•What is the all time speed record for completing the iditarod?
Answer:
•In 2016, Dallas broke his own record, finishing in 8 days, 11 hours, 20 minutes and 16 seconds. In 2017, Mitch Seavey broke all previous records by finishing in 8 days, 3 hours, 40 minutes and 13 seconds, which currently stands as the fastest winning time for the Iditarod.
Explanation:
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What can we say about Gamma waves on
the electromagnetic spectrum?
Answer: Gamma-rays have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. These waves are generated by radioactive atoms and in nuclear explosions. Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancerous cells.
Explanation: :)
A relaxed spring of length 0. 13 m stands vertically on the floor; its stiffness is 1180 N/m. You release a block of mass 0. 5 kg from rest, with the bottom of the block 0. 7 m above the floor and straight above the spring. How long is the spring when the block comes momentarily to rest on the compressed spring?.
The length of spring when the block comes momentarily to rest on the compressed spring will be 0.054 m.The length of the spring by the letter x.
What is the potential energy of the spring?The energy is stored in the spring when it is stretched or compressed by some length. It is the product of mass, gravity and distance compressed or stretched. Mathrmatically it is given by;
PE=mgh
The given data in the problem is ;
m is the mass of the block is 0.5 kg height,
h is the height is released is 0.7 m
x initial length of the spring = 0.13 m.
K is the force constant of the spring = 1180 N/m.
By the law of conservation of energy,
The potential energy of the spring gets converted
[tex]\rm mgh=\frac{1}{2}KL^2 \\\\ \rm L= \sqrt{\frac{2mgh}{K} } \\\\ \rm L= \sqrt{\frac{2\times 0.5\times9.81 \times 0.7}{1180} \\\\ \\\\[/tex]
[tex]\rm L= 0.054m[/tex]
Hence the length of spring when the block comes momentarily to rest on the compressed spring will be 0.054 m
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A website is having a sale, and all items are 25% off the original price, p
Which expressions can be used to find the price of an item after the discount?
Select all that apply
Α.
0.75
B
1.25
CP_25
DP - 0.25
E 001P x 75
please help on answer
Answer:
D. 1
Explanation:
I believe this is the answer
a slope of length 50m rises to height of 10m above the ground .An effort of 100N is needed to push a 250N object up the ramp.calculate a.AMA b.VR c.efficiency
Answer:
Actual mechanical advantage = force out / force in
250 N / 100 N = 2.5 force out is 2.5 X force provided
250 N * 10 m = 2500 Joules work output
100 N * 50 m = 5000 Joules work input
Efficiency is 2500 / 5000 = 50 %
Not sure what is meant by VR
How to solve it? Plssss
Answer:
T1 + T2 cos 60 = 1000 cos 15 balancing x-forces
T1 + T2 / 2 = 966 (I)
1000 sin 15 + .866 T2 = 1200 balancing y-forces
259 + .866 T2 = 1200
T2 = 941 / .866 = 1087 value for T2
T1 + 543 = 966 using equation (I)
T1 = 423
Question 2 of 10
Live footage is a:
O A. person who experiences a news event.
O B. professional who reports the news.
C. series of photos taken after an event.
D. video showing an event as it happens.
SUBMIT
PREVIOUS
Explanation:
A - Journalist
B - Journalist/News reporter
C - Photography/Paparazzi
D - Videography
4 "Find shelter in a building or a metal-topped vehicle (not a convertible), and close the windows. " Based on this safety tip, what can you conclude about the safety of cars during lightning? A All cars, regardless of type, will protect you from lightning B B Cars are less safe than buildings during lightning. The rubber tires of a car protect you from lightning. D a The metal roof of a car protects you from lightning.
Answer :- Option D
Explanation:-
Coz electric field inside a conductor is zero that's why we don't get electrocuted.
Hope it helps....
How many oz are in 9080 mg
Answer:
0.32028758 oz.
Explanation:
Formula: 9080 mg, divide the mass value by 28349.5231
Which equals it 0.32028758 oz.
Answer:
0.3202876 oz
Explanation:
for an approximate result, divide the mass value by 28350
Which statements best describe half-lives of radioactive isotopes? Check all that apply.
