Answer:
t = 25 seconds
Explanation:
Given that,
Distance, d = 115 m
Initial speed, u = 4.2 m/s
Final speed, v = 5 m/s
We need to find the time taken in increasing the speed.
We know that,
Acceleration, [tex]a=\dfrac{v-u}{t}[/tex] ....(1)
The third equation of kinematics is as follows :
[tex]v^2-u^2=2ad\\\\\text{Put the value of a in above equation}\\\\v^2-u^2=2\times \dfrac{v-u}{t}\times d\\\\\because (a^2-b^2)=(a-b)(a+b)\\\\(v-u)(v+u)=\dfrac{2\times (v-u)d}{t}\\\\t=\dfrac{2d}{v+u}\\\\\text{Putting all the values}\\\\t=\dfrac{2\times 115}{4.2+5}\\\\t=25\ s[/tex]
Hence, it will take 25 seconds to increase the speed.
33
A microwave oven changes electrical energy to
(1 Point)
energy
radiant
thermal
Urgent
Please write the complete answer
Multiply field strength (N/kg) by mass (kg) to get weight (N)
At the start, the car is carrying
4.7 kg * (9.8 N/kg) = 46.06 N
of fuel.
At the end, it is carrying
3.0 kg * (9.8 N/kg) = 29.4 N.
Assuming the car remains completely intact, its weight was reduced by
46.06 N - 29.4 N = 16.66 N.
what do you mean by levels of professions
Answer:
your answer is.
I hope it will helpful for you
thank you
mark as brainest answer
hey can anyone pls help me out in dis !
All of the above.
For example:
A glass plate is a solid. Particles vibrate in a solid and are closely packed. together.
It doesn’t change shape if you touch it.
It doesn’t change volume like it’s water.
Answer:
D: all of the above
Explanation:
particles in a solid do vibrate but they're tightly packed and move around fixed location
The figure shows a horizontal pipe with a circular cross section whose diameter varies. The cross-sectional area at X is 3.0×10−4m2 and at Y is 0.60×10−4m2. Water of density 1000kg/m3 fills the pipe and flows through it at a constant rate of 2.4×10−4m3/s. The difference in pressure between X and Y is most nearly 750 Pa 750 Pa A 1600 Pa 1600 Pa B 7700 Pa 7700 Pa C 8320 Pa 8320 Pa D
By Bernoulli's Principle :
[tex]P_x+\dfrac{\rho v_x^2}{2}+\rho gz_x=P_y+\dfrac{\rho v_y^2}{2}+\rho gz_y[/tex]
Since , pipe is horizontal so every point is at same height .
So , [tex]z_x=z_y[/tex] .
The equation will reduced to :
[tex]P_x+\dfrac{\rho v_x^2}{2}=P_y+\dfrac{\rho v_y^2}{2}[/tex] ..... 1 )
Also flow rate will be constant :
[tex]Q=A_xv_x=A_yv_y[/tex]
[tex]v_x=\dfrac{Q}{A_x}\\\\v_x=\dfrac{2.4\times 10^{-4}}{3\times 10^{-4}}\ m/s\\\\v_x=0.8\ m/s[/tex]
[tex]v_y=\dfrac{Q}{A_y}\\\\v_y=\dfrac{2.4\times 10^{-4}}{0.6\times 10^{-4}}\ m/s\\\\v_x=4\ m/s[/tex]
Now ,
[tex]P_x-P_y=\dfrac{\rho v_y^2}{2}-\dfrac{\rho v_x^2}{2}\\\\P_x-P_y=\rho[\dfrac{ v_y^2}{2}-\dfrac{v_x^2}{2}]\\\\P_x-P_y=1000\times [\dfrac{ 4^2}{2}-\dfrac{0.8^2}{2}]\\\\P_x-P_y=7680\ Pa[/tex]
Difference in pressure between X and Y is most near to 7700 Pa.
Hence, this is the required solution.
What is measurement
This is the assignment of a number to a characteristic of an object or event, which can be compared with other objects or events.
When there are two light sources then there will be two shadows. Given below is a case where there are two light sources but one of the light sources is brighter than the other. Can you tell which shadow will be darker? Give explanation.
neither, a shadow cant be darker unless your closer to the surface your pointing the light at.
2. A race car travels a complete lap on a circular track of radius 500 m in 50 s. What is the
average velocity of the race car? (1 pt)
a. Zero
b. 100 m/s
C. 200 m/s
d. None of the above
3. In problem two. What would be the average speed? (2 pts)
1
Answer:
100m/s
Explanation:
velocity = displacement/time
The average velocity of the race car around the circular track in the given time is 62.8m/s.
Hence, option D) None of the above is the correct.
What is Average Velocity?Average velocity is simply the displacement of a particle or object over time. It is the rate of change of position of an object with respect to time.
It is expressed as;
Velocity = displacement / time
It can also be expressed as;
Velocity = circumference / time = 2πr / t
Given the data in the question;
Radius of the track r = 500mTime elapsed t = 50sAverage velocity V = ?To determine the average velocity, we substitute our values into the expression above.
