A ball is dropped and falls with an acceleration of 9.8 m/s2 downward. It hits the ground with a velocity of 49 m/s downward. How long did it take the ball to fall to the ground?
It would take the ball 5 seconds to fall to the ground.
Given the following data:
Acceleration = 9.8 [tex]m/s^2[/tex]Final velocity = 49 m/s.Initial velocity = 0 m/s (since the ball is starting from rest).To find how long (time) it took the ball to fall to the ground, we would use the first equation of motion;
Mathematically, the first equation of motion is calculated by using the formula;
[tex]V = U + at[/tex]
Where:
A is the acceleration. V is the final velocity. U is the initial velocity. t is the time measured in seconds.Substituting the given parameters into the formula, we have;
[tex]49 = 0 + 9.8t\\\\49 = 9.8t\\\\t = \frac{49}{9.8}[/tex]
Time, t = 5 seconds.
Therefore, it would take the ball 5 seconds to fall to the ground.
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A machine shovel moves dirt at the rate of 1,100 pounds of dirt 1 foot in 1 second. How many horsepower is this?
The machine shovel that moves 1,100 pounds of dirt 1 foot in 1 second exhibits 2 horsepower, based on the calculation that compares the work done in foot-pounds per second to the standard definition of one horsepower as 550 foot-pounds per second.
To calculate the amount of horsepower exhibited by a shovel machine moving 1,100 pounds of dirt 1 foot in 1 second, we can use the definition of horsepower. By definition, one horsepower is equal to 550 foot-pounds per second. The machine does 1,100 foot-pounds of work per second (since it moves 1,100 pounds over 1 foot in 1 second).
Now, we calculate the horsepower
Power (hp) = Work (foot-pounds per second) / 550
Power (hp) = 1,100 foot-pounds per second / 550
Power (hp) = 2 hp
Thus, the machine shovel operates at 2 horsepower.
Why does the earth rotate
It also moves with respect to the Earth's crust; this is called polar motion. Precession is a rotation of the Earth's rotation axis, caused primarily by external torques from the gravity of the Sun, Moon and other bodies. The polar motion is primarily due to free core nutation and the Chandler wobble.
Which of the following is not a type of plate boundary?
A. Transform
B. Tectonic
C. Convergent
D. Divergent
The answer is B. Tectonic. This is not a recognized type of plate boundary. The plate boundaries recognized by geologists are transform, convergent, and divergent.
Explanation:The type of plate boundary that is not recognized among the classic types established by geologists is B. Tectonic. In plate tectonics, a discipline within earth sciences, plate boundaries are classified into three main types: A. Transform, C. Convergent, and D. Divergent. Each type describes a different way in which tectonic plates, the large pieces of Earth's lithosphere, interact with each other. Transform boundaries occur when plates slide past each other horizontally. Convergent boundaries form when plates come together or converge. Divergent boundaries are created when plates move apart from each other or diverge. 'Tectonic' is not a type of plate boundary, but rather an adjective used to describe phenomena related to Earth's tectonic plates.
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Which of the following is likely to contribute to geological events that take place on Earth?
Crust undergoing convective currents
Crust being of uniform thickness throughout
Crust being a single layer that surrounds Earth
Crust sitting on top of molten rock of the mantle
Answer:
Crust sitting on top of molten rock of the mantle
Explanation:
Earth's crust is the geological name for what we usually call the surface of the planet, and it is immediately above the molten rock of the mantle, the next layer of the planet.
The crust happens to be fragmented in large pieces or tectonic plates, that can be seen as "drifting" on the mantle's molten rock, also known as magma.
In some areas tectonic plates are drifting away, allowing magma to reach the surface (volcanoes for example), or the seabed (forming mid-oceans crests).
In other areas tectonic plates are crashing each other, causing earthquakes, tidal waves, mountain formation and other relevant geological events.
Maddie and Raul were looking at samples of pond water using the class microscope. They saw some things in the water. They thought the things might be alive, but were not sure. They did a search on-line and found this image. It looked like what they were seeing through the microscope lens. Were the students correct? Explain.
Which of the following situations would cause the greatest increase in the motion of molecules in a system? A. The system absorbs 75 J of heat, and its volume is halved. B. The system releases 75 J of heat, and its volume doubles. C. The system absorbs 75 J of heat, and its volume doubles. D. The system releases 75 J of heat, and its volume is halved.
Answer:
The correct answer is A. The system absorbs 75 J of heat, and its volume is halved.
Explanation:
For this question, we want the system's molecular motion to experience an INCREASE. So if your question is asking for a DECREASE in molecular motion, this answer does not apply! Instead, it would be "The system releases 75 J of heat, and its volume doubles." Let me explain.
