Answers
Answer:
I believe its the blue, sorry if I'm wrong
Related Questions
A wrench is accidentally dropped from the top of a mast on a sailboat. Will the wrench hit at the same place on the deck whether the sailboat is at rest of moving with a constant velocity
Answers
Answer:
Yes, because the wrench is moving at the same speed as the sailboat.
The main difference is that a person on the ground would see the wrench moving diagonally, while a person on the boat would see the wrench falling straight down,
This difference in paths lead to the relativistic change in lengths.
A Stone thrown from the top of a building is given an initial velocity Of 20.0 metre per second straight upward determine the time in second at which the stone reaches its maximum height. ( Take sec2 g=9.8m/s)
A) 2.8
B) 2.04
C) 1.67
D) 2.7
Answers
We know that,
[tex]{\boxed{\sf{v=u+gt}}}[/tex]
[ Put values ]
[tex]\begin{gathered} \implies \sf \: {0} \: = {20} + ( - 9.8) \times t \\ \\ \implies \sf \: 0 = 20 - 9.8t \\ \\ \implies \sf \: 9.8t = 20 \\ \\ \implies \sf \: t = \dfrac{20}{9.8} \\ \\ \implies \sf \: t = 2.04\end{gathered}[/tex]
Therefore, the time at which the stone reaches its maximum height will be 2.04 s.
A student slides a rock along the flat surface of a frozen pond. The rock starts to slow down after several seconds. Construct an explanation using Newton's Laws that describes why the rock begins to decelerate.
Answers
Answer:
When the student slides the rock along the flat surface of the frozen pond, according to Newton's second law of motion, the rock is given an initial velocity of motion. According to Newton's first law of motion, the rock will continue to slide indefinitely unless it is slowed or stopped by an opposite force. According to Newton's third law, the rock experiences a reaction force from the force of friction of the ice which slows it down at a rate given by Newton's second law of motion and the rock is seen to decelerate
Explanation:
Newton's first law of motion, states that an object will remain at rest or maintain a uniform motion in a straight line, unless impressed upon by an external force
Newton's second law states that an applied force is equal to the rate of change of momentum it produces
Newton's third law states action and reaction are equal and opposite.
A student places two books on a table. One book weighs less than the other book
Which book has less potential energy (PE)? *
(10 Points)
Answers
The propeller of an aircraft is spinning at 10 rev/s when the pilot shuts off the engine. The propeller reduces its angular velocity at a constant 2.0rad/s2 for a time period of 40 s. What is the rotation rate of the propeller in 40 s
Answers
One revolution of the propeller corresponds to a rotation of 2π radians, so that the propeller has an initial angular velocity of
10 rev/s = (10 rev/s) • (2π rad/rev) = 20π rad/s
The propeller thus has an angular velocity ω at time t of
ω = 20π rad/s - (2.0 rad/s²) t
so that at t = 40 s, its angular speed is reduced to
20π rad/s - (2.0 rad/s²) (40 s) = (20π - 80) rad/s
Convert this to a rotation rate by dividing this result by 2π :
(20π - 80) rad/s = ((20π - 80) rad/s) • (1/(2π) rev/rad) ≈ -2.73 rev/s
which would suggest that the propeller has started to turn in the opposite direction at a rate of 2.73 rev/s.
Someone can help me pls
Is physical science class
Answers
Answer:
I can't see the picture
Explanation:
A cyclist travelled 32 kilometers for both the 1st and 2nd hours. He took a 30 minute break to eat his lunch. He then travelled 15 kilometers for the final 3rd hour. What is the cyclist's average speed?
Answers
Answer:
The cyclist's average speed is 13.43 [tex]\frac{km}{h}[/tex]
Explanation:
Speed is a quantity that expresses the relationship between the space traveled by an object and the time used for it. That is, speed is the magnitude that expresses the variation in position of an object and as a function of time, which would be the same as saying that it is the distance traveled by an object in the unit of time.
Average speed relates the change in position to the time taken to effect that change:
[tex]speed=\frac{change in position}{time} =\frac{distance}{time}[/tex]
In this case:
total distance traveled= 32 km + 15 km= 47 kmtotal time= 3 hours that the cyclist travels + 30 minutes of rest = 3 hours + 0.5 hours (being 60 minutes equal to 1 hour, then 30 minutes equals 0.5 hours) = 3.5 hoursReplacing:
[tex]speed=\frac{47 km}{3.5 h}[/tex]
and solving, you get:
speed= 13.43 [tex]\frac{km}{h}[/tex]
The cyclist's average speed is 13.43 [tex]\frac{km}{h}[/tex]
The creation of electricity in a coil of a wire through the movement of a magnet is called what?
