Answer:
Explanation:
All the work done by the friction force results in a transfer of energy into thermal energy of the box-floor system. This thermal energy flows as heat within the box and floor, ultimately raising the temperature of both of these objects.
You are alertly driving a car at 40 MPH (18 m/s). You come around a
bend and see a tree that has fallen across the road 50 meters away. Will
you be able to stop before you hit the tree:
a. on a dry road? Show your evidence.
b. on a wet road? Show your evidence.
Answer: A because yoir tires will grip the ground other than the wet road you will slide and go of in the ditch or go into the tree ...hope this helps
Explanation:
Which step should you take before you begin a scientific investigation? Print the directions after you complete the experiment. Test out all of the emergency equipment you may need. Clarify any confusing information in the instructions. Purchase the equipment and chemicals you will need.
Answer:
Clarify any confusing information in the instructions.
Purchase the equipment and chemicals you will need.
Explanation:
Steps of a scientific investigation include identifying a research question or problem, forming a hypothesis, gathering evidence, analyzing evidence, deciding whether the evidence supports the hypothesis, drawing conclusions, and communicating the results.
Answer:
C. Clarify any confusing information in the instructions
Explanation:
This is not a multiple choice question, however, all of these are correct. The question above is looking for the BEST step to take before beginning.
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Some drops a ball off of the top of a 125-m-tall building. In this prob-lem, you will be solving for the time it takes the ball to hit the ground.(a)Define your coordinate system, be thorough.(b)Write down the given infor-mation, be sure to include hidden information.(c)State what physics principleis at play here. How do you know this?(d)Select an equation.(e)Solve forthe time it takes for the ball to hit the ground.
Answer:
t = 5.05 s
Explanation:
This is a kinetic problem.
a) to solve it we must fix a reference system, let's use a fixed system on the floor where the height is 0 m
b) in this system the equations of motion are
y = v₀ t + ½ g t²
where v₀ is the initial velocity that is v₀ = 0 and g is the acceleration of gravity that always points towards the center of the Earth
e) y = 0 + ½ g t²
t = √ (2y / g)
t = √(2 125 / 9.8)
t = 5.05 s
IS IT right to the left a b c d
Answer:
c ok
Explanation: right?
Answer:
16
Explanation:
Do u think the benefits of nuclear energy outweigh the dangers
Answer:
While there is no such thing as 100 percent safe, having nuclear energy is much safer than you think. It's thousands of times safer than conventional coal and other fossil-fuel-derived energy, not to mention the specter of environmental disaster from continued use of carbon-based energy sources.29 may. 2011
Explanation:
I hope it helps you
A sphere of radius 10.0cm is moulded into a uniform cylindrical wire of same radius r calculate length in millimeters
Answer:
133.33 mm
Explanation:
First we need to find the volume of the sphere. The volume of a sphere is given by:
V = (4/3) * pi * r^3
With a radius of 10 cm, we have:
V = (4/3) * pi * r^3 = 4188.79 cm3
The sphere will be moulded into a cylinder, so the volume will be the same. The volume of a cylinder is:
V = pi * r^2 * h
Where h is the height of the cylinder, and for this case, it will be the length.
The radius is the same old radius, so we have:
4188.79 = pi * 10^2 * h
h = 4188.79 / 100pi = 13.3333 cm
In millimeters, we have h = 133.33 mm
Which of these questions is the best example of elasticity?
Answer:
Elastic goods and services generally have plenty of substitutes. As an elastic service/good's price increases, the quantity demanded of that good can drop fast. Example of elastic goods and services include furniture, motor vehicles, instrument engineering products, professional services, and transportation services.
Explanation:
elasticity of supply measures the responsiveness to the supply of a good or service after a change in its market price. According to basic economic theory, the supply of a good will increase when its price rises. Conversely, the supply of a good will decrease when its price decreases.
A 1 kg ball is rolling at 3 m/s.
Answer:
It will roll 9 meters in 3 seconds
Explanation:
3 m/s times 3 is 9
Thanks for warning me.
I'll be careful to stay out of its way.
Do you have a question to ask ?
Object A has a mass of 10 kg and is moving at a velocity of 2.0
m/s. So Object A's momentum is - kg. m/s.
Answer:20kgm/s
Explanation:
Mass=10kg
Velocity=2m/s
Momentum=mass x velocity
Momentum=10 x 2
Momentum=20
Momentum=20kgm/s
The object with mass m when moving with the velocity, its momentum can be calculated. The momentum of the object A is 20 kg.m/s.
What is momentum?Momentum is the product of mass and velocity of a moving object.
If the momentum is p, the mass of the object is 10 kg and the velocity is 2.0 m/s, then the momentum will be
p = 10 × 2.0
p = 20 kg.m/s
Thus, the momentum of the object A is 20 kg.m/s
Learn more about momentum.