Molecular motion increases with increasing temperature, since collisions increase. For that reason, we want to look for the answer choice that experiences an increase in temperature, with would mean that the system absorbs (NOT RELEASES) 75 J of heat. Additionally, a system's molecular motion increases when its volume decreases. With a smaller volume, molecules are closer together and hit each other more often, increasing molecular motion. And so, for the motion of molecules to INCREASE, the volume would actually have to decrease or be halved! Answer choice A is correct!
If that explanation isn't enough to sway you, know that I took this computer-scored test and received 100%. If you review your study notes from this unit, you'll see that my answer makes sense. I hope that helped! :)
When studying the attraction between objects, which of the following can be concluded?
Answer:
2 , 4
Explanation:
Light traveling through air strikes the surface of the four different materials below. which material reflects light but doesn't refract it?
Options:
A-Metal Spoon
B-Water Droplets
C-Diamond
D-Prism
Why is carbon monoxide such as dangerous form of indoor air pollution?
The tuning fork is producing a wave that contains compressions and rarefactions. It is a ________ wave.
A) compaction
B) transverse
C) latitudinal
D) longitudinal
Answer:
D)
Explanation:
What is the speed of a wave if the wavelength is 100 m and the period is 20 s? 2,000 m/s 120 m/s 80 m/s 5 m/s
The speed of the wave is 5 m/s.
What is wave speed?Wavelength and time period both influence wave speed. The distance between two similar spots on adjacent waves is known as the wavelength. Time period is the amount of time needed for a wave to pass a fixed location.
This equation demonstrates how the three variables are connected:
Speed of wave = Wavelength ÷ Time period.
Given parameters:
The wavelength of the wave; λ = 100 m.
Time period of the wave; T = 20 s.
Then, speed of the wave; v = ?
We know that,
The speed of the wave; v = λ/T = (100m/20s) = 5 m/s.
Hence, the speed of the wave is 5 m/s.
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A study published in Science notes that water flowing from the Atlantic Ocean into the Arctic is warmer than it's been in 2,000 years. Scientists believe that this increased heat input has far-reaching consequences to life on Earth. U.S. and European scientists studied the Fram Strait branch of the North Atlantic Current, the ocean current that carries heat north from the tropics. By studying tiny-shelled organisms called foraminifera found deep in the ocean floor, they could chart temperatures going back 2,000 years. From their findings, scientists reported that the water has warmed about 2o C since the late 1800's. We would expect warmer Northern Atlantic currents to have all BUT ONE of these consequences on Earth.
Answer:
C
Explanation:
decreased precipitation
which of these would be best explained by the Doppler effect? A) the change in frequency as you shorten a guitar string. B) the change in pitch heard as an ambulance approaches you. C) the change in volume as a train pulls away from the station. D) the change in seed of a sound wave as it travels from air into water.
Which model represents a fraction greater than 3/5
To represent a fraction greater than 3/5, choose a numerator larger than 3 and match it with a denominator. Fractions like 4/6, 5/7, or 10/12 are examples of fractions greater than 3/5.
Fractions greater than 3/5 are represented by fractions where the numerator is larger than the denominator. For example, 4/6 is greater than 3/5 because the numerator 4 is greater than the denominator 6.
To find a fraction larger than 3/5, you can choose any numerator larger than 3 and pair it with a denominator to form a fraction greater than 3/5, such as 4/6, 5/7, or 10/12.
What is the potential energy of a 150 kg diver standing on a diving board that is 10 m high?
The potential energy is
J.
Answer:
The potential energy is 14700J.
Explanation:
Definition of potential energy:
Potential energy is the energy that measures the ability of a object to perform a job based solely on its position (height at which the object is from the ground), and it is calculated with the following formula:
Ep= m*g*h Formula (1)
Ep: Potential energy in Joules (J)
m : mass (kg)
g: acceleration due to gravity (m/s²)
h: height (m)
Data
m= 150 kg
g = 9.8 m/s²
h= 10 m
Problem development
We replace data in formula (1)
Ep= 150 kg*9.8 m/s²*10 m = 14700 N*m = 14700J
Ep= 14700J
Light bending as it passes through a rain drop is an example of...
A. Transmission
B. Reflection
C. Refraction
HELP PLS! AND MAKE SURE YOU ARE CORRECT ON ALL OF THEM DUE TOMORROW
Question 2
Which layer of the atmosphere has the most air pressure?
exosphere
stratosphere
troposphere
mesosphere
Question 3
Which best explains heating by convection?
Air molecules touch the warm ground, heating them up.
Warm air rises and takes heat with it; eventually it cools and sinks.
Sunlight travels through space without the aid of fluids or solids.
Land and ocean absorb and re-emit heat from the sun.
