The answer is A. wood
because there are three different courts: clay court, grass court, and hard court. wood isn't in there so that would be the answer.
The least popular surface for a tennis court amongst the options given is wood. This is due to its high maintenance, cost, and potential for injuries.
Explanation:In the context of tennis courts, the most commonly used surfaces are grass, clay, and hard court. These surfaces are popular due to their specific impacts on the speed, spin, and bounce of the ball, thus influencing the style of play. On the other hand, wood is not a popular or commonly used surface for a tennis court. While it is possible to play tennis on a wooden court, the maintenance and cost, coupled with the potential for injuries due to slippery surface, make it an impractical option.
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A car moving at a velocity of 20 m/s (at t = 0 sec) acquires a velocity of 40m/s. If the acceleration of the car is 4 m/s2, calculate
(i) Time taken by the car to acquire the velocity of 40m/sec. (ii) Distance travelled by the car for attaining the velocity of 40m/sec.
Final answer:
The time taken by the car to reach a final velocity of 40 m/s is 5 seconds, and the distance traveled by the car during this acceleration is 150 meters.
Explanation:
To solve this physics problem, we need to use the equations of motion. Specifically, we're looking for the time (i) Time taken to reach a final velocity and the (ii) Distance traveled during this acceleration.
Calculating the Time Taken (i)
The equation to use here is v = u + at, where:
v is the final velocity (40 m/s)u is the initial velocity (20 m/s)a is the acceleration (4 m/s²)t is the time (which we are trying to find)Substituting the known values we get:
40 = 20 + 4t
t = (40 - 20) / 4
t = 5 seconds
Calculating the Distance Travelled (ii)
Now we use the equation x = ut + ½ at² to find the distance traveled, where x is the distance. With the time (t = 5s) calculated from the previous part, we get:
x = 20 × 5 + ½ × 4 × 5²
x = 100 + 50
x = 150 meters
Why do scientists agree to use one system of measurement
[ Answer ]
It would be very confusing and date and calculations would be off and inaccurate
[ Explanation ]
If scientists didn't use the SI system, then all the calculations and data they would send to each other would be mixed up and confusing. If Americans used one metric system and The Chinese used another metric system, converting the data would be inaccurate and take way to much time. Everyone would have their own idea for what is right, and no one would have a clue what other people meant.
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Which statement best describes the formation of igneous rocks?
A.Layers of dirt and other rocks are pressed together to form igneous rocks
B.Molten material cools and hardens to form igneous rocks
C.Elements in the earth form igneous rocks by compacting them together
D.Wind erodes mountains into small igneous rocks
The statement that describes the way igneous rock is formed in this question is B:Molten material cools and hardens to form igneous rocks
Igneous rocks can be regarded as type of rock that is usually formed as a result of solidification of molten rock material. It usually crystallize below Earth's surface, and after the crystallization, slow cooling follows, hence large crystals is formed.Examples of igneous rocks are:
pegmatitediabasegranitedioritegabbroigneous rocks can also be put into some categories such as base on their chemical composition and these are intermediate as well as mafic and ultramafic.
Therefore, option B
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beautiful patterns are formed in a kaleidoscope because of multiple reflection . explain and specify how it is different from a periscope by diagrams.
Periscope is a tube containing mirrors or prisms for seeing things which are otherwise not possible to see due to some obstacle. Two mirrors are aligned at 45 degrees through which light bounces off and enables the observer to see beyond the obstacle. This is specially used in submarines.
A kaleidoscope is an optical device which contains mirrors and colored glass pieces in a tube. When the tube is rotated, beautiful patterns are formed due to multiple reflections.
A ball is kicked 10 meters north , 5 meters west, 15 meters south, 5 meters east and 5 meters north. Find the total displacement and the total distance it traveled.
What happens when two forces act in the same direction?
When two forces act in the same direction, they add together. ... Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion. When you add equal forces in opposite direction, the net force is zero.