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When using the lens equation, a negative value as the solution for d baseline i indicates that the image is
A. real
B. virtual
C. upright
D. inverted
When using the lens equation, a negative value as the solution for d baseline i indicates that the image is Virtual. The correct option is B.
What is reflection?When a light strikes on a shiny surface, it reflects back the light ray in the same medium. The phenomenon is called reflection and the ray is called the reflected ray.
From the Len's maker formula, e have
1/f = 1/u + 1/v
where f = radius of curvature /2
So, the negative value as the solution for d baseline i indicates that the image is Virtual.
Thus, the correct option is B.
Learn more about reflection.
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How does increasing the height of the counterweight affect the amount of potential energy of the counterweight?
Answer:
Explanation:
It’s because of gravitational potential energy, the higher the object is from the ground, the more potential energy due to gravity
this refers to the process of manufacturing that introduced powered machinery to the production of goods
Contrary to popular belief, America is not a Democracy, it's a Chucktatorship. In order for Chuck to rule America, he must fly around the states. His plane takes off from rest, and reaches a speed of 180 km/min in 1.5 minutes. What is the plane's acceleration?
Answer:
The plane's acceleration is 33.33 m/s²
Explanation:
The following equation relates velocity, v and acceleration of a moving body;
v = u + a·t
Where:
v = The final velocity of the body after time, t = 180 km/min
u = The initial velocity of the body just before the counting of the time = 0 m/s
a = The acceleration of the body during time, t = Required
t = The time of the motion = 1.5 minutes = 1.5×60 seconds = 90 s
v = 180 km/min = 180 km/min × 1000 m/km × 1/60 min/s = 3000 m/s
∴ 3000 m/s = 0 m/s + a × 90
[tex]a = \frac{3000 - 0 }{90} = \frac{100}{3} = 33\tfrac{1}{3} \ m/s^2[/tex]
Therefore, the plane's acceleration = 33.33 m/s².
A Nichrome (TM) wire has a resistance of 100.00 Ω at 11.5ºC. What is the resistance of at 10.0ºC ? The temperature coefficient of resistivity for Nichrome (TM) is 0.00040 (Cº)^-1.
A spherical mirror has a radius of curvature of -14 cm. What type of mirror could it be?
Answer:99.9 ohm
Explanation:
Meeta used an elastic tape to measure the length of her window to stitch a curtain. Do you think she will be able to stitch a curtain of correct measurement? Yes/No . Give scientific reason in detail, also explain the correct method to measure the length of her window.
Answer:
No
Explanation:
She will not be able to measure the length of her window accurately due to instrumental error from her choice of instrument. The elastic nature of her tape would alter the measurement because it will stretch as she is taking her readings, thus reducing the true measurement of the length of her window.
To measure the length of her window, she could use an inelastic tape rule or a metre rule. These instruments would eliminate instrumental error.
A chocolate wrapper is 6.7 cm long and 5.4 cm wide. Calculate its area up to
reasonable number of significant figures.
Chet plans an experimental investigation to see how well a new fertilizer works on daisies. The fertilizer must be dissolved in water and delivered to the plants by spraying it onto the leaves and stems.
To set up his control group for the experiment, Chet should leave out what
Answer:
The answer is D or Fertilizer, sorry for the late answer
Explanation:
Answer:
D Fertilizer hope this helps ..
Explanation:
2. A disturbance that generates a wave may be a simple pulse or shock.
b. False
a.
True
That's true.
-- a bell starts ringing (wave) when you tap it (simple pulse)
-- a pond starts rippling (wave) when a stone drops in (simple shock)
-- a guitar strings starts waving when you pluck it
Which statement is NOT an advantage of renewable resources? A They produce clean energy. B They are expensive to collect and transform into energy. C They are safe for the environment. D They replenish quickly.
Answer:
B. They are expensive to collect and transform into energy.
Explanation:
All of the other options are positive aspects of renewable resources. B is the only disadvantage of renewable resources given in the question.
Answer:
They are expensive to collect and transform into energy.
Explanation:
Edge
A trip is taken that passes through the following points in order
Point A 0 m
Point B 15.0 m
Point C -30.0 m
Point D -20.0 m
Point E 10.0 m
Point F 5.0 m
What is the distance from Point C to Point E?
answers :
20.0 m
40.0 m
-20.0 m
10.0 m
Answer:
40.0 m
...............
Answer:
35
Explanation:
Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas
v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1)
where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. Record these velocities, to two decimal places, in Table E
The first and second velocities of the car, with four washers attached to the pulley, are both 0.125 m/s.