The half-life varies depending on the isotope.
The half-life is the same for every isotope.
Half-lives are always only minutes long.
Half-lives range from fractions of a second to billions of years.
The half-life of a particular isotope is constant.
The half-life of a particular isotope changes constantly.
A,D,E
Answer:
A
Explanation:
half life is the time taken for a radioactive isotopes to dissociate
A transformer has 200.0 turns in its secondary coil and 120.0 turns in its primary coils. The primary coil is connected to a 80.00 V power supply. If 3.50 A flows in the primary coil, then how much current is there in the secondary coil
No.of primary turns/no.of secondary equal to current in primary /current in secondary therefore 200/120=3.50/C.in secondary =2.1A
When a positively charged object is brought close to 2 metal spheres that are touching, what will happen to the electrons in the spheres?.
Answer:
Let's assume the metal spheres are solid metal, and not charged beforehand.
The premise are similar, but the effect changes depending if you are approching from the side, between the spheres (left image) or the front (right image). Let's image the charged object is the tip of the arrow in the drawing, and it's small enough to be considered a point
In either case, the electron cloud in the spheres will be affected by the electric field generated by the charge, and gets attracted towards it (since the charge is positive and the electrons have by definition negative charge), moving according to the blue lines. For as long as the charge is in place, the "grouping" of charges on one side and the absence of charges on the other will create an electric dipole with the positive charge away from the side the arrived and the negative on the opposite end of the diameter.
The interesting part happens the moment you split the two spheres.
In the left case will realign based on the field lines (remember that a single charge will generate a radial field) and the moment you remove the charge the electrons are no longer drawn to one end, and will eventually re-distribute on the whole sphere, canceling the dipole.
In the right case instead, the fact that the spheres were touching allows the electrons in one of the sphere to migrate to the other, generating a net positive charge in the far sphere, and a net negative charge in the close one. if you separate the two spheres before removing the charge, the electrons are still "trapped" in the leftmost sphere, thus keeping it charged even after the original source is removed from the system.
A compact disc has a radius of 6 cm. If the disc rotates about its axis at a constant angular speed of 5 rev/s, what is the total distance traveled by a point on the rim in 40 minutes
The total distance traveled is mathematically given as
d=4.5km
What is the total distance traveled?Question Parameters:
A compact disc has a radius of 6 cm.
the constant angular speed of 5 rev/s
time 40 min
Generally, the equation for the linear speed is mathematically given as
v=w*r
Therefore
v=10 pi * 6
v=60pi cm/s
In conclusion, the equation of the distance
distance = v*t
d=60pi * 2400
d=452389.342 cm
d=4.5km
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Two learners want to confirm the principle of conservation of momentum for an isolated system. Two trolleys, with identical dimensions, but masses m and 1/2m, with a spring- loaded plunger between them, are placed on a horizontal surface. When the spring is released, it takes trolley X only 0.5 s to reach the barrier, which is 100 mm away. Trolley Y takes the same time to cover 200 mm to the other barrier.
1. Calculate the average speeds of trolleys X and Y respectively.
2 Calculate the total momentum after the release of the spring.
Based on the principle of conservation of momentum;
average speed of A is 0.2 m/saverage speed of B is 0.4 m/sthe total momentum after the release of the spring is zero.What is the principle of conservation of momentum?The principle of conservation of momentum states that in an isolated system of colliding bodies, momentum is conserved.
This principle can be stated mathematically as:
momentum before collision = momentum after collision.The average speed of each trolley is calculated using the formula:
average speed = total distance/total time takenFor Trolley A:
average speed = 100 mm/0.5 = 200 mm/s
average speed of A = 0.2 m/s
For Trolley B:
distance = 200 mm = 0.2 m
average speed = 0.2 m/0.5 s
average speed of B = 0.4 m/s
Momentum = mass × velocity
Assuming direction of motion of B is positive, direction of A is negative
Momentum of A = - m × 0.2 = -0.2m
Momentum of B = m/2 × 0.4 = 0.2 m
Total momentum = 0.2 m - 0.2 = 0
Therefore, the total momentum before and after the release of the spring is zero.