When two forces act in the same direction, their magnitudes add up to create a larger force. This results in the object moving in the direction of the resulting force with increased acceleration.
Explanation:When two forces act in the same direction, they combine or add up to create a larger force. This is known as the principle of superposition of forces. An example of this can be seen when two people push the same object in the same direction; the force exerted by the object will be the sum of the two individual forces. The object will move in the direction of the resulting force, and its acceleration will be greater than when acted on by a single force.
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A ball is throw horizontally from the top of a building 29.3 m high. The ball strikes the ground at a point 99.4 m from the base of the building. What is the time he ball was in motion
We can solve this via the kinematic equation:
[tex]h=v_{y}t+\frac{1}{2}gt^2[/tex]
Where the vertical velocity is zero and so:
[tex]h=0 \times t +\frac{1}{2}gt^2\\\\h=\frac{1}{2}gt^2\\\\t=\sqrt{\frac{2h}{g}}[/tex]
Since the height of the building is 29.3 meters then:
[tex]t= \sqrt{\frac{2(29.3)}{9.8}}\\\\t \approx 2.45s[/tex]
The ball was in motion for approximately 2.45 seconds
The ball was in motion for approximately 2.44 seconds. This was calculated using the equation for displacement in physics, considering only the vertical motion due to gravity.
Explanation:This question is about physics, specifically kinematics. In this case, we'll focus on the motion of a ball thrown horizontally from a building. Although the ball is thrown horizontally, it's also influenced by gravity, which pulls it vertically downwards.
Considering only the vertical motion, an object dropped or thrown vertically has an initial velocity of 0. The building's height gives us the displacement. We can calculate the time the ball is in motion using the equation for displacement: d = 1/2 * g * t^2, where g is the acceleration due to gravity (approximately 9.8 m/s^2).
If we plug the given data (d = 29.3 m and g = 9.8 m/s^2) into the equation, we then need to solve for 't'. The rearranged equation is t = sqrt(d / 0.5g). This gives us a time of approximately 2.44 seconds, which is the time the ball was in motion.
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if a car engine does 600,000 J of work over a 500m distance and the mass of the car is 250Kg then what is the final velocity of the car?
Given that
Work = 600,000 J ,
distance(S) = 500 m ,
mass (m) = 250 Kg ,
Determine the velocity of car (v) = ?
We know that,
Work = Force × distance
=> Force = Work ÷ distance
= 600,000 ÷ 500
= 500 N .
Also Force F = m.a ; from Newtons II law
500 = 250 × a
a = 2 m/s.
Final Velocity from the given formula
V² = u² + 2.a.s
= 0 + 2 × 2 × 500
= \sqrt{2000}
v = 44.7 m/s
I need help
How are the ecosystems pictured below similar?
A.
Grasses are the main form of vegetation.
B.
They are home to the same species of organisms.
C.
The soil is very fertile.
D.
Precipitation is distributed evenly throughout the year.
I believe the answer is A.
How much he is given out 185 g of lead cools from 200 Celsius to 10 Celsius
Given data
mass (m) = 185 g = 0.185 Kg ,
temperature (T₁) = 200°C = 200 + 273 = 473 K
temperature (T₂) = 10°C = 10+273 = 283 K
Specific haet at constant pressure (Cp) = 2.108 Kj/Kg k
Heat transfer (Q) = m.Cp.( T₂- T₁) J
= 0.185 × 2.108 × (283 - 473)
Q = -74.09 KJ
Heat rejected from ice is 74 J
If a bat hits a ball with a 1000-N force, what force does the ball exert on the bat? 500 N 0 N 1000 N 100 N
Answer:
The correct answer option is 1000 N.
Explanation:
A force is a push or a pull which acts upon any object as a result of its interaction with another object where the forces are called action and reaction.
According to Newton's third law: for every action, there is an equal and opposite reaction.