We must apply the following calculations to determine the car's first and second velocities with the four washers attached to the pulley:
v1 = 0.25 m / t1
v2 = 0.25 m / (t2 - t1)
Here, t1 denotes the typical time needed for the car to go 0.25 metres, and t2 is the typical time needed to travel 0.50 metres.Let's say that t1 and t2 are the typical times, each lasting two seconds on average.The first formula allows us to determine v1:
v1 = 0.25 m / 2 s = 0.125 m/s
Using the second formula, we can calculate v2:
v2 = 0.25 m / (4 s - 2 s) = 0.125 m/s
Table E can be used to record these values as the velocities at the relevant distances.
for such more questions on velocities
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An elephant pushes with 2000 N on a load of trees. If it takes the elephant 45 seconds to move trees 15 meters, how much power did the elephant generate?
Answer:
Power generate by elephant = 666.67 W
Explanation:
Given:
Force = 2,000 N
Change in time = 45 Seconds
Distance = 15 meter
Find:
Power generate by elephant ?
Computation:
⇒ Work Done = Force × Distance
⇒ Work Done = 2,000 × 15
⇒ Work Done = 30,000
⇒ Power = Work Done / Time taken
⇒ Power generate by elephant = 30,000 / 45 seconds
⇒ Power generate by elephant = 666.67 W
write any two health disorders caused by noise pollution
Answer:
Cardiovascular disease, cognitive impairment, tinnitus and hearing loss
Answer:
The two health disorders caused by noise pollution are:
hearing impairmenttinnitushypertensionischemic heart diseasesleep disturbance etc.HOPE IT WILL HELP YOU
Plz mark me as brainliest....., , ..
Why is raw sewage a major pollutant in some countries but not in developed countries?
Answer:because developed cities are more equipped to deal with raw sewage than less developed cities
Explanation:
State the name of the process in each of the following changes of state:
a) Solid to a liquid
b) Liquid to a solid
c) Gas to a liquid
d) Liquid to a gas
Answer:
A. Melting
B. Freezing
C. Condensing
D. Boiling
Explanation:
Determinați numărul protonilor și cel al neutronilor în nucleul atomului
de beriliu .
Determinaţi structura nucleelor izotopilor de uraniu și de toriu Care forţe se numesc forţe nucleare. Enumeraţi particularităţile forţelor nucleare
Answer:
- Beryllium has 4 protons and 5 neutrons in its nucleus.
- The nucleus of the periodic table isotope of Uranium has 92 protons and 146 neutrons.
The nucleus of the periodic table isotope of Thorium has 90 protons and 142 neutrons.
- Check Explanation
- Check Explanation
In Romanian/In limba romana
- Berilul are 4 protoni și 5 neutroni în nucleul său.
- Nucleul izotopului tabelului periodic al Uraniului are 92 de protoni și 146 de neutroni.
Nucleul izotopului tabelului periodic al Toriului are 90 de protoni și 142 de neutroni.
- Verificați Explicația
- Verificați Explicația
Explanation:
English Translation
- Determine the number of protons and neutrons in the nucleus of the atom of beryllium.
- Determine the structure of the nuclei of the isotopes of uranium and thorium
- Which forces are called nuclear forces.
- List the peculiarities of nuclear forces.
Solution
Note that the number of protons in the nucleus of an atom is the atomic number of that atom.
And the mass number of the atom is the sum of protons and neutrons in the nucleus of the atom.
The nucleus of an atom is the most massive part of an atom containing almost exclusively the neutrons and the protons of the atom.
- Beryllium has an atomic number of 4 and a mass number of 9.
Hence, its number of protons = atomic number = 4
(Number of protons) + (Number of neutrons) = mass number
Number of neutrons
= (mass number) - (Number of protons)
= 9 - 4 = 5
- Uranium has atomic number of 92 and mass number of 238.
Number of protons = 92
Number of neutrons = 238 - 92 = 146
Thorium has atomic number of 90 and a mass number of 232.
Number of protons = 90
Number of neutrons = 232 - 90 = 142 neutrons.
- Nuclear forces are the forces that keep the neutrons and protons of an atom bonded to the nucleus of an atom. The constituents of the atom's nucleus are called nucleons. Nuclear forces are the forces between two or more nucleons.
- The nuclear forces are about 10 million times stronger than the forces that bind atoms together in molecules and compounds.
Hence, massive energies are required to break into the nucleus of atoms.
This is why nuclear reactors produce about a million times more energy per kilogram fuel compared to chemical fuel.
However, the range of the nuclear force is short, only about 10⁻¹⁵ m, beyond which it decreases rapidly.
This is why, in spite of its enormous strength, we do not feel anything of this force on the atomic scale or in everyday life.
