Answer:
Maximum force of friction, F = 912.38 N
Explanation:
It is given that,
Mass of doghouse, m = 98 kg
Coefficient of friction between doghouse and the ground, μ = 0.95
We have to find the maximum force of friction between the doghouse and the ground. It is given by :
F = μ N
N = normal force = mg
F = μmg
F = 0.95 × 98 kg × 9.8 m/s²
F = 912.38 N
Hence, this is the required solution.
To remove a tight fitting lid from a jar, Megan runs the lid under hot water. What happenes to the jar lid when its temperature increases?
(a) The temperature increases, the lid expands
(b) The potential energy decreases, and the lid expands
(c) The potential energy increases, and the lid contracts
(d) The temperature decreases, and the lid contracts
Answer:
(a) The temperature increases, the lid expands
Explanation:
Running the lid under hot water will result in the transfer of heat from the water to the lid of the jar.
The heating up of the lid increases its temperature and the average kinetic energy of the molecules of the lid. Hence, the jar lid to expand and becomes easier to open.
The correct option is a.
Spark caused when electricity in a thunderhead discharges
A crane is used to swing a 450 kg wrecking ball into a 500 kg wall. The crane takes 5 s to push the ball into the building. The crane provides 2000 N of force. The ball is left moving 10 m/s after the collision. How fast is the wall moving afterwards? *
How does the kinetic energy change in the crane problem?
1. KE increases
2. KE decreases
3. KE stays the same
What type of collision is this?
elasti
inelastic
Arrange the objects in order from least to greatest potential energy. Assume that gravity is constant. (Use PE = m × g × h.)
Using a simple machine, a student is able to lift a 500N weight by applying only 100N.
What is the mechanical advantage of the simple machine?
A) 0.2
B) 1
C) 5
D) 50000
Which is the best definition of a solution? A. A solution is any two liquids mixed. B. A solution is two gases mixed together. C. A solution is the same as a mixture. D. A solution is a mixture that has the same composition throughout.
Wave A has a longer wavelength than wave B, but their amplitudes are the same. Which carries more energy?
Astronauts appear weightless while working in the International Space Station because A) they are in a state of free fall. B) there isn't any gravity in outer space. C) they have very little mass when in outer space. D) they have gravitational attractions to the sun and moon.
Astronauts appear weightless while working in the International Space Station because they are in a state of free fall. The correct option is A.
What is International Space Station?The International Space Station is the largest modular space station in low Earth orbit at the moment.
It is a multinational collaborative project in which five space agencies are involved: NASA, Roscosmos, JAXA, ESA, and CSA.
International Space Station (ISS), low-Earth orbit space station built primarily by the United States and Russia with assistance and components from a multinational consortium.
According to Valerie Neal, curator of space history at the National Air and Space Museum, they experience weightlessness not because of a lack of gravity, but because the ISS and they are orbiting Earth in constant free fall.
They're both falling toward Earth and moving forward at roughly the same speed.
Thus, the correct option is A.
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What distance is traveled by a police car that moves at a constant speed of 2.5 m/s for 20 s? Include the correct units with your answer.
Please help ASAP!
Physics
Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.
His answer is f(x) = ()2 – 5.
Final answer:
The quadratic function f(x) = x² + 6x + 4 has been rewritten in vertex form by completing the square, resulting in f(x) = (x + 3)² 5 with a vertex at (-3, -5).
Explanation:
The student's question involves rewriting a quadratic function in vertex form. To convert f(x) = x² + 6x + 4 into vertex form, we need to complete the square. This involves adjusting the equation so that we have a perfect square trinomial, which can then be expressed in the form (x-h)² + k, where (h, k) is the vertex of the parabola.
Let's complete the square for the given function:
First, we rewrite the function as f(x) = (x² + 6x) + 4.
To complete the square, we need to find a number that, when added and subtracted inside the parenthesis, creates a perfect square trinomial. This number is (6/2)² = 9.
We add and subtract 9 inside the parenthesis: f(x) = (x² + 6x + 9) - 9 + 4.
The equation inside the parenthesis is now a perfect square and can be written as (x + 3)², and we combine the constants outside: f(x) = (x + 3)² - 5.
This is the vertex form of the given quadratic equation. The vertex of the parabola is (-3, -5).
Describe how water may be treated before people use it
The electric field between two parallel plates has a magnitude of 875 n/
c. the positive plate is 0.002 m away from the negative plate.
HELP WILL MEDAL !!!!!!!!!!!!!!!!!!!
Suppose you are an astronomer, and a child asks you to explain how long it takes light to travel through space. In your own words, answer the child's question. Be sure to mention the speed that light travels in space, and provide a general idea of how long it takes the light from distant stars to reach Earth.