The given situation is an example of the third law of Newton. So if a bat hits a ball with a 1000-N force, the force exerted on the bat will be equal to 1000 N but in opposite direction.
If a bat hits a ball with a 1000-N force, what force does the ball exert on the bat?
A) 500 N
B) 0 N
C) 1000 N
D) 100 N
Your answer will be (C)
A bee flies at a constant rate of 5 ms until it notices a flower. It then comes to rest in 5 seconds. Find the acceleration of the bee if
a= ΔvΔt
According to all known laws of aviation, there is no way that a bee should be able to fly. Its wings are too small to get its fat little body off the ground. The bee, of course, flies anyway. Because bees don’t care what humans think is impossible.”
∆v = -5 m/s
∆t = 5 s
a = ∆v/∆t = (-5 m/s)/(5 s) = -1 m/s^2
when an object falls freely , the distance covered by the object is
a. directly proportional to time
b. directly prop. to square time
c. inversely prop. to time
d.direcly prop. to double time
Answer: b
Explanation
S = u.t + 1/2 a.t²
initial velocity is zero u = 0 ; a = g
then, S = 1/2 g.t²
S = t² since g = constant
Therefore distance is directly proportional to square of time.
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which of these is a chemical change?
paper is shredded.
gas is burned.
ice melts.
metal foil is heated.
Anything that says burned is a chemical reaction or a chemical change. Here's a burning reaction.
C2H5OH + 302 ===> 2CO2 + 3H2O
This is the equation for burning alcohol (the kind you drink). When burned, the alcohol's reaction leaves a beautiful blue flame along with CO2 and H2O on the right side.
So B is the answer.
You're not doing anything to paper if you shred it except make it smaller. It retains all of its chemical properties and almost all its physical properties.
Ice melting doesn't do anything to the water when it changes phase except you now have a puddle on the table where the ice (cube) was. But you are still dealing with water.
Metal foil is heated, again the foil is left with all its chemical properties in tact. You can reuse the foil if you are cooking potatoes in an open fire. Nothing has altered the chemical properties of the foil.
Which are made of matter? Check all that apply. air bicycles sound waves people clothes sunlight trees
Answer : The correct options are, Air, bicycles, people, clothes, trees.
Explanation :
Matter : It is made up of many particles or atoms. Matter is a substance that has mass and occupy space.
There are 3 different states of matter which are solid, liquid and gas.
From the given options, air, bicycles, people, clothes, trees are made up of matter. While the other options, sound waves and sunlight are not made up of matters.
Hence, the correct options are, Air, bicycles, people, clothes, trees.
Matter can be regarded as anything that occupy space and has weight Matter is composed of many particles as well as atoms.
The states of matter can be listed as ;
solid liquid gas.Air, bicycles as well as people and clothes and trees has weight and can occupy space hence they are mattersound waves as well as sunlight can not be regarded as matters.Light can be described as electromagnetic radiation which is made up of photon and it posses energy and momentum, it can exerts what is known as gravitational pull on other things so it's not matter.Sound waves can be regarded as one that involve propagation of a pressure wave via medium of particles. it is considered a wave, it ha not weight or occupy space hence it is not regarded as matterTherefore all options are matters except sound and sunlight
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a 1200 kg car drives west at 25m/s for 3 hours. What is the car's momentum?
The momentum of a 1200 kg car moving west at a speed of 25 m/s is 30000 kg×m/s in the westward direction.
Explanation:Momentum, in physics, is the product of the mass and velocity of an object. To calculate momentum, we multiply the mass of the object by its velocity. For a 1200 kg car moving west at a speed of 25 m/s, the momentum would be 30000 kg×m/s. Note that momentum is a vector quantity, so it has both magnitude (size) and direction. Here, the direction would be west because that's the way the car is moving.
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How much work is done by a 1000-Watt hairdryer In 40 seconds ?
Which of the following is an example of the atmosphere interacting with the biosphere?
