Answer:
I know this need u in online class LOL
Explanation:
Ultraviolet is a form of electromagnetic radiation with wavelength from 10 to 400 nm, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.
starting from rest, a car accelerates to 45 m/s in 1 minute. what is the average acceleration of the car in m/s^2 ?
Answer:
given us,
initial velocity (u)= 45m/s
time(t)= 1 min
final velocity (v)=?
here,
average acceleration = v-u/t
= v- 45/1
v= 45/1
:. v=45m/s
:. the average acceleration of the car in m/s^2 is 45m/s
Explanation:
we can use acceleration formula
The distance a toy car travels over time is shown in the graph.
Which table best shows the average speed of the toy car at different time intervals?
Answer:
A
Explanation:
0-2 1.0
2-4 0.5
4-6 0
The table of velocity of toy car is drawn below.
What is velocity ?
velocity is defined as rate of change of displacement of the object with respect to rate of change in time. In mathematics It is written as :
[tex]\begin{aligned}v= \frac{\Delta d}{\Delta t}=\frac{d_{2}-d{1}}{t_{2}-t_1}\end{aligned}[/tex]
considering time interval from t=0 sec to t=2 sec the distance travelled by the toy car is d=0m to d=2m. therefore, the velocity will be :
[tex]\begin{aligned}v&=\frac{d_{2}-d{1}}{t_{2}-t_1}\\&=\frac{2-0}{2-0}\\&=1 \text{\:m/s}\end{aligned}[/tex]
similarly for interval t = (2sec - 4sec ) and t = (4sec - 6sec) is also calculate and written in table below.
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please help me.
During a football game, one of the players on the home team kicks the football that has a
mass of 0.6 kg so that the ball accelerates toward the opposing team at
23 m/s2. If no other forces act on the ball, how much force did the kicker apply to the
football?
Answer:
[tex]Force = 13.8N[/tex]
Explanation:
Given
[tex]Mass = 0.6kg[/tex]
[tex]Acceleration = 23m/s^2[/tex]
Required
Determine the applied force
From the question, we understand that no other force acts on the ball.
i.e. the only applied force on the ball is the force applied by the striker.
So, we apply Newton's second law to solve this question.
And this implies that:
[tex]Force = Mass * Acceleration[/tex]
[tex]Force = 0.6kg * 23m/s^2[/tex]
[tex]Force = 13.8N[/tex]
Hence, the applied force by the striker on the ball is 13.8N
can someone pls help me?!!!! i need it asap!! i’m very stressed
Answer:
Acceleration
Explanation:
Its speed or velocity change
Explain why people have different skin colors?
I think it because of UV rays ultra violet ray which can make their colors different
Which of the following accurately describes circuits? Question 6 options: A) In a parallel circuit, the same amount of current flows through each part of the circuit. B) In a series circuit, the amount of current passing through each part of the circuit may vary. C) In a series circuit, the current can flow through only one path from start to finish. D) In a parallel circuit, there's only one path for the current to travel.
Answer:
Explanation: C is the correct one
because A) the current divides into parts for each branch
B)the current doesn't varry in series
D) in parallel the current divides and passes in all branches
Kinetic energy of 110 j and velocity of 70 m/s what is the mass
Answer:
0.04kg
Explanation:
Explanation in pics:
The formula for kinetic energy is KE = 1/2mv². So now the question asks for the mass, not KE. So we need to rearrange the formula so that we are calculating the mass. So, the formula for mass is m=KE/(1/2v²). Now we just substitute the values into the formula. Then just follow what it shows in the pic
a bus is moving with the velociity of 36 km/hr . after seeing a boy at 20 m ahead on the road, the driver applies the brake and the bus gets stopped at 10 m distance. Now, calculate acceleration as well as time taken by this bus to stop.
Answer:
Assumption: the acceleration of this bus is constant while the brake was applied.
Acceleration of this bus: approximately [tex]\left(-6.0\; \rm m \cdot s^{-2}\right)[/tex].
It took the bus approximately [tex]1.7\;\rm s[/tex] to come to a stop.