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What symbol is in the middle of the chemical equation?
an equal sign
an arrow
Answer:
the answer is An Arrow
PLEASE HELP ME
You are moving 6 books, each weighing 11 N, to a shelf 0. 8 m higher. Do you do more work by moving all 6 books at once, or by moving one book at a time?
Answer:
word done = fore * distance moved by the force, so 11n * 0.8=8.8j then 8.8 * 6=52.8j
but all the books at ones means, 6*11=66N
and 66*0.8 = 52.8j
Explanation:
The work done is equal..
Which of the following correctly arranges the planets by the size of their diameter in increasing order?
Uranus < Neptune < Mercury < Earth
Earth < Mercury < Neptune < Uranus
Mercury < Earth < Saturn < Jupiter
Jupiter < Saturn < Earth < Mercury
Answer:
Mercury<Venus<Earth<Mars<Jupiter< Saturn< Uranus<Neptune
Answer: The answer is C
Explanation: I took the test and got it right
In which does sound travel fastest? Question 8 options: solids liquids gases plasma.
Sound travels fastest in solids. A sound is a vibration that travels in a longitudinal direction through a medium in the form of a mechanical wave.
What is sound?A sound is a vibration that travels in a longitudinal direction through a medium in the form of a mechanical wave.
It can propagate through a solid, a liquid, or a gas as its medium. Solids go the fastest, liquids are slower, and gases are the slowest.
Sound travels the quickest through a solid because the molecules are packed together densely, allowing sound waves to leap from one molecule to the next more quickly.
Because the molecules in solids are packed the tightest, sound travels the quickest through them, whereas sound travels the slowest through gases.
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Answer:
solids
Explanation:
What is the power of a machine that transfers 15,000J of energy in 1 minute?
Answer:
answer is 250 W
Explanation:
W=P * t
t=60s
W= 15000J
15000= P * 60
P= 15000/60
P= 250W. (SI unit of power Watt)
The power of a machine is the rate of energy or work done by the machine. The power for 15000 J of energy in 1 minute is 250 W.
What is power?Power is a physical quantity that describes the rate of work done or energy of on an object. The work done is a vector quantity having magnitude and direction. Whereas, power is a scalar quantity.
When a force applied on a body makes its displaced, the force is said to be done work on the body. When the body do work by a restoring force then work is said to done by the body.
Work done is the product of power and time.
Given that, work done = 15000 J
time = 1 minute = 60 s
power = 15000 J /60 s = 250 W.
Therefore, the power of the machine is 250 W.
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Write a poem about how Earth's rotation causes day and night. Be sure to use
these terms: rotate, axis, sun, move, and Earth. use 16 lines
Answer:
Always on the move
Nothing stays the same
The sun comes and goes
The night you can never escape
Nothing can last for ever
Everything we know rotates
I thought this would be more clever
But it's late and I don't know what else to say
Those were eight lines only
Counting lines makes you lonely
Sixteen is a big number
I feel like I'm going under
It's always daytime somewhere
But it will never be forever
I move in circles
This poem is over
Explanation:
Sorry I thought it would end up better than this
how would the heating curve for glass be different from the heating curve for water
Answer:
The heating curve for glass would be different from the heating curve for water because water has a strange behavior while glass also has a strange behavior but is different because it lacks the repeating crystalline structure of solids like ice, or water. Glass becomes soft and impressionable as temperature increases.
Since glass lacks the repetitive crystalline structure present in solids like ice or water, its strange behavior differs from that of glass when heated. This is because glass has a unique, strange behavior than water. As temperature rises, glass becomes brittle and impressionable.
What is Heat?A difference in temperature causes energy to flow from one body to another, recognized as heat. Energy is transferred, or heat flows, when two substances of different temperatures are brought together. The hotter body goes to the cold.
Typically, though not always, this energy transfer causes the temperature of the region of lower temperature to rise and the temperature of the warmer object to fall. It is possible for a substance to absorb heat without increasing its temperature by migrating from one physical state (or phase) to another, such as melting, sublimation, boiling, or shifting from one solid form to the other.