In Romanian/In limba romana
Rețineți că numărul protonilor din nucleul unui atom este numărul atomic al acelui atom. Și numărul de masă al atomului este suma protonilor și neutronilor din nucleul atomului. Nucleul unui atom este partea cea mai masivă a unui atom care conține aproape exclusiv neutroni și protonii atomului.
- Beriliu are un număr atomic de 4 și un număr de masă de 9.
Prin urmare, numărul său de protoni = numărul atomic = 4
(Număr de protoni) + (Număr de neutroni) = număr de masă
Numărul de neutroni = (număr de masă) - (Număr de protoni) = 9 - 4 = 5
- Uraniul are numărul atomic de 92 și numărul de masă de 238.
Numărul de protoni = 92
Numărul de neutroni = 238 - 92 = 146
Toriul are un număr atomic de 90 și un număr de masă de 232.
Numărul de protoni = 90
Numărul de neutroni = 232 - 90 = 142 neutroni.
- Forțele nucleare sunt forțele care mențin neutronii și protonii unui atom legați de nucleul unui atom.
Constituenții nucleului atomului se numesc nucleoni. Forțele nucleare sunt forțele dintre doi sau mai mulți nucleoni.
- Forțele nucleare sunt de aproximativ 10 milioane de ori mai puternice decât forțele care leagă atomii împreună în molecule și compuși.
Prin urmare, energiile masive sunt necesare pentru a pătrunde în nucleul atomilor.
Acesta este motivul pentru care reactoarele nucleare produc aproximativ un milion de ori mai multă energie pe kilogram de combustibil în comparație cu combustibilul chimic.
Cu toate acestea, domeniul forței nucleare este scurt, doar aproximativ 10⁻¹⁵ m, dincolo de care scade rapid.
Acesta este motivul pentru care, în ciuda puterii sale enorme, nu simțim nimic din această forță pe scara atomică sau în viața de zi cu zi.
Hope this Helps!!!
Sper că acest lucru vă ajută!!!
Chris has a part time job as a cannon ball catcher for the circus. One day he was located an unknown distance away from the cannon. A cannonball was fired from the cannon at 425 m/s. The speed of sound was 345 m/s. Unfortunately the cannonball went past Chris 0.20 s before he heard the sound of the blast. How far away was the cannon from Chris?
show work with answer for brainliest plz
Answer: 366.56 meters.
Explanation:
Velocity of the cannon ball = 425m/s
Velocity of sound = 345 m/s
For the "position" of both, we have the equation:
Pc = 425m/s*t
Ps = 345m/s*t
Where t is time in seconds.
If the position of Chris is X, we have that if the ball reaches the position of Chris in T seconds, then the soundwave reaches the position of Chris in T + 0.20 seconds, we can write this as:
425m/s*T = X
345m/s*(T + 0.20s) = X
Now we can solve this system of equations. First we can replace the first equation in the second equation and get
345m/s*(T - 0.20s) = 425m/s*T
Now we solve this for T.
345*T + 69 = 425*T
69 = (425 - 345)*T = 80*T
T = 69/80 = 0.8625 seconds.
Now we replace this in the first equation and get:
X = 425m/s*T = 425m/s*0.8625s = 366.56 meters.
Rohit placed a pencil perpendicular to principal axis in front of a converging
mirror of focal length 30 cm. The image formed is twice the size of the pencil.
Calculate the distance of the object from the mirror.
Answer:
45 cm ( in my opinion)♀️
Explanation:
( Using the mirror formula)
1/ u + 1/v = 1/f
( introducing magnification; m into the formula )
u( 1/u + 1/v ) =u×1/f
1 + u/v =u/f
( But u/v =1 ÷v/u= 1/m)
1 +1/m =u/f
(Supposing m is actually equal to 2, and f =30 cm, then;)1 + 1/2 =u/30
2+1= u/15
3=u/15
3×15=u
45 cm=u
El coeficiente de variación de la resistencia con la temperatura del carbón es -0.0005/°c.Si la resistencia de una resistencia de carbón es de 1000 a0°c , determine su resistencia a 120°c
Answer:
R (120) = 940Ω
Explanation:
The variation in resistance with temperature is linear in metals
ΔR (T) = R₀ α ΔT
where α is the coefficient of variation of resistance with temperature, in this case α = -0,0005 / ºC
let's calculate
ΔR = 1000 (-0,0005) (120-0)
ΔR = -60 Ω
ΔR = R (120) + R (0) = -60
R (120) = -60 + R (0)
R (120) = -60 + 1000
R (120) = 940Ω
Hydrogen is a nonmetal with many nonmetal properties. Why is it on the periodic table with the metals in Group 1?
Answer:
This is because it has ns1 electron configuration like the alkali metals.
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