Explanation:
Quantities:
Displacement of the bus: [tex]x = 10\; \rm m[/tex].Initial velocity of the bus: [tex]\displaystyle u = 36\; \rm km \cdot hr^{-1} = 36\; \rm km \cdot hr^{-1}\times \frac{1\; \rm m \cdot s^{-1}}{3.6\; \rm km\cdot hr^{-1}} = 10\; \rm m \cdot s^{-1}[/tex].Final velocity of the bus: [tex]v = 0\; \rm m\cdot s^{-1}[/tex] because the bus has come to a stop.Acceleration, [tex]a[/tex]: unknown, but assumed to be a constant.Time taken, [tex]t[/tex]: unknown.Consider the following SUVAT equation:
[tex]\displaystyle x = \frac{1}{2}\, \left(a\, t^2\right) + u\, t[/tex].
On the other hand, assume that the acceleration of this bus is indeed constant. Given the initial and final velocity, the time it took for the bus to stop would be inversely proportional to the acceleration of this bus. That is:
[tex]\displaystyle t = \frac{v - u}{a}[/tex].
Therefore, replace the quantity [tex]t[/tex] with the expression [tex]\displaystyle \left(\frac{v - u}{a}\right)[/tex] in that SUVAT equation:
[tex]\displaystyle x = \frac{1}{2}\, \left(a\, \left(\frac{v -u}{a}\right)^2\right) + u\, \left(\frac{v - u}{a}\right)[/tex].
Simplify this equation:
[tex]\begin{aligned}x &= \frac{1}{2}\, \left(a\, {\left(\frac{v -u}{a}\right)}^2\right) + u\, \left(\frac{v - u}{a}\right) \\ &= \frac{1}{2}\left(\frac{{(v - u)}^2}{a}\right) + \frac{u\, (v - u)}{a} =\frac{1}{a}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right)\end{aligned}[/tex].
Therefore, [tex]\displaystyle a= \frac{1}{x}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right)[/tex].
In this question, the value of [tex]x[/tex], [tex]u[/tex], and [tex]v[/tex] are already known:
[tex]x = 10\; \rm m[/tex].[tex]\displaystyle u =10\; \rm m \cdot s^{-1}[/tex].[tex]v = 0\; \rm m\cdot s^{-1}[/tex].Substitute these quantities into this equation to find the value of [tex]a[/tex]:
[tex]\begin{aligned} a &= \frac{1}{x}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right) \\ &= \frac{1}{10\; \rm m}\times \left(\frac{{\left(0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}\right)}^2}{2} + \left(0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}\right)\times 10\; \rm m \cdot s^{-1}\right)\\ &\approx -6.0\; \rm m \cdot s^{-2}\end{aligned}[/tex].
(The value of acceleration [tex]a[/tex] is less than zero because the velocity of the bus was getting smaller.)
Substitute [tex]a \approx -6.0\; \rm m \cdot s^{-2}[/tex] (alongside [tex]u = 10\; \rm m \cdot s^{-1}[/tex] and [tex]v = 0\; \rm m \cdot s^{-1}[/tex]) to estimate the time required for the bus to come to a stop:
[tex]\begin{aligned}t &= \frac{v - u}{a} \\ &\approx \frac{0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}}{-6.0\; \rm m \cdot s^{-2}} \approx 1.7\; \rm s\end{aligned}[/tex].
Why does conduction occur in solids?
Answer:
Conduction occurs more readily in solids and liquids, where the particles are closer to together, than in gases, where particles are further apart. ... As these molecules collide, thermal energy is transferred via conduction to the rest of the pan.
Explanation:
Metals have tightly packed atoms which can easily pass on their kinetic energy and also have free moving electrons.
How much time does it take a rhino running at 40 m/s to run 250 m?
Answer:
Rhinoceroses are odd-toed ungulates native to sub-Saharan Africa and southern Asia, though all five living species have hugely contracted in range and number due to the influence of humans. Despite their titanic, tank-like bulk, rhinos can be amazingly swift: The fastest may reach at least 50 kilometers per hour (31 mph).