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At what degree is the Equator
located on the globe?
Answer:
0 degrees latitude
Explanation:
At 0 degrees latitude, the Equator is an invisible line that circles the Earth's center.
Name THREE things that impact a collision.
Answer:
The three types of impact that occur are those involving the vehicle, the body of the vehicle occupant, and the organs within the body of the occupant.
Determine the Momentum of 1000 Kg car moving northward at 40 m/s .
40000 kg⋅m/s
momentum: mass * velocity
p = mv1000 * 4040000 kg⋅m/sQuestion :-
Determine the Momentum of 1000 Kg car moving northward at 40 m/s .Answer :-
Momentum of car is 40,000 Kg m/s .[tex] \rule {180pt} {2pt} [/tex]
Given :-
Mass = 1000 KgVelocity = 40 m/sTo Find :-
Momentum = ?Solution :-
As per the provided information in the given question, we have been given that the Mass of the car is 1000 Kg . Velocity of the car is given 40 m/s . And, we have been asked to calculate the Momentum of the car .
For calculating the Momentum , we will use the Formula :-
Momentum = Mass × VelocityTherefore , by Substituting the given values in the above Formula :-
⇒ Momentum = Mass × Velocity
⇒ Momentum = 1000 × 40
⇒ Momentum = 40000
Hence :-
Momentum = 40000 Kg m/s .[tex] \underline {\rule {180pt} {4pt}} [/tex]
hello! how to do this?
Answer:
B)
Explanation:
Hello everyone I would like your help on this exercise because the physics I have a little difficulty. Here is the statement:
A child launches a blue cart of mass m= 150 g in A of altitude zA= 0 on an inclined plane of an angle α = 30° with respect to the horizontal. The cart then climbs to point C where it stops before descending in reverse. This blue cart is not subject to any frictional force between A and C.
1°-What are the forces acting on the car during its journey from A to C ?
2°-What can we say about the mechanical energy of the car? Why?
3°-Determine the velocity vA with which the child launches the cart in Asknowing that the point C is at the altitude zC= 0,80 m
The child then launches a red cart of the same mass as the blue one with a speed of 4.0 m/s. This car reaches only a height of 0.55 m.
4°-Show that the mechanical energy for this red car is not conserved.
5°-Assuming that the frictional force exerted on this car during all its journey is constant, calculate the work of this force noted f.
6°-Determine then the value of f.
Data: Gravity field: g= 9,81 N/kg
Answer:
Fn = m g cos 30 = .15 * 9.81 * .866 = 1.27 N force of plane on car
Fp = m g sin 30 = .15 * 9.81 * 1/2 = .736 N force along plane
m g h = W = potential energy of car = original mechanical energy
1/2 m v^2 = m g h equating PE and KE
v^2 = 2 g h = 2 * 9.81 * .8
v = 3.96 m/s original speed of blue cart
Launch energy of red cart
1/2 m v^2 = .15 / 2 * 16 = 1.2 J launch energy of red cart
m g h = .15 * 9.81 * .55 = .81 J potential energy of red cart
Wf = (1.2 -.81) J = .39 J work done against friction
1. During the experiment with the hot metal block in cold water, in which direction did the thermal energy flow? By what method did the energy
flow?
1
When there is a temperature difference/Gradient, heat flows from a region of high concentration to region of low concentration.
Energy and Heat/Mass TransferThermal energy flow from region of higher temperature gradient to region of low temperature gradient till equilibrium is reached.
When the hot metal is places in a cold water bath, there will be a temperature difference and by conduction(water conducts heat) the heat will travel in the water medium and circulate till equilibrium
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explain why plastic comb rubbed with wool attracts pieces of paper
Answer:
Static electricity
Explanation:
Opposite charges attract each other.
Why do you think there are differences on how far two vehicles should be from each other depending on what types of vehicle they are? How does this promote road safety?
Answer:
to reduce the pace of accident
can someone please answer this, ill give you brainliest and your getting 100 points.
Answer:
I believe it's Pacific and Austrailian.
Explanation:
What's a. convergent boundary.
The place where two techtonic plates collides with each other .
Here the correct option is B
Pacific and Australia