A)Plants obtain minerals and nutrients from the soil.
B)Contaminants in lakes harm water, plants, and fish.
C)Smoke in air causes breathing difficulty in animals.
D)Water in a lake evaporates into the air on a sunny day.
The answer would be:
C. Smoke in air causes breathing difficulty in animals.
Read on if you want to know why:
When you talk about biosphere it is referring to the living organisms on Earth. Bio- means "life". When we talk about atmosphere on the other hand, we are referring to the air around us. Atmos- means "vaporous air" around us.
Using those as your clue, take the answer as an example of how to determine what spheres were interacting:
Smoke in air causes breathing difficulty in animals.
Air and animals (living organisms)
So in short we know that the atmosphere and biosphere are interacting in this scenario.
A toy car of mass 0.15kg accelerates from a speed of 10 cm/s to a speed of 15 cm/s. What is the impulse acting on the car?
A. 7.5 mN s
B. 37.5 mN s
C. 0.75 N s
D. 3.75 N s
If you could explain how you got it I would appreciate that
v=v2-v1=15-10=5 cm/s
p=mv=0.15•5=0.75 kg•cm/s
Answer : The correct option is, (A) 7.5 mN.s
Explanation :
Impulse : It is defined as the force applied to an object for a certain amount of time.
Formula used :
[tex]I=F\times \Delta t[/tex]
As we know that:
[tex]F=m\times \Delta a\\\\\Delta a=\frac{\Delta v}{\Delta t}[/tex]
Thus, formula of impulse will be:
[tex]I=m\times \Delta v[/tex]
where,
I = impulse = ?
m = mass = 0.15 kg
[tex]\Delta v[/tex] = change in speed of velocity = [tex]v_{final}-v_{initial}=15cm/s-10cm/s=5cm/s=0.05m/s[/tex] (1 m = 100 cm)
Now put all the given values in the above formula, we get:
[tex]I=(0.15kg)\times (0.05m/s)[/tex]
[tex]I=0.0075kg.m/s=0.0075N.s=7.5mN.s[/tex] (1 N.s = 1000 mN.s)
Therefore, the impulse acting on the car is, 7.5 mN.s
Sam blew out through a straw and directed his breath at a pan of sand. Sam is showing the rest of his class how the wind _________ the land.
A) erodes
B) weathers
C) forms soil from
D) deposits rocks on
Answer: Option (A) is the correct answer.
Explanation:
When a substance like sand gets carried away along with the flow of wind then this process is known as erosion.
When a substance is kept in air for too long and this exposure causes change in appearance or texture of the substance then it is known as weathering.
When rocks gets deposited on a land then this is known as deposits rocks on.
Thus, we can conclude that when Sam blew out through a straw and directed his breath at a pan of sand. Sam is showing the rest of his class how the wind erodes the land.
According to the graph, the volume of the gas is
Answer:
According to graph " Volume of the gas is directly proportional to the absolute temperature at constant pressure"
As a fact, Charles's law states that " At constant pressure the volume of fixed amount of gas is directly proportional to the absolute temperature" .Mathematically,V ∝ T at P = constant;
PLEASE HELP!!!
which of the following would be used to measure the mass of an object?
1.graduated cylinder
2. scale
3. stopwatch
4. meter stick
The answer that makes the most sense is answer choice 1... the answer definitely couldn't be scale ( answer choice 2), because mass and weight are two different things. Weight is measured on a scale and mass is is measured by using a balance, hope this helps !! :)
Answer:
A graduated cylinder measures the volume of a liquid.
Somebody help. WILL GIVE BRAINLIEST.
