The displacement is zero.
Hence, the correct option is B.
The displacement of an object is the change in its position.
In this case, the runner starts and ends at the same point, so the displacement is zero.
Even though the runner runs 800 meters (2 laps x 400 meters/lap), the runner does not change position.
The runner ends up where they started, so the displacement is zero.
Therefore, The displacement is zero.
Hence, the correct option is B.
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A 2.9 kg model rocket accelerates at 15.3 m/s2 with a force of 44 N. Before launch, the model rocket was not moving. After the solid rocket engine ignited, hot gases were pushed out from the rocket engine nozzle and propelled the rocket toward the sky. Which of Newton’s laws apply in this example? Check all that apply.
A the first law
B the second law
C the third law
D the fourth law
E the fifth law
Answer:
A the first law
B the second law
C the third law
Explanation:
All three Newton laws are involved in this example. Let's see why:
1) First Law: "an object which has a zero net force acting on it stays at rest if it was at rest or continue to move at constant speed if it was already moving" --> this law applies to the first part of the problem, before the launch, when the rocket is not moving: since no forces are acting on it, it stays at rest.
2) Second law: "a net force F applied to an object of mass produces an acceleration a given by the relationship:
[tex]F=ma[/tex]"
This law applies when the rockets starts its motion: in fact, a force of 44 N is applied to the rocket of mass 2.9 kg, and its acceleration is a=15.3 m/s^2, and we see that these numbers satisfy the previous equation.
3) Third law: "when an object A exerts a force on object B, object B exerts an equal and opposite force on object A"
This law applies when the rocket is in motion: in fact, the rocket pushes the hot gases outside, so the hot gases pushes back on the rocket, accelerating it so it moves forward.
Which statement below is false? A) Weight depends on the force of gravity. B) Mass is the amount of matter in an object. C) Mass is a constant no matter where you are located. D) Weight is a constant no matter where you are located.
The false statement is "Weight is a constant no matter where you are located." The correct option is D.
A) Weight depends on the force of gravity: This statement is true. Weight is the force with which an object is pulled toward the center of the Earth (or any other celestial body) due to gravity. The weight of an object can vary depending on the strength of the gravitational field.
B) Mass is the amount of matter in an object: This statement is true. Mass is a measure of the amount of matter contained in an object. It is an intrinsic property and remains constant regardless of the location of the object.
C) Mass is a constant no matter where you are located: This statement is true. Mass is an intrinsic property of an object and is independent of its location. It represents the quantity of matter an object contains and does not change with location or gravitational field.
D) Weight is a constant no matter where you are located: This statement is false. Weight depends on the gravitational force acting on an object, which varies depending on the location. The weight of an object is equal to the mass of the object multiplied by the acceleration due to gravity at that location. Since the strength of gravity can vary from one location to another, the weight of an object will also vary accordingly. For example, an object will weigh less on the Moon compared to Earth due to the Moon's weaker gravitational pull.
Hence, The correct answer is option D.
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The coefficient of linear expansion of iron is 1.0 × 10−5 per C◦ . The surface area of an iron cube, with an edge length of 5.0 cm, will increase by what amount if it is heated from 10◦ C to 60◦ C?
Based on the linear expansion of iron, the increase in area is 0.15cm²
What is linear expansivity?Linear expansivity is the increase in length per unit length of a material for every degree rise in temperature.
The linear expansion of iron is α = 1 × 10⁻⁵/°C
Length edge of the iron cube is 5cm
the surface area of cube A = 6L²
Initial surface area = 6 * 5² = 150cm²
The edge length of cube, L₂ after being heated from
10°C to 60°C is calculated using the formula below:
L₂ = L[I + α*dt]where
α is the linear expansion of irondt is the temperature differencedt = 60-10 = 50°C
L₂ = 5(1 + 1 × 10⁻⁵ * 50)
5.0025cm
The surface area of the cube after heated A' is
A' = 6 * 5.0025²
A' = 150.1500375 cm²
The increased area, A' -A = (150 - 150.1500375) cm²
The increase in area is 0.15cm²
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After you rub a balloon on your hair it might stick to a wall. Why? Be specific.
as the balloon is rubbed on hair, due to friction, the electron transfer takes place between them and as a result balloon acquire some charge. The balloon when touched with the wall sticks to it because of force of attraction between balloon and wall. the wall must have the charge opposite to what the balloon has on it. we know that unlike charge attract hence the balloon sticks to the wall.
the gravitational force between two objects increase as the mass increases or distance decreases
the gravitational force between two objects increase as the mass increases or distance decreases
If you lift a 250 N weight 3 meters off of the ground, how much work have you done in joules?
what determines the path that an object in projectile motion follows
ANSWER:
C) Gravity & Inertia.
Choices
A) gravity only
B) inertia and air resistance
C) gravity and inertia
D) gravity and air resistance
The electric field between two parallel plates has a magnitude of 875 N/C. The positive plate is .002 m away from the negative plate. What is the electric potential difference between the plates?
The electric potential difference between two parallel plates with an electric field strength of 875 N/C and separated by 0.002 m is 1.75 volts.