Question 7
Which conditions are usually the effect of a low air pressure system?
clear, dry weather
cloudy, wet weather
cold, dry weather
hot, dry weather
Question 8
What would cause rain showers to continue over a particular area for several days?
a high-pressure system
a stationary front
low humidity
a warm front
Question 9
What effect does an ocean have on the climate?
Rushing water from tides lead to dry air.
There is no influence on climate from an ocean.
Cool ocean air causes a cool climate.
Warm ocean air causes a dry climate.
What conclusion can you draw based on the data in the scatterplot?
The scatter plot diagram shows us the relation of icecreams with that of consumption
As per the scatter, plot graph shows the increase in the amounts of temperature up to 80° F leads to intake of more ice creams and cones per person going up to 0.56. Hence the increase in temperature lead to changes in buying behavior. More is the temperature more is consumption.Learn more about the conclusion can you draw based on the data in the scatterplot.
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Final answer:
The scatter plot shows a linear pattern, indicating a significant linear relationship between the X and Y variables.
Explanation:
The scatter plot shows a linear pattern in the data, where the points roughly form a straight line. This indicates a linear relationship between the X and Y variables. However, it is important to consider the correlation coefficient as well.
If the correlation coefficient is significantly different from zero, it suggests a strong linear relationship. In this case, there is sufficient evidence to conclude that there is a significant linear relationship between the X and Y variables.
Therefore, the X and Y variables would be good candidates for linear regression to predict outcomes.
Cart A of inertia m has attached to its front end a device that explodes when it hits anything, releasing a quantity of energy E. This cart is moving to the right with speed v when it collides head-on with cart B of inertia 2m traveling to the left at the same speed v. The explosive goes off when the carts hit, causing them to rebound from each other. The initial direction of motion of cart A (to the right) is the +x direction.
Part A
If one-quarter of the explosive energy is dissipated into the incoherent energy of noise and deformation of the carts, what is the final velocity of cart A?
Express your answer in terms of the variables E, v, and m.
Part B
If one-quarter of the explosive energy is dissipated into the incoherent energy of noise and deformation of the carts, what is the final velocity of cart B?
Express your answer in terms of the variables E, v, and m.
Which is an example of the force of attraction between two objects that have mass?
A:Gravity
B:Solar energy
D:Electricity
Xander was traveling at a final velocity of 4.5 m/s for 3.5 seconds. Finley was traveling at a final velocity of 3.6 m/s for 4.2 seconds. Max was traveling at a final velocity of 7.3 m/s for 1.2 seconds. They all started at the same location from rest. Which lists them from least to most acceleration?
Answer: Finley, Xander, Max
Explanation:
The acceleration of each runner is given by:
[tex]a=\frac{v-u}{t}[/tex]
where
v is the final velocity
u is the initial velocity
t is the time taken
- Xander: his acceleration is [tex]a=\frac{4.5 m/s-0}{3.5 s}=1.29 m/s^2[/tex]
- Finley: his acceleration is [tex]a=\frac{3.6 m/s-0}{4.2 s}=0.86 m/s^2[/tex]
- Max: his acceleration is [tex]a=\frac{7.3 m/s-0}{1.2 s}=6.08 m/s^2[/tex]
So, in order from least to most acceleration:
Finley, Xander, Max
Which landform represents the boundary between the land and an ocean or a lake?
Answer:
coastline
Explanation:
its the coastline
Which statement best describes what Kendall can do? She can measure the volume and mass of the marble, the volume and mass of the water, and the volume and mass of the graduated cylinder. She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder. She can measure the volume of the marble and water, and the mass of the graduated cylinder. She can measure the mass of the marble and water, and the volume of the graduated cylinder
Answer: its b
She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder.
Explanation:
i got it wrong it is b not A
Kendall can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder, therefore the correct answer is option B
What is the matter?Anything which has mass and occupies space is known as matter, mainly there are four states of matter solid liquid gases, and plasma.
These different states of matter have different characteristics according to which they vary their volume and shape.
As per the given problem The statement that can best describes what Kendall can do is that She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder
The right response is option B since Kendall can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder.
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The pictures shows what a student observed when he looked through a hand lens at a penny.
What happens to light passing through a hand lens that makes the image of the penny appear larger?
The light is-
A. Refracted
B. Stopped
C . Absorbed
D . Reflected
Light is refracted when it passes through a hand lens that makes the image of the penny appear larger.
What is Refraction?This is defined as the process in which waves change direction when they move from one medium to another.
The hand lens changes the speed of the waves which therefore brings about this occurrence.
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How does a compound eye work?
A compound eye, primarily found in arthropods, consists of numerous small units called ommatidia. These units, which include lenses and visual cells, create a mosaic image allowing insects to detect motion efficiently due to the flicker effect.