Answer:
1. Pour the mixture in to bucket of water - Saw dust
2. Pass a magnet through mixture - Iron pieces
3. Press the mixture through a screen - Glass marbles
4. Evaporate the water - Salt
5. Pour the mixture through a filter - Sand
6. Remove a material floating through a surface -Saw dust
HOPE THIS WILL HELP YOU
An object with an initial velocity of 3.50 m/s moves east along a straight level path the object then undergoes a constant acceleration of 1.80 m/s east for a period of 5.00 s. How far does the object move while it is accelerating
distance traveled by the object is given as
[tex]x = v_i t + \frac{1}{2} at^2[/tex]
given that
[tex]v_i = 3.50 m/s[/tex]
[tex]a = 1.80 m/s^2[/tex]
[tex] t = 5 s[/tex]
now plug in all the values above
[tex]x = (3.50)(5) + \frac{1}{2}(1.80)(5)^2[/tex]
[tex]x = 40 m[/tex]
so here it will move total distance of 40 m
The distance covered by the object while it is accelerating is 40 meters.
Given the following data:
Initial velocity = 3.50 m/s.Acceleration = 1.80 [tex]m/s^2[/tex]Time = 5.00 seconds.To determine the distance covered by the object while it is accelerating, we would apply the second equation of motion:
The second equation of motion.Mathematically, the second equation of motion is given by this formula:
[tex]S=ut+\frac{1}{2} at^2[/tex]
Where:
S is the distance.u is the initial velocity.a is the acceleration.t is the time.Substituting the given parameters into the formula, we have;
[tex]S=3.5(5)+\frac{1}{2} \times 1.80 \times 5^2\\\\S=17.5+0.9 \times 25\\\\S=17.5+22.5[/tex]
S = 40 meters.
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Yamin is running 50 feet of No. 14 wire (with a cross section of 4,110 cmils) to a load that draws current of 11 amps. What approximate voltage drop will he experience? A. 1.8 V B. 2.8 V C. 3.5 V D. 5.9 V
Resistance per 1000 feet for gauge 14 wire is given as
R = 2.525 ohm
now if wire is of length 50 feet only then the resistance is given as
[tex]R = \frac{2.525}{1000}\times 50[/tex]
[tex]R = 0.126 ohm[/tex]
now if 11 A current flows through the wire then the voltage drop is given by ohm's law
[tex]V = iR[/tex]
[tex]V = 11 \times 0.126[/tex]
[tex]V = 1.4 Volts[/tex]
so most appropriate answer in given options is
A. 1.8 Volts
HOMEWORK FOR TOMMOROW
(please help quickly)
A) A swimming pool contains 30000 kg of water at 8 celsius degrees
Specific heat capacity of water = 4181 J/kg celsius degrees
1) How much thermal energy is needed to raise the temperature of the water to 15 celsius degrees?
2) On a sunny day, the concrete at the side of the pool feels much hotter than the water, even though both have received the same thermal energy from the sun. Explain fully why the concrete is hotter
B) Describe 2 ways you could increase the efficiency of a household central heating system
(1) Use the formula
(energy E) = (specific heat capacity c) x (mass m) x (change in temperature T)
[tex]E_{thermal} = c\cdot m\cdot \Delta T= 4181 \frac{J}{kg\cdot^\circ C}\cdot 30000kg\cdot 7 ^\circ C=878010000 J\approx 0.88\cdot10^9J = 0.88GJ[/tex]
To raise the temperature of the water by 7 degrees Celsius, about 0.88GJ (Gigajoules) of thermal energy is needed.
(2) There are multiple reasons for the observation: Water and concrete have different specific heat capacity, namely that of water is about 4 times higher than one of concrete, so given the same amount of thermal energy, the temperature rises only about a quarter with water as compared to concrete. Another factor in the difference is that while it suffices to heat a relatively thin surface layer of the concrete (i.e., small volume) for it to feel hot to touch, heating the water involves heating a larger volume at a time due to its continuous mixing with lower layers (since it is a liquid with low viscosity).