Explanation:
sana makatulong
PLEASE HELP: Use Newton’s second law of motion to determine the unknown values for the following objects in motion. Assume all objects are being accelerated on frictionless surfaces or through frictionless mediums. Calculate the values, and round your answer to the correct number of significant digits. If needed, use the conversion factor 1 lb = .454 kg.
Baseball data: 0.142 kg, 1._________N, 388 m/s2
Football player data: 0.426 m/s2 , 2._________kg, 28.39 N of force pushing the player over the goal line, and 1.98 N of force by defender pushing in the opposite direction
Wagon data: 77.6 lbs,128 N, 3.___________m/s2
Answer:
base ball data 55.1 N
football player 62.0 Kg
wagon data 3.64 m/s2
Explanation:
F=ma
a=f/m
m=f/a
force (N)
mass (KG)
acceleration (A)
The force exerted by Baseball is 55.01 N.
The mass of the Football player is 62.0 Kg.
The acceleration of the Wagon is 3.63 m/s².
What is force?Force is the influence that can change the state of the body of rest or motion. Force is a vector quantity and the SI unit of force is Newton. Force can change the direction and speed of the moving object.
The force can be determined by the product of the mass (m) and acceleration (a). The mathematical expression from the second law of motion for force can be written as:
F = ma
Given, the mass of the baseball is 0.142 Kg and the acceleration of the baseball is 388 m/s2.
The force exerted by the baseball, F = ma = 0.142 Kg × 388 m/s2
F = 55.096 N
F = 55.01 N
Given, the acceleration of the football player, a = 0.426 m/s2
The net force = 28.39 - 1.98 = 26.41 N
The mass of football player, m = F/a = 26.41/0.426 = 61.99 = 62.0 Kg
The force of the wagon, F = 128 N
The mass of the wagon = 77.6 Ibs = 77.6 × 0.454 Kg = 35.23 Kg
The acceleration of the wagon = 128/ 35.23 = 3.63 m/s²
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HURRY 15 POINTS
The third most populated country in the world is __________. A. China B. India C. Canada D. the United States Please select the best answer from the choices provided A B C or D. Only pick one. this is from edunity.
Answer:
D. The United States
Explanation:
Which of the following changes to Earth's atmosphere would increase the greenhouse effect
Select all that apply.
increasing the concentration of CO2
increasing the number of N, molecules
decreasing the concentration of CH4
decreasing the amount of water vapor
Answer:Increasing the concentration of CO2
Explanation:
I might be wrong, don't try so sorry if i'm wrong!
The changes to the Earth's atmosphere would increase the greenhouse effect and it is caused by
increasing the concentration of CO2increasing the number of N, molecules.What is Green house effect?Green house effect refers to different release of greenhouse gases like co2 to the atmosphere in large quantities therefore affection the atmosphere and ozone layer leading to the release of dangerous radiations.
Therefore, The changes to the Earth's atmosphere would increase the greenhouse effect and it is caused by
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Select the correct answer.
What condition should be met for the stellar parallax method to be useful?
A.
the star should be situated within the Milky Way
B.
the star should be brighter than the Sun
C.
the star should be close enough to the Sun to show a measurable parallax
D.
the star should be visible with the naked eye
Answer:
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
Explanation:
In the field of astronomy, parallax is called stellar parallax in distant stars.
The stars for which parallax measurements have been made are those that are relatively close to the sun on the galactic scale.
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
Mercury is the plant from the sun
If Object C and Object D both have the same momentum, which statement is true? Question 11 options: They both have the same velocity They both have the same mass The product of mass times velocity for both objects is the same. Mass and velocity is the same for both.
Answer:
The product of mass times velocity for both objects is the same.
Explanation:
They both have the same velocity. False
They both have the same mass. False: Because two objects of different masses can have the same momentum. The least massive of the two objects will have the greatest kinetic energy.
The product of mass times velocity for both objects is the same. True: Same momentum means that the large mass must have a small velocity; therefore, their product is equal to the small mass times a large velocity.
Mass and velocity is the same for both. False: Based on what was stated for the second option.
HELP
which two changes to a metal wire both increases resistance? the answer is B but why ?