The question asks about the electric potential difference between two parallel plates given the electric field magnitude. To find the electric potential difference (V) between the plates, we use the equation V = E × d, where E is the electric field strength and d is the distance between the plates.
In this case, the electric field (E) is 875 N/C, and the distance (d) is 0.002 m. Therefore, the electric potential difference is:
V = E × d = 875 N/C × 0.002 m = 1.75 V
The electric potential difference between the plates is 1.75 volts.
Please help! Just answer these questions
under normal conditions describe how increasing the temperature affects the solubility of a typical salt
In a closed circuit containing one resistor and a battery, if the voltage in the battery increases, the current going through the resistor increases. Why does this occur?
In a closed circuit there is a battery and resistor, from ohm's law if the voltage in the battery increases then the current in the resistor will also increase.
What is Ohm's law?The connection between current, voltage, and resistance is described by Ohm's law. The voltage or potential difference across numerous materials determines how much constant current flows through them. As a result, if the voltage V (measured in volts) across two ends of a wire made of one of these substances is tripled, the current I (measured in amps) also triples, and the ratio V/I stay the same.
The resistance, R, for a specific material is it's V/I ratio and is expressed in ohms. Over extremely wide voltage and current ranges, the resistance of substances for which Ohm's law is applicable remains constant. The mathematical model for Ohm's law is V/I = R.
Therefore, from the formula of ohm's law if the voltage in the circuit will increase then the current will also going to increase with it.
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the lowest pitch that the average human can hear has a frequency of 20.0 Hz. if sound with this frequency travels through air with a speed of 331 m/s what is it's wavelength?
The lowest pitch that the average human can hear has a frequency of 20.0 Hz. if sound with this frequency travels through air with a speed of 331 m/s it's wavelength is 16.55 m.
What is frequency?The number of vibrations counted per second is called frequency. A wave is a group of vibrations that are referred to as energy. The bottom node is known as the crest, and the top node is known as the trough.
λ = wave velocity/frequency
λ = 331 m/s / 20.0 Hz
λ = 16.55 m
The lowest pitch that the average human can hear has a frequency of 20.0 Hz. if sound with this frequency travels through air with a speed of 331 m/s it's wavelength is 16.55 m.
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Frieda, age 16, is a boating enthusiast who can tie 20 different kinds of knots. This type of knowledge is most aptly described as __________ knowledge.
How does energy travel?
1. In strings
2. In beams
3. In pulses
4. In waves
Can anyone define thermostat and list electrical appliances that have a thermostat?
A thermostat is a device that controls the temperature of a system by sensing changes in temperature and automatically adjusting the heating or cooling system. Various electrical appliances have thermostats to maintain a set temperature by turning on and off the heating or cooling elements as needed.
Explanation:A thermostat is a device that controls the temperature of a system by sensing changes in temperature and automatically adjusting the heating or cooling system. It helps maintain a set temperature by turning on and off the heating or cooling elements as needed.
There are many electrical appliances that have a thermostat, including:
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the SI unit for pressure is pascal (Pa). One hectopascal would equal how many pascals?
0.1 Pa
10 Pa
100 Pa
1000 Pa
Answer:
1 hectopascal = 100 Pascal
Explanation:
Pressure exerted by an object is defined as the force acting on it per unit area. Mathematically, it is given by :
[tex]pressure=\dfrac{force}{area}[/tex]
The SI unit of unit of pressure is pascal. It is equivalent to :
[tex]1\ Pa=N/m^2[/tex]
or
[tex]1\ Pa=kg\ m^{-1}s^{-2}[/tex]
1 hectopascal = 100 Pascal
So, one hectopascal equals 100 pa. Hence, the correct option is (c).
Why is Melanie's diagram of the phases of the moon incorrect? First quarter moon should be between the sun and Earth. Third quarter moon should be between the sun and Earth. The position of the full moon and new moon have been interchanged. The position of the first quarter moon and third quarter moon have been interchanged.
Which state(s) of matter have no definite shape or volume?
Answer: gaseous
Explanation:
The major states of matter are solid, gaseous, liquid and plasma. However, there numerous others continued to be discovered such as Bose-Einstein condensate due to continuous research.
Solid state of matter usually have shape and volume which is a major physical characteristic of solids, liquid state of matter do not have shape but have volume however, the tend to occupy the shape of the container with respect to their volume in the container. Gaseous state of matter do not shape or volume but just occupy space in the container.
How does the resistance change as you add bulbs to a series circuit? The resistance does not change. The resistance decreases. The resistance increases.
Answer:
The resistance increased
Explanation:
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If it takes light 26,000 years to travel from the Sun to the center of the Milky Way galaxy, how far is the Sun from the center of the Milky Way? 26,000 light-years 2,600 light-years 260 light-years 26 light-years
It's about 26,000 lightyears away from the galactic center.
a scientist wants to analyze signals from outer space. Her lab has sensors to dect sound waves, radio waves, and seismic waves. Which of these sensors will provide the best information?