It would take almost 2 years for the fastest human-made spacecraft to travel from earth to europa. about how long would it take such a spacecraft to travel to wolf 359? study island
Answer:
several million years
Explanation:
Final answer:
The fastest human-made spacecraft would take almost 80,000 years to reach the nearest star, so it would take much longer to reach Wolf 359.
Explanation:
The question asks about the travel time of the fastest human-made spacecraft to reach Wolf 359. According to the provided information, the fastest spacecraft so far would take almost 80,000 years to reach the nearest star. As Wolf 359 is farther than the nearest star, it would likely take much longer than that for a spacecraft to reach it.
Which compound is held together by the electrostatic force between two ions?
A. CF4
B. NH3
C. CaBr2
D. CO2
Answer: Option (C) is the correct answer.
Explanation:
A compound that is formed by transfer of electrons results in the formation of an ionic bond and it is known as an ionic compound.
For example, calcium has 2 valence electrons and bromine has 7 valence electrons. So, in order to complete their octet calcium donates its two valence electrons to two bromine atoms.
Therefore, it results in the formation of an ionic compound [tex]CaBr_{2}[/tex].
In an ionic compound there is partial positive charge on the cation and partial negative charge on the anion.
Whereas a compound formed by sharing of electrons is known as a covalent compound.
For example, [tex]CF_{4}[/tex], [tex]NH_{3}[/tex] and [tex]CO_{2}[/tex] are all covalent compounds.
Thus, we can conclude that [tex]CaBr_{2}[/tex] is the compound that is held together by the electrostatic force between two ions.
A kangaroo jumps to a vertical height of 251 cm. how long (in seconds) was the kangaroo in the air?
Ryan is experimenting with core materials for an electromagnet. He slides different core materials through a coil of current-carrying wire. Sort the core materials based on whether they will or won’t increase the strength of Ryan’s electromagnet.
What items resemble the path of light when it travels through space?
The path of light across space will be resembled water gushing out of a garden hose. Both show the same behavior.
What is light?The electromagnetic wave is released by heated things such as lasers, and bulbs are known as light.
Light is a sort of kinetic energy that enables us to perceive or make visible objects with our eyes. Light energy, which is a kind of electromagnetic radiation, may be seen by the human eye.
The path of light across space will be resembled water gushing out of a garden hose.
However, if nothing blocks the source of the beam of light, such as the sun, the beam of light will spread out in all directions, similar to a bomb explosion.
Between any two points, light always takes the quickest path. The shortest path between the sun and the earth allows light from the solar to reach the earth.
Hence the path of light across space will be resembled water gushing out of a garden hose.
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If an antenna is much longer than the wavelength, what is the typical result?
In 1865, jules verne proposed sending men to the moon by firing a space capsule from a 220-m-long cannon with final speed of 10.97 km/s. what would have been the unrealistically large acceleration experienced by the space travelers during their launch? (a human can stand an acceleration of 15g for a short time.)
Which formula can be used to find the x-component of the resultant vector? Tx - Ux - Vx Tx + Ux + Vx Tx = Tcosθ Tx = Tsinθ
Answer:
Tx + Ux + Vx
Explanation:
Just add everything on the x-axis!
You can see that an apple is red because the red wavelength is ______________off the apple and all other colors are __________________. *
A. absorbed; reflected
B. reflected; absorbed
C. transmitted; reflected
D. transmitted; absorbed
The complete statement is -
" You can see that an apple is red because the red wavelength is reflected off the apple and all other colors are absorbed ".
What is Absorption? What is Absorbance of light? What is Beer - Lamberts Law?Absorbance is defined as the logarithm of the ratio of incident to transmitted radiant power through a sample (excluding the effects on cell walls).The term absorption refers to the physical process of absorbing light, while absorbance does not always measure only absorption; it may measure attenuation (of transmitted radiant power) caused by absorption, as well as reflection, scattering, and other physical processesBeer - Lamberts Law states that if I{o} is the intensity of the light at the beginning of the travel and I{s} is the intensity of the light detected after travel of a distance {d}, the fraction transmitted {T} is given by -[tex]${\displaystyle T={\frac {I_{s}}{I_{0}}}=\exp(-\mu d)}[/tex]
Given is the statement as -
You can see that an apple is red because the red wavelength is ______________off the apple and all other colors are _________________".
The complete statement will be -
You can see that an apple is red because the red wavelength is reflected off the apple and all other colors are absorbed.
It is because eyes can perceive only the reflected rays {that enter our eyes} and not the absorbed rays.
Therefore, the complete statement is -
" You can see that an apple is red because the red wavelength is reflected off the apple and all other colors are absorbed ".
