Answer:
The answer is Montana...
Explanation:
Because it says 120 coal are mined in 2005...
So, thats why Montana is it...
Hope this helps.....
in a hydraulic system, piston1 has a surface area of 100cm^2 and piston 2 has a surface of 900cm^2.piston 1 exerts a pressure of 10 pa on the fluid in the hydraulic lift.
What is the fluid pressure on piston 2?
A.10pa
B.81pa
C.100pa
D.90pa
A brother and sister are riding on a merry-go-round at the park. the brother rides on the outer edge of the merry-go-round and the sister rides closer to the center. while the merry-go-round rotates with a constant angular velocity, who has the greatest centripetal (radial) acceleration?
The brother on the outer edge of the merry-go-round experiences greater centripetal acceleration due to the larger radius of his circular path.
The brother riding on the outer edge of the merry-go-round will experience greater centripetal acceleration than his sister who is positioned closer to the center. This is because centripetal acceleration depends on both the angular velocity and the radius of the path of the moving object. Since both are riding on the same merry-go-round and thus have the same angular velocity, the one farther from the center (the brother) has a larger radius, and therefore a greater centripetal acceleration.
While an airplane is in flight, four forces act on it. Thrust is caused by the airplane's propellers pushing through the surrounding air, pulling the airplane forward. Drag is caused by the air smacking into the plane's surface, pushing it backward. Lift is caused by the air rushing over the wings, pushing it upward. And weight is caused by gravity pulling the plane downward. Which force acts on the plane at a distance?
Among these 4 forces, the only force acting on the plane at a distance is weight.
In fact, weight is due to gravity, which is a non-contact force (it acts also from a distance). All the other forces, instead, are due to the contact between the plane (or parts of it) with the surrounding air: without the air, all the other 3 forces (thrust, lift, drag) would not be present, while weight would be always present.
Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock? A) 0 B) 2 C) 4 D) 8
Answer: 4
The mechanical advantage is the ratio of the force exerted by the object to the force applied to do work on it.
Here, Jeff tried to lift a rock weighing 600 pounds by wedging board under the rock. Jeff who weighs 150 pounds uses all his weight to exert force on lever and lift rock.
Mechanical advantage, [tex]M.A.=\frac{weight\hspace{1mm}of\hspace{1 mm}rock}{weight\hspace{1mm}of\hspace{1 mm}Jeff}=\frac{600 pounds}{150 pounds}=4.[/tex]
Therefore, the mechanical advantage that lever provided to Jeff in lifting rock is 4.
Get the lead out! That is really graphite in your pencil, not lead. Graphite is a form of carbon. Use the physical properties of graphite to classify it using the choices below. A) metal B) nonmetal C) metalloid D) rare Earth element
The answer to this question is B. Nonmetal
It took 1.5 hours for a bus to go from one city to the next the bus traveled at an average velocity of 52 mph, west how far apart were the two cities
Answer:
78 miles
Explanation:
The average velocity of the bus is given by:
[tex]v=\frac{d}{t}[/tex]
where
d is the displacement (the distance between the two cities)
t is the time taken
In this problem, we have
t = 1.5 h
v = 52 mph
So, we can solve the formula to find d, the distance between the cities:
[tex]d=vt=(52 mph)(1.5 h)=78 mi[/tex]
If one were 230 kilometers above sea level, one would be in the part of the atmosphere known as the ________.
Matilda has a 100 g rock sample. She knows that the rock contains uranium-238 and that the half-life of uranium-238 is 4.5 X 109 years. If she cuts the rock sample in half, what happens to the half-life of the uranium
The rock sample's half-life span remains constant. It will always be 4.5×10⁹ years no matter how many times it is cutting process.
What is uranium?Uranium, with the atomic number 92 and the symbol U in the periodic table, is a weakly radioactive element. One of the heavy metals that may be used as a concentrated energy source is uranium.
The element is found in various rocks in concentrations of 2 to 4 ppm (parts per million).
The rock sample's half-life span remains constant. It will always be 4.5×10⁹ years no matter how many times it is cutting process.
Hence the half-life of the uranium remains unchanged.
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As surface area increases, weathering rate
Which form of radiation is used to directly INCREASE the temperature of water in a nuclear reactor? A) neutrons Eliminate B) beta particles C) alpha particles D) gamma radiation
According to the second law of thermodynamics, when energy changes occur, _______ increases. question 2 options:
A ________ is a geographical area with a base transceiver station at its center.
Brass is an alloy made from copper and zinc a 0.59 kg brass sample at 98.0 is dropped into 2.80 kg of water at 5.0 c if the equilibrium temperature is 6.8 what is the specific heat capacity
Answer:
393.399 J/kg.°C
Explanation:
Specific heat capacity: This is the quantity of heat required to raise the temperature of a unit mass of a substance through a degree rise in temperature.
Heat lost by the brass = heat gained by water
CM(t₁-t₃) = cm(t₃-t₂)........................ Equation 1
Where C = specific heat capacity of the brass, M = mass of the brass, t₁ = initial temperature of the brass, t₂ = initial temperature of water, t₃ = temperature of the mixture.
Making C the subject of the equation
C = cm(t₃-t₂)/M(t₁-t₃)............................... Equation 2
Given: M = 0.59 kg, m = 2.8 kg, t₁ = 98 °C, t₂ = 5.0 °C, t₃ = 6.8 °C
Constant: c = 4200 J/kg.°C
Substitute into equation 2,
C = 2.8×4200(6.8-5.0)/0.59(98-6.8)
C = 21168/53.808
C = 393.399 J/kg.°C
Thus the specific heat capacity of the brass = 393.399 J/kg.°C
To calculate the specific heat capacity of a metal, use the heat transfer formula considering that the heat lost by the metal is equal to the heat gained by the water when they reach thermal equilibrium. By rearranging the formula, you can solve for the metal's specific heat capacity using the given mass and temperature change for both the metal and the water.