V = 2πr / t
V = ( 2 × 3.14 × 500m ) / 50s
V = 3140m / 50s
V = 62.8m/s
The average velocity of the race car around the circular track in the given time is 62.8m/s.
Hence, option D) None of the above is the correct.
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A Tale f Two Elephants
1. what organisms are shown?
2. Do they look the same?
3. Do the pictures show the same species?
4. How are they similar?
5. How are they different?
Answer:
u need it now?
Explanation:
I'll answer it
Based on the diagram above, the organisms that are shown are elephants.
What is a species?A species simply refers to a biological classification of related organisms that have the same (similar) characteristics and they are capable of mating (breeding) with one another in a cycle (different seasons).
Based on the diagram above, we can logically deduce that the organisms shown are species of elephants and they look similar due to the following points:
They both have a single tail.They both have ears.They both have four legs.They both have tusk.However, an obvious difference between them is the number of tusk.
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Physical Science is the study of
Answer:
Physical science is the study of the inorganic world. That is, it does not study living things. (Those are studied in biological, or life, science.) The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.
Explanation:
write 2 examples of Base physical quantities and their standard unit
Answer:
length centimeters or meters
time seconds
Rhea kicks a soccer ball at 13 km/h to Sean. After kicking the ball, the speed of the soccer ball from Rhea’s reference frame is 13 km/h. The speed of the soccer ball from Sean’s reference frame is 22 km/h. Which conclusion is best supported by the information? A. Sean is standing still, and Rhea is running toward Sean while kicking the ball. B. Rhea is standing still after kicking the ball, and Sean is running away from Rhea. C. Both soccer players are standing still after the ball is kicked. D. Both soccer players are running while the ball is in motion.
Answer: Sean is standing still, and Rhea is running toward Sean while kicking the ball
Explanation: Your welcome :)
Answer: A:Sean is standing still and Rhea is running toward Sean while kicking the ball
Explanation:
edgen2020
An object has a mass of 17 kg and a speed of 1.28 m/s. What is the object's
kinetic energy?
Your answer
Answer: 13.9264J
Explanation: the formula for kinetic energy is ½ mv² so, we need to add our figures to the formula: ½ (17×1.28²) = 13.9264 J.
PLS HELP. A flatbed car of a train moves 8 m/s to the east. A jogger runs along to top the flatbed car (which is not very safe) with a velocity of 6 m/s to the west. How fast is the jogger moving?
Answer:
2 m/s
Explanation: Given that a flatbed car of a train moves 8 m/s to the east. A jogger runs along to top the flatbed car (which is not very safe) with a velocity of 6 m/s to the west.
Since the jogger is moving in an opposite direction to the direction of the train, and velocity is the distance covered in a specific direction, the jogger will be moving at a velocity relative to the velocity of the train.
Velocity = (8 - 6) m/s
Velocity = 2 m/s
Therefore, the jogger will be moving at the speed of 2 m/s
2. Convert 750 m/s to km/hr.
Answer:
2700
Explanation:
1m/s=3.6km/hr
a. How can a spinning ball have more lift than one that is not spinning?
Answer:
It is spinning, making the ball a little more airborn than the one that isn't spinning
Answer:
A spinning ball creates a Centrifugal Force because it is given the "energy" so to speak to spin. A ball that is not moving does not need any external energy to keep it still or, in other terms, at rest.
Explanation:
why do you think scientists put their results in data tables and graphs?
Answer:Since most of the data scientist collect is quantitative, data tables and charts are usually used to organize the information • Graphs are created from data tables • They allow the investigator to get a visual image of the observations, which simplifies interpretation and drawing
Have a nice day (^-^) ;)
5p - 14 = 8 p + 4 find p
Answer:
Explanation:
5p - 14 = 8p + 4
5p = 8p + 18 <-- Moving constants to one side; add the same number of +14 to both sides.
-3p = 18. <-- The same thing with the variable itself.
p = -6 <-- Divide both sides by negative 3.
Need help! Photo says all! Will mark brainliest :)
Answer:
number 2!
Explanation:
Answer:
2s to 4s
Explanation:
Since the graph measures acceleration over time, when the line does not move up or down is when you can see a constant velocity.
The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21ms. The total mass of the train is 825 g. find the average power delivered to the train during its acceleration.
Explanation:
Average power = change in energy / change in time
P = ΔE / Δt
P = (½ mv²) / t
P = (½ (0.825 kg) (0.620 m/s)²) / (0.021 s)
P = 7.55 Watts
In many locations, old abandoned stone quarries have become filled with water once excavating has been completed. While standing on a 10.0 m high quarry wall, Clarence tosses a piece of granite into the water below. If Clarence throws the rock horizontally with a velocity of 3.0 m/s how far out from the edge of the cliff will it hit the water?