(3) (a) Install thermal insulation around ducts to minimize thermal energy loss. (b) consider installing multiple heating zones to increase focus of heating to areas that need heating at a given time. (There are many other possible ways, these are just suggestions)
A train running between two towns arrives at its destination 10 minutes late when it goes 40 miles per hour and 16 minutes late when it goes 30 miles per hour. The distance between the two towns is
Well, let's see. I'll call the distance between the two towns ' D '.
Time to cover the distance = (distance/speed) . I'll call the scheduled number of hours ' t ' .
16 minutes = 4/15 of an hour, and 10 minutes = 1/6 of an hour.
So . . .
(t + 1/6) = D/40. Multiply by 4: 4t + 4/6 = D/10
(t + 4/15) = D/30. Multiply by 3: 3t + 12/15 = D/10
Great. The left sides are both equal to D/10, so we can say
4t + 4/6 = 3t + 12/15
Subtract 3t from each side: t + 4/6 = 12/15
Subtract 4/6 from each side: t = 12/15 - 4/6
Simplify the right side: t = 4/5 - 2/3
Make a common denominator: t = 12/15 - 10/15
t = the scheduled time = 2/15 of an hour (8 minutes)
Looking back up above, we found that 3t + 12/15 = D/10
Plug in 2/15 in place of 't' : 3(2/15) + 12/15 = D/10
Simplify the left side: 18/15 = D/10
Multiply by 10: D = 180/15 . . . . D = 12 miles
============================
This is such a dog of a bear of a problem, I think I ought to check my answer:
== Somewhere up above, I calculated that the scheduled time is supposed to be 8 minutes.
== Time = (distance) / (speed)
== At 40 mph, time = (12 miles) / (40 mi/hr) = 12/40 hr = 18 minutes ... 10 minutes late !
-- At 30 mph, time = (12 mi) / (30 mi/hr) = 12/30 hr = 24 minutes ... 16 minutes late !
YAY !
QED !
Unbelievable
what do we call the distance between any two successive crests of a wave
That is actually called the Wave Length.
Answer:
A wavelength
the troughs and crests are the lowest or highest points of the wave. trough to trough is the length of the wave, or wavelength. Same for crest to crest
how and when did the earth form?
Earth formed about 4.6 billion years ago out of a gigantic star explosion that gave birth to the sun and the rest of our solar system.
How do you calculate the slop of a line
The slope of a line is calculated by taking two points on the line, finding the differences in their y-values and x-values, and then dividing the change in y by the change in x.
The slope of a line is a measure of its steepness or incline and is defined as the ratio of the vertical change to the horizontal change between two points on the line. Mathematically, the slope (often denoted by the letter m) is calculated using the following formula:
[tex]\text { Slope }(m)=\frac{\text { Change in vertical direction }}{\text { Change in horizontal direction }}[/tex]
If you have two points [tex]x_1, y_1[/tex] and [tex]x_2, y_2[/tex] on the line, the formula for calculating the slope (m) is:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
Follow these steps to calculate the slope:
1) Identify the coordinates of the two points: Let the coordinates of the first point be [tex]x_1, y_1[/tex] and the coordinates of the second point be [tex]x_2, y_2[/tex].
2) Calculate the differences: Subtract [tex]y_1[/tex] from [tex]y_2[/tex] to find the change in the vertical direction, and subtract [tex]x_1[/tex] from [tex]x_2[/tex] to find the change in the horizontal direction.
Vertical change = [tex]y_2[/tex] - [tex]y_1[/tex]
Horizontal change = [tex]x_2[/tex] - [tex]x_1[/tex]
3) Plug the differences into the formula: Substitute the vertical and horizontal changes into the slope formula.
[tex]\text { Slope }(m)=\frac{\text { Change in vertical direction }}{\text { Change in horizontal direction }}[/tex]
4) Calculate the slope: Perform the division to get the numerical value of the slope.
5) Interpret the result: If the slope is positive, it indicates an upward direction from left to right. If negative, it indicates a downward direction. A slope of 0 represents a horizontal line, and an undefined slope indicates a vertical line.