A) electromagnet
B) Magnetosphere
C) Magnetism
D) Electromagnetic Induction
Answers
Answer:
D. Electromagnetic Induction.
Explanation:
A 75-kg man is riding in a 30-kg cart at 2.0 m/s. He jumps off in such a way as to land on the ground with no horizontal velocity. The resulting change in speed of the cart is:
Answers
Answer:
Explanation:
We shall apply law of conservation of momentum .
M and m be mass of man and boat . V and v be velocity of man and boat .
MV = mv
75 V = 30 v
2 .0 m/s is relative velocity of man wrt boat .
Given v + V = 2
V = 2 - v
75 ( 2 - v ) = 30 v
150 - 75 v = 30 v
150 = 105 v
v = 1.43 m /s
A child shoots a ball with a slingshot off the roof of a skyscraper at an angle paralle with the ground. The ball has an initial velocity of 10 m/s. After the ball travels for 5 seconds how much fast will it be traveling? ((I don't know need help
Answers
Answer:
Not accounting for friction, the ball would be falling at 14.0 m/s
Explanation:
Without a coefficient of kinetic friction being provided, we'll have to assume zero friction between the ball and the air.
In that case, the ball's horizontal speed will remain 10 m/s. To find it's velocity in five seconds then, we just need to take gravity into account.
Let's assume acceleration from gravity is 9.8 m/s². We can simply multiply that by five seconds to find out how fast it's going at that point:
[tex]9.8\frac{m}{s^2} \times 5s\\= 49 \frac{m}{s}[/tex]
So at five seconds, the ball is moving horizontally at 10 m/s and vertically at 479 m/s.
Now we can simply take the hypotenuse between those two vectors to get the actual speed:
[tex]s = \sqrt{9.8^2 + 10^2}\frac{m}{s}\\s = \sqrt{96.04 + 100}\frac{m}{s}\\s = \sqrt{196.04}\frac{m}{s}\\s = 14.0 \frac{m}{s}\\[/tex]
So lacking air to slow it down, the ball would be going at approximately 14.0 metres per second.
The portion of a sound wave with higher-than-normal pressure is called a(n)________
Answers
Answer:
Condensation
Explanation:
Increased pressure is called condensation or compressions because they are regions of high air pressure whilst rarefractions are low air pressure.
According to the cell theory, which statement is correct? A) Viruses are true cells. B) Cells are basically unlike in structure. C) Mitochondria are found only in plant cells. D) Cells come from preexisting cells.
Answers
Answer:
D) Cells come from preexisting cells.
Explanation:
The universal i.e widely accepted cell theory was proposed in 1800's by the contribution of three scientists namely Theodor Schwann, Matthias Schleiden, and Rudolf Virchow. They came together and proposed three main components that make up the cell theory today. The components are:
- All living things are composed of one or more cells.
- Cell is the basic and fundamental unit of life
- All cells come from preexisting cells.
Based on these three components of the cell theory, the statement that: "Cells come from preexisting cells" in the options is correct.
An 190,000 W engine can accelerate from rest to a top speed in 9 s.
How much work did the engine do?

Answers
We have that the work the engine did is
w=1710000J
From the Question we are told that
Power P=190,000 W
T= 9 s
Generally the equation for the work is mathematically given as
[tex]w=pt\\\\w=190,000*9s\\\\w=1710000J[/tex]
For more information on this visit
https://brainly.com/question/21231013?referrer=searchResults
8. A jaguar runs 4200 meters at the speed of 400 meters per minute. How
much time did this take? (You can use the speed triangle if it helps! Write
the formula, plug in the numbers, and write the answer with a box around it
Answers
Answer:
10.5min
Explanation:
Given parameters:
Distance = 4200m
Speed = 400m/min
Unknown:
Time taken for this run = ?
Solution:
Speed is the distance divided by the time taken.
Speed = [tex]\frac{distance }{time }[/tex]
Time = [tex]\frac{distance}{speed }[/tex]
Now insert the parameters and solve;
Time = [tex]\frac{4200}{400}[/tex] = 10.5min
What happens to the temperature during an endothermic reaction? ANSWERS; The temperature stays constant. The temperature will decrease (get colder). The temperature will increase (get warmer)
Answers
Answer:
The temperature will decrease (get colder).
