how fast must a 1000. kg car be moving to have a kinetic energy of: (a) 2.0 x 10 3 j, (b) 2.0 x 10 5 j, (c) 1.0 kwh?
Answers
Answer: a) 2 m/s b) 20 m/s c) 84.852m/s
Explanation: the speed of a car weighing 1000kg can be measured using k=1/2 mv^2
k=kinetic energy
m=mass of car
v=velocity of car
a) 2 x 10^3 = .5 x 1000 x v^2
v =2 m/s
b) 2 x 10^5 = .5 x 1000 x v^2
v =20 m/s
c) 1 kwh = 3.6 x 10^6 J
3.6 x 10^6 = .5 x 1000 x v^2
v= 84.852 m/s
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Related Questions
A force of 100N stretches an elastic string to a total length of 20cm. if an additional force of 100N stretches the spring 5 cm further, find the natural length of the spring if the elastic limit is not exceeded. Pls help ASAP
Answers
Answer:
8cm
Explanation:
The general formula to find this is F/X where in this case the f is the total of the two forces (100+100) and x is the sum of the length ( 20+5) which together comes 200&25respectively then divide 200 with 25 which comes 8cm.
The Internet Engineering Task Force (IETF) sets standards for webpage design.
a) true
b) false
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please help lol
im on my sisters acc btw
Answers
Answer:
sitting leg curls= hamstring
shrugs=shoulders
machine curls=biceps
bench press= pectorals
the average energy released by the fission of a single atom of uranium-235 is approximately 205 mev. how much total energy would be released by the complete fission of 4.45 kg of u235 ? express your answer in units of joules. j a typical small town might use about 28.5 mw of power, on average. how long, in days, would it take this town to use the amount of energy produced by the complete fission of 4.45 kg of u235?
Answers
To find the total energy released by the complete fission of 4.45 kg of U-235, we can use the concept of energy per atom and multiply it by the number of atoms in 4.45 kg of U-235.
1. Calculate the number of moles of U-235:
Mass of U-235 = 4.45 kgMolar mass of U-235 = 235 g/molNumber of moles = Mass / Molar mass = 4.45 kg / (235 g/mol) = 0.0189 mol2. Calculate the number of atoms of U-235:
Avogadro's number (NA) = 6.022 × 10^23 mol^-1Number of atoms = Number of moles × NA = 0.0189 mol × (6.022 × 10^23 mol^-1) = 1.137 × 10^22 atoms3. Calculate the total energy released:
Average energy per atom = 205 MeV1 MeV = 1.602 × 10^-13 Joules (conversion factor)Total energy released = Average energy per atom × Number of atoms × Conversion factorTotal energy released = 205 MeV × 1.137 × 10^22 atoms × (1.602 × 10^-13 J/MeV) = 3.50 × 10^9 JoulesTherefore, the total energy released by the complete fission of 4.45 kg of U-235 is approximately 3.50 × 10^9 Joules.
Now, let's calculate how long a small town would take to use this amount of energy.
1. Determine the energy usage of the town:
Power usage = 28.5 MWConvert power to energy: 1 MW = 1 × 10^6 J/sEnergy usage per day = Power usage × 24 hours = 28.5 × 10^6 J/s × 24 hours = 684 × 10^6 J2. Calculate the number of days:
Number of days = Total energy released / Energy usage per dayNumber of days = (3.50 × 10^9 J) / (684 × 10^6 J/day) ≈ 5.11 daysTherefore, it would take approximately 5.11 days for the small town to use the amount of energy produced by the complete fission of 4.45 kg of U-235.
About MolesThe mole is a unit of account for chemistry. The unit of account is used to facilitate the calculation of an object. Count units commonly used in everyday life, for example 1 dozen equals 12 pieces, 1 gross contains 12 dozens, 1 ream equals 500 sheets of paper, 1 score equals 20 sheets of cloth. The mole concept is used to calculate the number of particles contained in a material. The particles of matter can be atoms, molecules and ions. Because the size of the atom is very small, the atomic mass is determined using a standard atom, namely carbon-12 (12C) as a comparison.
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kinds of solar power stations
Answers
Question:
A second set of data was obtained using thicker pieces of putty. Both sets of results are shown in graph 2. What is the relationship between the resistance and the thickness of the conducting putty?
