: An unbalanced force stops your foot but does not act on the rest of your body.
When you trip, your foot comes into contact with an obstacle or surface, causing an unbalanced force to act on it. This force stops the motion of your foot, causing it to come to a sudden halt. However, the rest of your body, which is not directly in contact with the obstacle or surface, is not affected by this unbalanced force. As a result, your body continues to move forward due to its inertia.
According to Newton's first law of motion (the law of inertia), an object at rest or in motion will remain in that state unless acted upon by an external force. In this case, the unbalanced force that stops your foot is not acting upon the rest of your body, allowing it to continue moving forward.
Therefore, the statement that best explains why your body continues to move forward when you trip is that an unbalanced force stops your foot but does not act on the rest of your body.
A bowler throws a ball down the lane toward the pins. The ball reaches the pins and slowly moves through them, knocking down the center pins but leaving the end pins standing. The bowler wants the ball to reach all the pins. Which changes should the bowler make so that the ball has a greater acceleration? (1 point)
• The bowler should choose a ball with more mass or throw the ball with less force.
• The bowler should choose a ball with less mass or throw the ball with less force.
• The bowler should choose a ball with less mass or throw the ball with more force.
• The bowler should choose a ball with more mass or throw the ball with more force.
The bowler should choose a ball with less mass or throw the ball with more force in order to have a greater acceleration.
Acceleration is determined by the ratio of the net force acting on an object to its mass, according to Newton's second law, F = ma, where F is the net force, m is the mass, and a is the acceleration.
In this scenario, the bowler wants the ball to have a greater acceleration to ensure it reaches all the pins. By choosing a ball with less mass or throwing the ball with more force, the net force acting on the ball can be increased for a given mass. As a result, the acceleration of the ball will be greater.
If the bowler chooses a ball with more mass or throws the ball with less force, the net force acting on the ball will be smaller for a given mass. This would result in a lower acceleration and may not be sufficient to reach all the pins.
Therefore, the bowler should choose a ball with less mass or throw the ball with more force to have a greater acceleration and increase the chances of reaching all the pins.
In which situation does the reactive force between two colliding objects cause a physical change? (1 point)
• two bumper cars at an amusement park colliding, causing both cars to change direction
• a swing hitting another swing, causing the second swing to move away
• the exhaust from a rocket thrusting the rocket away from the ground
• a baseball player swinging a bat and hitting a baseball, causing the bat to shatter
The situation in which the reactive force between two colliding objects causes a physical change is: two bumper cars at an amusement park colliding, causing both cars to change direction.
When two bumper cars collide, there is a reactive force between them that occurs due to Newton's third law of motion, which states that every action has an equal and opposite reaction. The force exerted by one bumper car on the other bumper car is matched by an equal and opposite force exerted by the second bumper car on the first car.
In this scenario, the reactive force causes both cars to change their direction of motion. The force from the collision leads to a redirection of momentum, resulting in a change in the motion of each car. This physical change is observed as the cars deviating from their initial paths and moving in new directions after the collision.
In the other options mentioned:
- A swing hitting another swing may cause the second swing to move away, but this is due to the transfer of momentum and not a direct reactive force causing a physical change.
- The exhaust from a rocket thrusting the rocket away from the ground is a result of the expulsion of gas and the principles of Newton's third law, but it is not a reactive force between two colliding objects.
- A baseball player swinging a bat and hitting a baseball may shatter the bat, but this is due to the impact force between the bat and the ball and not a reactive force between colliding objects.
Therefore, the situation where the reactive force between two colliding objects causes a physical change is when two bumper cars at an amusement park collide, causing both cars to change direction.
A sledgehammer is swung at a wall. Once the sledgehammer hits the wall it does not breakthrough. How do the hammer and the wall act on each other? (1 point)
• The hammer and the wall exert forces on each other that are equal in magnitude and in the same direction.
• The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.
• The hammer exerts a stronger force than the wall but in the same direction.
• The hammer exerts a stronger force than the wall but in the opposite direction.
The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.
According to Newton's third law of motion, for every action, there is an equal and opposite reaction. When the sledgehammer hits the wall, it exerts a force on the wall, and in turn, the wall exerts an equal and opposite force on the hammer.
In this scenario, the force exerted by the hammer on the wall has the same magnitude as the force exerted by the wall on the hammer. However, the forces are in opposite directions, with the hammer exerting a force towards the wall and the wall exerting a force towards the hammer.
This interaction of equal and opposite forces allows objects to push against each other without breaking through or losing their shape. In the case of the sledgehammer hitting the wall, the forces between the two objects prevent the hammer from breaking through the wall.
Therefore, the correct statement is: The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.