Explanation:
Enthalpy changes are heat changes accompanying physical and chemical changes. The enthalpy change is the difference between the sum of the heat contents of products and the sum of heat contents of reactants.
For an endothermic change, heat is absorbed for the reaction. The surrounding becomes colder at the end of the reaction and so is the reaction itself. The right choice is that the temperature will decrease.A friction-less pulley in the shape of a solid cylinder of mass 2.90 kg and radius 30.0 cm is used to draw water from a well. A bucket of mass 1.90 kg is attached to a cord wrapped around the cylinder. If the bucket starts from rest at the top of the well and falls for 3.70 seconds before hitting the water, how deep is the well
Answers
Answer:
[tex]s=-38.332m[/tex]
Explanation:
From the question we are told that
Cylinder of mass [tex]m=2.90 kg[/tex]
Radius [tex]R=30.0 m[/tex]
Mass of bucket [tex]M_b= 1.90 kg[/tex]
Fall time [tex]T_f= 3.70 seconds[/tex]
Generally the tension the bucket is mathematically given by
[tex]T-mg=ma[/tex]
For cylinder
[tex]T=I*\alpha[/tex]
where
[tex]I=1/2mR^2[/tex]
[tex]a=R*\alpha[/tex]
Giving
[tex]T=-1/2mR\alpha[/tex]
Therefore
[tex]a=\frac{-mg}{m+1/2m}[/tex]
[tex]a=\frac{-(1.9*9.81)}{1.9+0.5*(2.9)}[/tex]
[tex]a=-5.563880597 \approx -5.6m/s^2[/tex]
Generally the Newton's equation for motion is mathematically represented as
[tex]s=ut+1/2at^2[/tex]
[tex]s=0(3)+1/2*-5.6*(3.7)^2[/tex]
[tex]s=-38.332m[/tex]
Using the rules for significant figures, what do you get when you multiply 67.6 by 1.2?
Answers
Answer:
81
Explanation:
The problem here is to use the rules for significant figures in the multiplication below.
67.6 x 1.2:
This product will yield an answer that will produce the least number of significant figures.
67.6 has 3 significant figures; 6, 7 and 6
1.2 has 2 significant figures; 1 and 2
The product must give us an answer of two significant figures:
67.6 x 1.2 = 81.12 to 2significant figures gives 81
The solution to this problem is 81
what do you think president biden should say in his inaugural speech to unify the country’s
Answers
Answer:
If you haven't heard, Joe Biden would like to unite America.
It was a focus of the Democrat's campaign. It's even the theme of Biden's inauguration — "America United."
The inaugural committee says the slogan "reflects the beginning of a new national journey that restores the soul of America, brings the country together, and creates a path to a brighter future."
If only it were that easy.
When Biden is sworn in at 12:01 p.m. ET Wednesday as the 46th president of the United States, it will be with the understanding that the country is as divided as it's ever been, as pessimistic as it's been in three decades and facing health, economic and racial crises.
It will also be a very different inauguration than has ever been seen in U.S. history. Four years ago, President Trump was arguing over his crowd size compared with Barack Obama's record-setting turnout of supporters on the National Mall.
Explanation:
btw i would rather have him as president
An object with mass 'm' is moving in a circle of radius 'R' at a constant speed of 'v.' The acceleration of the object will INCREASE if _____. List all that apply ... .
Answers
Answer:
Explanation:
The acceleration of an object is given by the formula
a = v²/r
The acceleration of the object is bound to increase, if and only if the following are changed as well.
The mass of the object is increased,
The speed of the object is increased,
The radius of the object is contrarily decreased
Taking another look at the formula, we see that if we increase the speed of the object, it increases the acceleration. And since the radius is in the denominator, it has to be reduced for the acceleration to increase
The images below are models that represent the reactants and products of a chemical reaction.
Reactants Products
Based on the models, was mass conserved in this chemical reaction?
A.
No, because the purple atom formed two bonds in its reactant molecule and only one bond in its product molecule.
B.
No, because the reactants are made up of different types of molecules than the products.
C.
Yes, because the number of reactant molecules is the same as the number of product molecules.
D.
Yes, because the number of each type of atom is the same in the products as it is in the reactants.
Answers
Explanation:
In a chemical reaction, when mass is conserved , the number of atoms or moles of the reactants must be equal to the number of moles or atoms in the products side.
From the diagram, we should carefully look to see if the number of atoms that makes up the reactants are equal to those on the product side.
For example:
A + B → AB
Here, mass is conserved because, on the reactant side, we have 1 atom of A and on the product side we have 1 atom of A
For B, on the reactant side, we have 1 atom of B and on the product side, we have 1 atom of B.