Answers
The resistance of the thin wire is greater than the resistance of the thick wire because the thin wire has fewer electrons to carry the current. Therefore, for thinner pieces of conducting putty we have the larger resistance and for the thicker pieces of conducting putty we have the lower resistance.
a gardener crosses a plant with red flowers with one with white flowers. each plant is pure for its trait for flower color.
if the gene for flower colors shows incomplete dominance, what kind of coloring will the flowers on the offspring plants most likely have
Answers
A Gardner crosses the plant with red and white flowers. Each is pure of its traits. If the gene of the flower shows incomplete dominance the dominant flow gene will show the color.
They are a mix of red and white then on the basis of dominance and recessiveness. The offspring will be in pink color. Hence the option C only pink is correct.Learn more about the plant with red flowers with one with
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33] You have long hair, you should:
a
Tuck it behind your ears.
b) Pull it back into a pony tail so that it is up out of the
way.
c) Don't worry about it, most labs aren't dangerous.
Answers
Answer:
B
Explanation:
hair can be a safety hazard
If a resistor draws 1.2×10^−3 A of current from a 12 V battery, then what is the value of the resistor?
A. 10 Ω
B. 10 kΩ
C. 1.0 kΩ
D. 100 Ω
Answers
The right response is C. 1.0 k. The voltage (V) is equal to the current (I) times the resistance (R), according to the equation for Ohm's Law. R thus equals V/I. The voltage in this situation is 12 V, and the current is 1.2 10 3 A.
12 V divided by 1.2 10 3 A yields 1.0 k. As a result, the resistor has a value of 1.0 k resistance. The other responses are wrong because they do not match the value calculated in accordance with Ohm's Law.
Option A's value of 10 is too low when compared to the estimated value of 1.0 k, which is. Option B's value of 10 k is excessively high when compared to the estimated value of resistance. Option D's value of 100 is too low in comparison.
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Find the speed of the waves on an 800.0 mg violin string 21.1-cm long if the fundamental frequency is 922.0 hz.
Answers
By using the lowest resonant frequency, the wave speed is 389.084 m/s.
We need to know about the fundamental resonant frequency to solve this problem. When the string is vibrating at its lowest resonant frequency, it should follow the rule
λ = 2L
where λ is wavelength and L is length of string
From the question above, we know that
f = 922 Hz
L = 21.1 cm
By substituting to the following equation, we can calculate the wavelength
λ = 2L
λ = 2 . 21.1
λ = 42.2 cm
λ = 0.422 m
Find the speed of wave
v = λ . f
v = 0.422 . 922
v = 389.084 m/s
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a 0.29 kg harmonic oscillator has a total mechanical energy of 3.6 j. if the oscillation amplitude is 0.22 meters, what is the oscillation frequency f?
Answers
If the oscillation amplitude is 0.22m, from a 0.29kg harmonic oscillator which has a total of mechanical energy 3.6j, the oscillation frequency is 4.141Hz.
What is oscillation frequency?It is a number of oscillations in the one-time unit, says per second. For example, a pendulum that takes 0.5s to make one full oscillation has a frequency of 1 oscillation per 0.5s or 2 oscillations / second.
How to calculate the oscillation frequency?
mass (m) = 0.29kg
Total energy (E) = 3.6j
amplitude (x) = 0.22m
E = 1/2 k*x^2
k = 2*E / x^2
= 2 * 3.6 / 0.22^2
= 148.76 N/m
Frequency (v) = 1/2π √k/m
= 1/2*3.14 * √148.76 / 0.22
= 4.141Hz
Therefore, the oscillation frequency is 4.141Hz.
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what is the wavelength of the electromagnetic wave produced by your cell phone, if the frequency of that wave is 900 mhz ?
Answers
The wavelength of the electromagnetic wave produced by a cell phone with a frequency of 900 MHz is approximately 0.33 meters (or 33 centimeters).
What is the wavelength of the electromagnetic wave?The relationship between wavelength (λ), frequency (f), and the speed of light (c) can be expressed as λ = c/f. In this case, the frequency is given as 900 MHz, which is equivalent to 900 × 10⁶ Hz. The speed of light (c) is approximately 3 × 10⁸ meters per second.
Substituting the values into the equation, we get λ = (3 × 10⁸ m/s) / (900 × 10⁶ Hz), which simplifies to λ ≈ 0.33 meters (or 33 centimeters).
Therefore, the wavelength of the electromagnetic wave produced by the cell phone is approximately 0.33 meters, corresponding to the frequency of 900 mhz.
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When is the average velocity of an object equal to the instantaneous velocity? a. This is always true. b. This is never true. c. This is the case only when the velocity is constant. d. This is the case only when the acceleration is constant. e. This is the case only when the velocity is decreasing at a constant rate.