Answer:
Explanation:
Let us calculate the time of flight first using the formula;
Velocity = Displacement/Time
Time = Displacement/speed
Time = 10.0/3
Time = 3.33secs
Next is to calculate how far out from the edge of the cliff it will hit the water. To get that, we will use the equation of motion;
S= ut+1/2gt²
u is the initial velocity = 0m/s
g is the acceleration due to gravity = 9.81m/s
S = 0 + 1/2(9.81)(3.33)²
S = 4.905*3.33*3.33
S = 54.39m
Hence it will hit the water at 54.39m from the edge of the cliff
Answer:
It will hit the water at [tex]4.28m[/tex] off the cliffExplanation:
Applying kinematic relations along vertical direction
[tex]y = V_0t + \frac{1}{2}a_yt^2[/tex]
where,
[tex]a_y = g[/tex]
therefore,
[tex]y = 0 + \frac{1}{2}gt^2[/tex]
The time taken
[tex]t = \sqrt{\frac{2y}{g}}\\\\t = \sqrt{\frac{2*10}{9.8}}\\\\t = 1.428s[/tex]
The horizontal distance
[tex]x = V_yt\\\\x = 3*1.428\\\\x = 4.28m\\\\[/tex]
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Which of the following is an example of a capital investment for a retail store? A buying ads in local newspapers B hiring sales clerks and managers C buying cash registers and displays D renting retail space at a mall
Answer:
D. renting retail space at a mall
Explanation:
Retail is the process of selling the customer goods and services by various channels of distribution to earn a profit. Capital investment includes the distinct ways in which a vendor or an individual may make the capital investment in a business. Money that is handed over as a loan or promise for the repayment.55. A dog starts at the origin and runs forward at 6 m/s for
1.5 s and then turns around to fetch the ball by
running backward at 7 m/s for 3 s. If the dog runs
back to the origin at 4 m/s, then how much time has
elapsed between the start and when he returns with
the ball?
0-
Position vs. time
61
-5
-10
Position (m)
-15
-20
-250
0.2
0.8
1.0
1.2
0.4 0.6
Time (s)
Answer:
7.5 seconds
Explanation:
Given that a dog starts at the origin and runs forward at 6 m/s for 1.5 s
From speed formula
Speed = distance/time
Substitute speed and time into the formula
6 = distance/1.5
Distance = 6 × 1.5 = 9 m
and then turns around to fetch the ball by
running backward at 7 m/s for 3 s. If the dog runs.
Calculate the distance covered
Distance = 7 × 3 = 21 m
This means that the dog ran beyond the original position.
The elapsed distance = 21 - 9 = 12m
back to the origin at 4 m/s, by covering distance 12 m
Calculate the time.
Speed = distance/time
Time = 12/4 = 3s
The time elapsed between the start and when he returns with the ball will be:
T = 1.5 + 3 × 3
T = 7.5 seconds
What is the mode of 3, 9, 11, 11, 3, 6, 2, 2, 11?
0
11
2
5,5
Answer:11
Explanation: because is the number that repeted 2 times
A moving object is in equilibrium. Which best describes the motion of the object if no forces change?
O It will change directions.
O It will slow down and stop.
O It will maintain its state of motion.
O It will speed up and then slow down.
Answer:
It will maintain its state of motion
Explanation:
The object would maintain its state of motion.
What does it mean when an object is in equilibrium?If the size and direction of the forces acting on an object are exactly balanced, then there is no net force acting on the object and the object is said to be in equilibrium.
What does equilibrium mean in physics?Equilibrium, in physics, the condition of a system when neither its state of motion nor its internal energy state tends to change with time.
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2. Elements in the same group have similar properties because they have O the same number of protons O the same number of valence electrons O the same number of energy levels with electrons O the same total number of electrons
1) Describe how the atoms of a solid differ from the atoms of a liquid.
Answer:
liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
The atoms of solids and liquids are different from each other in many ways as discussed below.
We have a solid and a liquid.
We have to describe how the atoms of a solid differ from the atoms of a liquid.
What is Atom?An Atom smallest unit into which matter can be divided without the release of electrically charged particles.
According to the question, the following differences exists between the atoms of solids and liquids -
In solids the atoms are tightly packed while in liquid they are loosely packed.In solids the density of atoms within a specific volume is very high while in liquid it can be either high or low.In solids, atoms are not free to move and they can only oscillate about their mean position while in liquid the atoms are free to move.Hence, it can be seen that the atoms of solids and liquids are quite different from each other.
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What is meant by the term work done?
How long would it take you too run the 100m sprint if from rest you accelerate at 2m/s/s for the whole race?
Answer:
10 s
Explanation:
Given:
Δx = 100 m
v₀ = 0 m/s
a = 2 m/s²
Find: t
Δx = v₀ t + ½ at²
100 m = (0 m/s) t + ½ (2 m/s²) t²
t = 10 s
A square sheet of rubber has sides that are 20 cm long. If you stretch it so that the area of the rubber is four times larger, how
long is each of the sides now?
Each side = ____cm
Answer:
40
Explanation:
The area is 400cm^2 but the area on each side is 40cm.