Explanation:To determine the specific heat capacity of an unknown metal, you can use the heat transfer formula:
q
= m c ΔT
where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
Since the metal and water reach thermal equilibrium, we know that the heat lost by the metal is equal to the heat gained by the water:
Heat lost by metal = Heat gained by water
mmetal cmetal (Tinitial,metal - Tfinal) = mwater cwater (Tfinal - Tinitial,water)
You can rearrange the formula to solve for the specific heat capacity of the metal:
cmetal = ⁰(mwater cwater (Tfinal - Tinitial,water)) ⁰(mmetal (Tinitial,metal - Tfinal))
Now, plugging in the values, you can calculate the specific heat capacity of the metal.
You use a pulley to lift your bike to the ceiling for winter storage. when you bought the pulley, the salesman claimed that the pulley has a mechanical advantage of 10. while lifting the bike, you notice that the pulley is squeaking because it has rusted over the summer. you determine that the pulley now has an actual mechanical advantage of 3. what is its efficiency?
3
(actually over the theoretical
Two important economic activities in Norden are _____.
The Answer is:
Agriculture and Fishing
How does the mass of a bowling ball that has been rolled down the lane affect the kinetic energy?
The answer choice is B
What is the work function of aluminium metal in kj/mol if light with = 290 nm is necessary to eject electrons?
The work function of a metal is the minimum energy required to remove an electron from the metal surface. The energy can be calculated with the given light wavelength, but additional data is needed to find the specific work function of aluminium.
Explanation:The work function of a metal is the minimum amount of energy required to remove an electron from the surface of the metal. This is a concept from the field of physics known as the photoelectric effect, commonly associated with Albert Einstein.
The energy of incident photons can be calculated using the formula E = hc/λ, where E is the energy, h is the Planck's constant, c is the speed of light, and λ is the wavelength of the light. The maximum kinetic energy of the ejected electrons, on the other hand, is given by the equation KE = E - W, where E is the energy of the incident photon and W is the work function of the metal.
Consequently, to find the work function or binding energy of a particular material, you can rearrange the equation into W = E - KE. For this specific problem though, more information would be necessary such as the kinetic energy of the ejected electrons to pinpoint the work function of aluminium metal in kj/mol specifically.
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Which type of mass movement happens very slowly?
The type of mass movement that happens very slowly is Creep.
Explanation:
Mass movement, usually known as mass wasting, is that the descent movement of a mass of surface materials, like soil, rock or mud. This mass movement generally happens on hillsides and mountains because of the influence of gravity and may happen terribly slowly or terribly quickly.
which of the following best describes a capacitor
Answer:
Two parallel metal plates that can store charge
Explanation:
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Which process can be used to power your Home? A solar thermal energy B solar electric energy C both solar thermal energy and solar electric energy D neither solar thermal energy not solar electric energy
Given the equation P2 = A3, what is the orbital period, in years, for the planet Saturn? (Saturn is located 9.5 AU from the sun.) 5 years 29 years 229 years 500 years
Answer:
B. 29 years
Explanation:
How many different elements make up beryllium sulfite, BeSO3?
3 different elements make up beryllium sulfite.
Why is it important for scientists to replicate each other’s experiments?
Answer:
A. To determine if the scientific results are repeatable
Explanation:
ow long must a simple pendulum be if it is to make exactly ten swings per second? (That is, one complete vibration takes exactly 0.200 s.)
how is the work output of a machine calculated a. by measuring the imput force b. by calculating the output distance c. by measuring the output force ny the output distance d. by dividing the input force by the output force
it is by multiplying the output force by the output distance
What type of rock is formed from the weathered remains of other rocks?
The vertical component of the projectile motion of an object depends on which of these? initial velocity or angel of trajectory
Two billiard balls of equal mass undergo a perfectly elastic head-on collision. if the speed of ball 1 was initially 2.00 m/s, and that of ball 2 was 3.00 m/s in the opposite direction, what will be their speeds after the collision? ball 1
The final velocity of the first ball is 3 m/s and the final velocity of the second ball is 2 m/s in opposite direction.
The given parameters;
mass of the billiard balls = minitial speed of the first ball, u₁ = 2 m/sinitial speed of the ball u₂ = 3 m/sApply the principle of conservation linear momentum;
[tex]m_1u_1 \ + \ m_2u_2 = m_1v_1 + m_2v_2\\\\2m - 3m = mv_1 + mv_2\\\\-m = m(v_1 + v_2)\\\\-1 = v_1 + v_2[/tex]
Apply one-dimensional velocity;
[tex]u_1 +v_1 = u_2 + v_2\\\\2 + v_1 = -3 + v_2\\\\5 + v_1 = v_2[/tex]
From the first equation, the values of the final velocity is calculated as follows;
[tex]-1 = v_1 + 5 + v_1\\\\-1 = 2v_1 + 5\\\\-6 = 2v_1\\\\v_1 = -3 \ m/s[/tex]
then, v₂ = 5 - 3 = 2 m/s
Thus, the final velocity of the first ball is 3 m/s and the final velocity of the second ball is 2 m/s in opposite direction.
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A driver speeds along a curved road and sees a fallen tree on the road. He applies the brakes but is unable to stop in time. When the car hits the tree, it slows down from 6 meters/second to 0 meters/second. What was the change in velocity during this time?
The change in velocity during the collision was _____ meters/second. need it fast
The change in velocity is the difference of the final velocity and the initial velocity:
0 – 6 = -6 m/s.