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Why does a curve on a distance-time graph indicate acceleration
... Speeding up or slowing down are two of the three forms of acceleration.
... The SLOPE of the line on a distance/time graph is the object's speed.
... If the graph is curved, then its slope is changing.
That means the object's speed is changing.
That means the object is accelerating.
Final answer:
A curve on a distance-time graph indicates acceleration because the slope of the graph reflects velocity, which changes when acceleration is present. A straight line represents constant velocity with no acceleration, while a changing slope means varying velocity, indicating acceleration.
Explanation:
On a distance-time graph, a curve indicates acceleration because the slope of the graph represents velocity, which is distance divided by time. When velocity changes, it means there is an acceleration present. If the graph is a straight line, the slope is constant, and the velocity is uniform, hence, no acceleration. When the slope (or the 'steepness' of the curve) changes, it indicates a changing velocity. A steeper slope means an increase in velocity, indicative of positive acceleration, while a slope that becomes less steep suggests a slowing down, or negative acceleration.
Accurate depiction of acceleration in physics requires consideration of the shape of the curve on a position vs. time graph. A parabolic curve suggests constant acceleration, while a hyperbola might represent acceleration defined in specific intervals. The 'cup' of the curve pointing up or down indicates the direction of acceleration. It's important to understand that while a velocity-time graph can show instantaneous acceleration as the slope of the tangent line, the position-time graph's relationship to acceleration is more indirect and is reflected in the curvature of the graph.
From just the atomic number, what else is known?
a) the chemical number
b) the number of neutrons
c) the atomic mass
d) the number of protons
Answer:the number of protons
In the light reactions, electrons from _______ replenish chlorophyll molecules that have given up electrons.
Answer: water
The light reactions of noncyclic photophosphorylation takes place in the chloroplast. The light energy is converted to chemical energy to produce both ATP and NADPH, which act as energy-transfer molecules in the light-independent reactions of the Calvin cycle. The addition of phosphate due to synthesizing of ATP by cells results to photophosphorylation.
Moreover, the electrons from water replenish chlorophyll molecules that have given up electrons by photolysis. The two electrons from the water molecule are kept in photosystem II, while the 2H+ and 1/2O2 are left out for further use.
.
Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing? A) small size B) low energy C) high energy D) high velocity
Answer:
A) Low Energy
Explanation:
Red colour light is light with larger wavelength due to which it can travel large distance. Due to this property of red colour light we use this colour to show different signals so that they are visible from distance
Here we also know by the formula of energy
[tex]E = \frac{hc}{\lambda}[/tex]
here we can see that the wavelength of light and energy of light is inversely depends on each other
So here we can say that red colour light is of larger wavelength and smaller energy due to which it can travel larger distance
so correct answer is
A) Low Energy
"LOOKALIKES" You are given two identical-looking metal cylinders and a long rope. The cylinders have the same size and shape and they weigh the same. You are told that one of them is hollow, the other is solid. How would you determine which is which using only the rope and the two cylinders?
One can be able to determine the metal cylinders based on the time taken to unwrap them.
From the information given, there are two identical-looking metal cylinders and a long rope and the cylinders have the same size, shape, and weight.
One can be able to differentiate then by using only the rope and the two cylinders by wrapping the rope around the cylinder. The hollow cylinder will take longer to wrap when compared to the solid one.
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a small dog is trained to jump straight up a distance of 1.2m. How much kinetic energy does the 7.2kg dog need to jump this high? ( the acceleration due to gravity is 9.8m/s2)
A test charge is introduced into the electric field of a charge. It feels a force of 2F where the electric field is 2E. What would the force on the test charge be where the electric field is 8E?
Somebody explain how you would get the answer.
Final answer:
The force (F') on the test charge in an electric field of 8E will be 8 times the original force F because the electric force is directly proportional to the electric field strength (E), as described by the equation F = qE.
Explanation:
The relationship between electric force (F) and electric field strength (E) is a direct one, captured by the equation F = qE, where q is the charge of a test charge, and E is the strength of the electric field. In the scenario provided, a test charge initially feels a force of 2F in an electric field of 2E. Hence, we can infer that this force scales linearly with the electric field, given that the charge (q) on the test charge is constant.
If the electric field is later increased to 8E, we can use the direct proportionality between F and E to calculate the new force (F').
If the initial situation is 2F = q(2E), the new force at 8E would be:
F' = q(8E)
Since 2F = q(2E), we can substitute qE from the initial force to get:
F' = (4)(2F) = 8F.
The new force on the test charge when the electric field is 8E will be 8 times the original force F.
which of the following planets most likely has the coldest surface temperature