Answer:
Magnetic forces are non contact forces; they pull or push on objects without touching them. Magnets are only attracted to a few 'magnetic' metals and not all matter. Magnets are attracted to and repel other magnets.
Explanation:
The highest point on the American eagle roller coaster is 39 meters above the ground. Find the potential energy of a 625 kg roller coaster car that is at its highest point on the track. Use g=10m/s
Answer:
243.75kJ
Explanation:
Step one:
Given parameters
Height= 39meters
mass= 625g
g= 10m/s
Required
The potential energy PE
Step two:
the expression for the potential energy is given as
PE=mgh
PE=625*10*39
PE=243750 J
PE=243.75kJ
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.
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.
What is a common cause of insomnia? (2 points)
Eustress
Type B personality
Chronic stress
Functional fixedness
Answer:
stress
Explanation:
Common causes of chronic insomnia include: Stress. Concerns about work, school, health, finances or family can keep your mind active at night, making it difficult to sleep. Stressful life events or trauma — such as the death or illness of a loved one, divorce, or a job loss — also may lead to insomnia.
Answer:
C. Chronic Stress
Explanation:
I took the test
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?
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.
An 190,000 W engine can accelerate from rest to a top speed in 9 s.
How much work did the engine do?

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]
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Just 4 questions, I’ll give brainiest and pts the questions are in the photo
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:
Please Help Me!!!........
Answer:
B: A material with relatively weak bonds between it's particle can be shped in to a thin sheet.
Explanation:
Plz help me
Thank you so much
Answer:
I believe its the blue, sorry if I'm wrong
A 12,500 kg railroad freight car travels on a level track at a speed of 5.2 m/s. It collides and couples with a 22,600 kg second car, initially at rest and with brakes released. What is the speed of the two cars after collision
Given :
A 12,500 kg railroad freight car travels on a level track at a speed of 5.2 m/s.
It collides and couples with a 22,600 kg second car, initially at rest and with brakes released.
To Find :
The speed of the two cars after collision.
Solution :
It is given that car couples with each other. So speed of both the cars after collision is same. Let, it be v.
Applying conservation of momentum, we get :
[tex]m_1u_1 + m_2u_2 = (m_1 + m_2 )v\\\\12500\times 5.2 + 22600\times 0 = ( 35100)v\\\\35100v = 65000\\\\v = 1.85\ m/s[/tex]
Therefore, the speed of the two cars after collision is 1.85 m/s.
How much gravitational force attracts a ball weighing 300 kilograms ?
Given that,
Mass of a ball = 300 kg
To find,
The gravitational force acting on the ball.
Solution,
The force acting on the ball is force of gravity. It is equal to the weight of the ball.
W = mg
Substitute the value of m and g in the above formula
W = 300 kg × 10 m/s²
= 3000 N
Therefore, the ball attracts with a force of 3000 N.
Air only has a density of 1.3kg/m². What is the mass of
3m^3 of air?
Answer:
m = 3.9 [m³]
Explanation:
We must remember that the density of the substance is defined as the relationship between mass over volume. That is expressed in the following equation:
[tex]Ro = m/V[/tex]
where:
Ro = density = 1.3 [kg/m³]
m = mass [kg]
V = volume = 3 [m³]
Now replacing the values.
[tex]m =Ro*V\\m = 1.3*3\\\\m=3.9[m^{3}][/tex]
Select the correct answer from each drop-down menu. What types of energy are involved in a chemical reaction? is the energy required for a chemical reaction to take place, and is the energy associated with every substance.
Box one choices are: Activation energy, chemical energy and released energy
Box 2 choices are: absorbed energy, chemical energy and released energy
Answer: box one is chemical energy and box 2 is absorbed energy
Explanation:
Answer:
CHEMICAL ENERGY AND ABSORBED ENERGY srry caps on
Explanation:
your welcomeッ
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
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]
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)
The portion of a sound wave with higher-than-normal pressure is called a(n)________
Answer:
Condensation
Explanation:
Increased pressure is called condensation or compressions because they are regions of high air pressure whilst rarefractions are low air pressure.
A water tank is filled with water up to 3.5m in height. calculate the pressure given by the tank at its bottom.
Answer:
Explanation:
We are told that the height of the water tank is 3.5 m.
Now, the formula for pressure is;
P = ρgh
Where;
ρ is density of water = 1000 kg/m³
g is acceleration due to gravity = 9.8 m/s²
h = 3.5 m
Thus;
P = 1000 × 9.8 × 3.5
P = 34300 N/m²
14. The average speed of a car was 60 m/s by the time it reached the finish line. The car moved in a straight line and traveled from the starting
line to the finish line in 8.0 sec. How far was the finish line?
What are the magnitude and direction of electric field at the center of square?
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
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
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 only planet in the solar system with the temperature that can support life is
Answer:
earth
Explanation:
its the only planet.
Which pair of waves could overlap to produce a wave with a higher amplitude
through interference?
A. Two waves of the same amplitude with crests that overlap troughs
B. Two waves of the same amplitude with crests that are perfectly
aligned
C. Two waves of different amplitudes that are also different types of
waves
D. Two waves of different amplitudes with crests that overlap
troughs
Answer: The Answer is B (Sorry if this is late)
Explanation:
I couldn’t find the answer to the question myself then found you, with no answer. So I guessed and failed my third question of the quiz, you were worth the sacrifice though ✨
The pair of waves could overlap to produce a wave with a higher amplitude through interference is that two waves of the same amplitude with crests that are perfectly aligned. Hence, option B is correct.
What is Amplitude?The maximum deflection or distance made by a point on even a vibrating object or wave relative to its equilibrium location is known as the amplitude in physics. It is equivalent to the length of a vibration path divided in half.
A pendulum's amplitude is therefore equal to the distance that the bob travels when swinging through one side to another. Vibrating sources produce waves, whose amplitude is inversely proportional to the source's amplitude.
The largest deviation of any place on the string out of its place when the line is at rest is used to determine the amplitude of a wave propagation, like the wave on such a plucked string.
Therefore, it concludes that option B is correct.
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is cereal a soup? aCTUALLY EXPLAIN WHY OR WHY NOT!
Answer:
No
Explanation:
Cereal is cereal and soup is soup.
A driver starts his parked car and within 5 seconds reaches a velocity of 54 km/hr as he
travels east. What is his acceleration?
Answer:
10.8
Explanation:
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
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
Compare these two waves!!!! RIGHT NOW I DONT HAVE ALOT OF TIME
Answer:
wave D has higher frequency then wave c
wave C has longer wavelength
wave D has a higher pitch
Explanation:
Answer: Isn't frequency the amount of times something happened? So I'd say A also E
Explanation:
(Don't rely I'm not that smart)
A force of attraction would exist between
A.
a negatively charged object and a neutral object.
B.
two negatively charged objects.
C.
a positively charged object and a negatively charged object.
D.
two positively charged objects.
Answer:
D. two positively charged objects
FILL IN THE BLANK.
The __________ of a vector is represented by the length of the arrow.
Answer:
magnitude
Explanation:
because
To open a soda can lid, a force of 50 N is applied to a car key, which acts as a lever. If the car key applies a force of 400 N to the lid, then the mechanical advantage of the car key is ___.
a 12
b 10
c 6
d 8
Explanation:
Given. Required
wo = 400N. MA=?
wi = 50N
Solution
MA = wo = 400N =8
wi. 50N
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.
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:
what is the difference between a 4x100 and a 4x400 relay