The compound eye is an optical structure found in certain animals, notably arthropods such as insects and crustaceans. Unlike the human eye, which has a single lens, the compound eye is made up of numerous small visual units called ommatidia. Each ommatidium is a self-contained photoreception unit that consists of a lens, cone, visual cells, and pigment cells. These units capture parts of the visual field and send nerve impulses to form a mosaic image, similar to a pattern of light and dark dots.
Flicker effect is a distinctive feature of compound eyes which makes them highly sensitive to motion. As an object moves across an insect's visual field, some ommatidia are exposed to light while others are not, creating a flicker that the insect can detect. This property allows insects to respond quickly to moving objects, which is crucial for their survival. Animals with compound eyes, like honeybees, are particularly adept at recognizing motion, preferring to visit wind-blown flowers over stationary ones.
The visual acuity in compound eyes is determined by the number of ommatidia and the fineness of the mosaic they create.
If a bar of copper is brought near a magnet, the copper bar will be
Pennfoster:
A. attracted by the magnet.
B. unaffected by the magnet.
C. repelled by the magnet.
D. made into an induced magnet.
What is the energy of a photon with a frequency of 2.2 × 1016 Hz? Planck’s constant is 6.63 × 10–34 J•s.
1.5 × 10–17 J
8.8 × 10–17 J
1.5 × 10–16 J
8.8 × 10–16 J
Taking into account the definition of photon and energy of a photon, the correct answer is the first option: The energy of a photon with a frequency of 2.2×10¹⁶ Hz is 1.5×10⁻¹⁷ J.
You have to know that electromagnetic radiation carries energy, which can be absorbed or emitted. To explain the processes of emission and absorption, Plank and Einstein proposed that the energy of radiation is composed of indivisible units (quanta). In each elemental process only a quantum of light can be emitted or absorbed. Each of these quanta was called a "photon".
The exchanges of energy between matter and radiation take place not continuously, but by discrete and indivisible quantities or quanta of energy. The quantum of energy is proportional to the frequency of radiation.
The relationship between the amount of energy (E) transported by the photon and its frequency (f) is determined by the following expression, where the energy of a photon is obtained by multiplying Planck's constant h by the frequency f of electromagnetic radiation:
E=h×f
In this case, you know:
h= 6.63*10⁻³⁴ Jsf= 2.2×10¹⁶ HzReplacing:
E= 2.2×10¹⁶ Hz× 6.63×10⁻³⁴ Js
E= 1.4586×10⁻¹⁷ J≅ 1.5×10⁻¹⁷ J
The correct answer is the first option: The energy of a photon with a frequency of 2.2×10¹⁶ Hz is 1.5×10⁻¹⁷ J.
Learn more:
https://brainly.com/question/8924116?referrer=searchResultshttps://brainly.com/question/6945706?referrer=searchResultshttps://brainly.com/question/8000078?referrer=searchResultsIf you were measuring a lower-pitched sound wave, you would measure _____.
A. more compressions per second
B. fewer compressions per second
C. a greater amount of compression of the air
D. a smaller amount of compression of the air
Answer: B
To measure a lower-pitched sound wave, you would measure fewer compressions per second. Pitch relates to frequency by measuring how many times a second the particles vibrate. Therefore, the lower-pitched sounds, the fewer compression waves or sound waves are produce because low-frequency sounds have greater distance between each wave.
Moreover, the frequency of a wave is measured as the number of complete back-and-forth vibrations of a particle of the medium per unit of time. The universal unit for frequency used is the Hertz (abbreviated Hz), where 1 Hertz = 1 vibration/second.
What is the purpose of the three R’s of resource management?
The three R's of resource management stand for reduce, reuse, and recycle. Together, they form a cornerstone philosophy for managing our resources sustainably.
The first R, reduce, emphasizes the importance of cutting back on the amount of waste we produce and reducing our consumption patterns. Reuse encourages us to repurpose items instead of discarding them, thus extending their life cycle and diminishing the need to consume new resources. Lastly, recycle involves processing used materials to create new products, which conserves raw materials and reduces the need for energy-intensive manufacturing processes.
The purpose of the three R's is to: 1. Distribute resources fairly among people, ensuring that resources do not become excessively depleted by overconsumption. 2. Conserve resources so that they are available for future generations without running the risk of depletion. 3. Use resources in ways that do not harm ecosystems, maintaining the delicate balance of our environment.
Effectively applying these principles contributes to the sustainability of rural and regional communities, and ensures that resources are used wisely. This approach helps to transition society from consumerism to conservation, a concept proposed by environmental advocates like the Pollution Probe and governmental advisory boards such as Canada's Science Council in the early 1970s.