Answer:
option C decreasing its thickness and increasing its temperature.Explanation:
Resistance is directly proportional to length and temperature of the wire and inversely to area.if you increase the temperature the resistance will increase.(resistance is directly proportional to temperature)if you decrease its thickness (area) then the resistance will increase ( resistance is inversely proportional to area)hope it helps:)
If someone has a curve in his or her spine, what other bones might also be affected by the way the curve shifts that person’s weight?
Answer:
Curve in spine can effect his or her other body parts too in addition to spine. The neck or head can be tilted forward, shoulder could be hunched, hip bone can be uneven, ribs can be effected leading to disorder of lung.
Explanation:
What will happen if the atom rearrange?
1. a new substance will form
2. start to boil
3. nothing will happen
choose the correct answer
Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange amd form new bonds to make the products.
The soprano's singing caused a drinking glass to shatter.
Explain why this happened using what you know about
resonance.
Answer:
The soprano's singing matched the natural frequency of the glass, causing it to vibrate. The strong vibrations caused the glass to shatter.
Explanation:
edg 2020
Which combustion product is a deadly gas that you cannot see or smell? O sulfur dioxide O carbon monoxide O carbon dioxide O sulfur monoxide
Answer:
carbon monoxide
Explanation:
If the net force on an object is to the left, what will the direction of the resulting acceleration
be? What will be the direction of the velocity?
Anyone please help ???
Acceleration points in the same direction as the net force, so to the left.
The direction of velocity can't be determined from this information alone, though. If the object is at rest, it will being moving to the left. If the object is already moving to the left, it will continue doing so and speed up. If it starts off moving to the right, it will continue to move to the right but eventually slow to a stop before starting to move to the left. There are more cases to consider if you're talking about motion in more than one dimension.
Please for the love of humanity please answer this question and my other question...
Answer:
It's "C"
Explanation:
Friction slows things down.
"Friction always slows a moving object down. The amount of friction depends on the materials from which the two surfaces are made. The rougher the surface, the more friction is produced. Friction also produces heat. "
Please help. to find these
Answer:
Velocity ratio & input work
Explanation:
If u input velocity u can work the ratio...;D ;D ;D xD
pllssss answer thiss ...
its about the reading of VOLTMETER AND AMMETER
Answer:
The answer is C 1.8V and 0.38A
Compare a change in temperature of 1°C to a change of 1°F.
Answer:
A change of one degree Celsius = a change of one Kelvin, but a Celsius temperature is never equal to a Kelvin temperature. A change of 1 degree Fahrenheit equals a change of 5/9 = 0.56 degrees Celsius. To convert a Fahrenheit temperature to Celsius, subtract 32 and multiply by 5/9.
Explanation:
The temperature difference in Celsius scale is greater than the temperature difference in Fahrenheit scale.
Change in temperature of 1°C = 9/5 × change in temperature of 1°F.
What is temperature?The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.
Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K).
As change in temperature of 100°C = change in temperature of 180° F
change in temperature of 1°C = change in temperature of (180/100)°F
= 9/5 × change in temperature of 1°F.
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The ball’s _______________ potential energy is transforming into more kinetic energy as the ball’s altitude is decreasing. What does that do to the speed of the ball?
Answer:
the ball's Stored energy 2. The balls altitude slowly comes to a stop going back into potential Energy
Explanation:
I need help ill give brainlyest
Answer:
Explanation: Afdjkldjf
A sled and a rider slide down a snow-covered hill that makes
an angle of 30° with the horizontal. The total mass of the sled
and the rider is 70 kg. Neglecting friction, their acceleration is
m/s2. Round to the nearest tenth.
Answer: 4.9 m/s
Explanation:
Which statement correctly describes the charge of the nucleus and the charge of the electron cloud of an atom?
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of options. However, the charge of a nucleus was discovered by Ernest Rutherford. The nucleus is located in the centre of an atom and it contains protons and neutrons. The protons are positively charged while the neutrons have no charge, thus the charge of the nucleus is positive because the neutrality of the neutron does not affect the charge of the proton.
The charge of an electron was first measured by Robert Millikan. Electrons are negatively charged subatomic particles that balance out the positive charge of the protons.