Answer:
Yes, because the number of each type of atom is the same in the products as it is in the reactants.
Explanation:
Just 4 questions, I’ll give brainiest and pts the questions are in the photo
Answers
Answer:
1. Divide the weight by speed of the people pushing it to get net force
2. Whether one side of the object is pushing harder or not you will get ur answer, for example if the left side is pushing 3 newtons to the right and the right side pushing 5 newtons to the left, the net force would be 2 newtons of force pushing left and if its an even amount of force then it will be 0
3. If one side of an object pushes harder than the other side, then the object will move in favor of the one who is pushing harder.
4. 200 newtons or 200N
Explanation:
100 point question!! A driver begins to brake when her car is traveling at 15.0 m/s, and the car comes to a stop 4.0 s later. How much farther does the car go after the driver begins to brake, assuming constant acceleration?
Answers
Answer:
30 m
Explanation:
Let's list out the known variables that we are given in this question.
v₀ = 15 m/sv = 0 m/s t = 4 sWe are trying to solve for displacement in the x-direction.
Δx = ?Find which constant acceleration equation contains all 4 of these variables.
[tex]\displaystyle \triangle x = \Big (\frac{v+v_0}{2} \Big ) t[/tex]Plug the known values into the equation and solve for delta x.
[tex]\displaystyle \triangle x = \Big (\frac{0+15}{2} \Big ) \cdot 4[/tex] [tex]\displaystyle \triangle x = \Big (\frac{15}{2} \Big ) \cdot 4[/tex] [tex]\displaystyle \triangle x =\frac{60}{2}[/tex] [tex]\triangle x = 30[/tex]The car goes 30 m after the driver begins to brake.
Answer:
the answer should be 30 m
Explanation:
have a good day
A force of 100.0N accelerates a 5.0 kg box at 15.0 m/s^2 along a level surface. Find the coefficient of sliding friction for the box. After that, how far will the box have gone after 5.0 seconds of pulling it?
Answers
By balancing the force, we get :
100 - Frictional Force = ma
100 - μmg = ma
100 - μ(5)(10) = (5)(15)
50μ = 25
μ = 0.5
Distance travelled by box in 5 seconds is :
[tex]d = ut + \dfrac{at^2}{2}\\\\d = 0 + \dfrac{15\times 5^2}{2}\\\\d = 187.5\ m[/tex]
Hence, this is the required solution.
Please Help Me!!!........
Answers
Answer:
B: A material with relatively weak bonds between it's particle can be shped in to a thin sheet.
Explanation:
2. A 0.8 kg tetherball hangs on the end of a cord. It is hit by a child and rises 2.1 m above the ground. a. What is the maximum gravitational potential energy of the ball?
Answers
Answer:
E = 16.464 J
Explanation:
Given that,
Mass of tetherball, m = 0.8 kg
It is hit by a child and rises 2.1 m above the ground, h = 21. m
We need to find the maximum gravitational potential energy of the ball. The formula for the gravitational potential energy is given by :
E = mgh
g is acceleration due to gravity
E = 0.8 kg × 9.8 m/s² × 2.1 m
= 16.464 J
So, the maximum potential energy of the ball is 16.464 J.
A pipe that is open at both ends has a fundamental frequency of 320 Hz when the speed of sound in air is 334 m/s. What is the length of this pipe
Answers
Answer:
Length of pipe 0.5m
Explanation:
Step one
Given data
fundamental frequency of 320 Hz
n=1
Velocity v=334m/s
Note: the subsequent frequency of sound are a multiple of it fundamental frequency
Step two
Applying the formula we have
Fn=nv/2l
Substitute
320=1*334/2L
Cross multiply
320*2L=334
640L=334
Divide both sides by 640
L=334/640
L=0.5m
Which item rotates in a magnetic field as an electric motor produces kinetic energy.
A. Lightbulb
B. Loop of wire
C. Battery
D. Permanent magnet
Answers
Answer:
Loop of Wire
Explanation:
The only planet in the solar system with the temperature that can support life is
Answers
Answer:
earth
Explanation:
its the only planet.
What happens to distance when velocity is doubled
Answers
What are the magnitude and direction of electric field at the center of square?
Answers
Answer:
hello the diagram related to this question is missing attached below is the missing diagram
Answer :
The magnitude of the electric field = 4KQ / L^2
direction = 45° east to south
Explanation:
The magnitude of the electric field = 4KQ / L^2
direction = 45° east to south