Final answer:
The most suitable sensor for analyzing signals from outer space is radio wave sensors due to their economical production cost and efficiency in transmitting through interstellar space and atmospheres, thus providing valuable information about the sources of the waves.
Explanation:
In analyzing signals from outer space, the best sensor to use among sound waves, radio waves, and seismic waves would be radio wave sensors. Radio waves are the lowest-frequency and lowest-energy band of the electromagnetic spectrum, making them not only inexpensive to produce but also adept at traveling through interstellar dust, gas, and planetary atmospheres without significant absorption.
This capability is crucial for receiving unimpeded signals from space. The information collected through radio waves can reveal the chemistry and physical conditions of their sources. Moreover, radio waves are already extensively used in various communication systems on Earth. Therefore, in the context of SETI (Search for Extraterrestrial Intelligence) or any other form of cosmic study, radio waves are the most suitable and effective for gathering data from outer space.
What is the abbreviation for the SI unit for electric potential
Plants use a process called cellular respiration in order to obtain energy from the food they produce during photosynthesis. When a plant undergoes cellular respiration, it...
Question 5 options:
produces sugar inside its cells.
breaks down the sugar inside its cells.
releases oxygen through its stomata.
absorbs sunlight through its chloroplasts.
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A car with a mass of 2000 kg is moving around a circular curve at a uniform velocity of 25 m/s per second. The curve has a radius of 80 m what is the centripedal force on the car
two people are pushing a couch from opposite sides. one person pushes with a force of 2 N. the other person pushes with a force of 4 N. which of the following best describes how the couch will move?
The couch will move in the direction of the larger force being applied, which is the side of the person pushing with a force of 4 N.
Explanation:When two people push a couch from opposite sides with forces of 2 N and 4 N respectively, the couch will move in the direction of the larger force. In this instance, the person applying the 4 N force will cause the couch to move in their direction, assuming no other forces are at play (like friction from the floor or additional forces from other directions). The movement can be predicted using Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting upon it and inversely proportional to its mass.
What metric measure would be best to use when measuring the amount of water given to a plant
The best metric is a combination of volume, frequency, soil moisture, evapotranspiration rate, and plant growth and health observation.
When measuring the amount of water given to a plant, it's crucial to choose a metric that accurately reflects the plant's needs and ensures optimal growth. The best metric to use for this purpose is:
1. **Volume of Water**: Measure water in milliliters or liters to quantify the actual amount provided to the plant.
2. **Frequency**: Track how often water is given, whether daily, weekly, or based on the plant's specific requirements.
3. **Moisture Content**: Use a soil moisture meter to gauge the water content in the soil around the plant's roots.
4. **Evapotranspiration Rate**: Consider the rate at which water evaporates from the soil and is transpired by the plant. This can help determine the water loss and replenishment needed.
5. **Plant Growth and Health**: Ultimately, the best measure is the plant's response. Monitor its growth, foliage appearance, and overall health to adjust watering practices accordingly.
By combining these metrics, you can ensure the plant receives the appropriate amount of water for optimal growth and health.
what is the mass of an atom with seven protons.seven neutrons,and eight electrons?
Explanation:
It is given that the atom has 7 protons this means that atomic number of the atom is 7.
As we know that atomic mass of an atom is the sum of total number of protons and neutrons present in the atom.
So, atomic mass of the given atom = no. of protons + no. of neutrons
= 7 + 7
= 14
Thus, we can conclude that the mass of given atom is 14 g/mol.
The mass of an atom with seven protons, seven neutrons, and eight electrons is 14 g
Given the following information from the question
Number of protons = 7 protons
Number of neutrons = 7 neutrons
Number of electrons = 8 electrons
The mass number of an atom is the sum of its atomic number and neutron number.
Mass number = number of neutron + atomic number
Since the atomic number of an element is equal to the number of protons of such elements, hence;
Mass number = 7 + 7
Mass number = 14 g
Hence the mass of an atom with seven protons, seven neutrons, and eight electrons is 14 g
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Animals do not contribute to natural erosion. Please select the best answer from the choices provided T F
The answer is False hope this helps
Answer: false
Explanation: Animals do contribute to natural erosion. Plants help in keeping the soil at place. Some animals burrow the soil to live and helps in moving of soil from one place to another( process called soil erosion). Some animals leads to rapid destruction of plants and leads to faster erosion of soil as plants helps to keep soil at place. Lesser the number of plants will lead to more soil erosion.
explain why electromagnetic radiation sometimes act as a wave and sometimes as a stream of particles?
List two benefits and two applications of ultrasound
Ultrasound benefits;
1. They are used in medicine for a noninvasive diagnostic scan of the body
2. They have no ionizing radiation hence harmless compared to others radiations such as X-rays
Applications of ultrasound;
1. Used in medicine e.g by obstetricians to monitor developing fetus in the womb
2. Used in therapy such as ultrasound assisted thrombolysis
Sample Response: Two benefits of ultrasound imaging are that the patient is not exposed to ionizing radiation and the images are captured in real time. Ultrasound imaging is used to view the fetus during pregnancy and in echocardiograms to view the heart