Answers
When is the average velocity of an object equal to the instantaneous velocity is C. This is the case only when the velocity is constant.
The instantaneous velocity of an object is equal to the average velocity of an object when the velocity is constant or when the acceleration is zero, this is the case only when the velocity is constant. When an object has a constant velocity, the instantaneous velocity of the object is equivalent to the average velocity of the object. This is true because the velocity of the object remains constant over time.
For example, if an object travels at a speed of 20 meters per second for a time period of 5 seconds, then the instantaneous velocity at the end of the 5 seconds is 20 meters per second, and the average velocity of the object over the 5 seconds is also 20 meters per second. This is because the velocity remained constant throughout the entire time period. Therefore, option c is correct, this is the case only when the velocity is constant.
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A ball rolls off a table and it traveling with a horizontal velocity of 2 m/s and 1 point
has a final vertical velocity of 3 m/s just before it hits the ground. How far
from the base of the table did the ball hit the ground?
Answers
Answer:
The velocity when the ball hits the ground is obtained using v2. 2 = v1. 2 + 2 g Dy with v1=0 and Dy=h. Thus solving for v2 yields 17.1 m/s v2 = 2 g h =.
21 pages·330 KB
Answer:
I e jofh ndoj eohe nc n very nic e
water is discharged through the 40-mm-diameter elbow at 0.012 m3/s. the pressure at a is 170 kpa .
Answers
The pressure at point B is 622.5 kPa.
Based on the information provided, we can determine the velocity of the water through the 40-mm-diameter elbow using the formula Q = Av, where Q is the volumetric flow rate (0.012 m³/s), A is the cross-sectional area of the elbow (πr², where r is the radius of the elbow), and v is the velocity of the water.
We can rearrange the formula to solve for v:
v = Q / A
The radius of the elbow can be determined by dividing the diameter by 2:
r = 40 mm / 2 = 20 mm = 0.02 m
The cross-sectional area of the elbow can then be calculated using the formula A = πr²:
A = π(0.02 m)² = 0.00126 m²
Substituting these values into the formula for velocity:
v = 0.012 m³/s / 0.00126 m² = 9.52 m/s
Now that we know the velocity of the water, we can use Bernoulli's equation to determine the pressure at point B:
P₁ + 0.5ρv₁² + ρgh₁ = P₂ + 0.5ρv₂² + ρgh₂
Where P₁ is the pressure at point A (170 kPa), ρ is the density of water (1000 kg/m³), g is the acceleration due to gravity (9.81 m/s2), h₁ and h₂ are the heights of points A and B above a reference level (we can assume they are the same), and P₂ is the pressure at point B (what we want to find).
Rearranging the equation and substituting in the known values:
P₂ = P₁ + 0.5ρ(v₁² - v₂²)
P₂ = 170 kPa + 0.5(1000 kg/m³)(9.522 - 02) = 170 kPa + 452.5 kPa
P₂ = 622.5 kPa
Therefore, the pressure at point B is 622.5 kPa.
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How would you describe the state of the air in the atmosphere? what kind of process does this air undergo from a cool morning toa warm
Answers
The state of the air in the atmosphere can be described as a mixture of different gases, primarily nitrogen (about 78%) and oxygen (about 21%), along with traces of other gases like carbon dioxide and water vapor. This air undergoes a process called heating or warming when transitioning from a cool morning to a warm day.
During a cool morning, the air temperature is lower, and the molecules in the air have less kinetic energy. As the sun rises and starts to heat the Earth's surface, the ground absorbs the sun's energy and warms up. This warmth is then transferred to the surrounding air through a process called conduction. The air molecules near the warm ground gain more kinetic energy and move faster.
This process, known as convection, causes the air to rise and mix with cooler air above. The warm air expands and becomes less dense, leading to a decrease in air pressure. This decrease in pressure creates an upward movement of air, forming convection currents.
As the day progresses, the sun continues to heat the ground, causing the warm air to rise even higher in the atmosphere. This process of warming the air creates a temperature gradient, with the air near the surface being warmer than the air at higher altitudes.
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a horse competing in a race accelerated from rest for 7s, at which time the horse has traveled 160m. what were the horses average and final velocities
Answers
Firstly, we need to find the acceleration of the horse. The equation for acceleration is:
a = (vf - vi)/t
where a is the acceleration, vf is the final velocity, vi is the initial velocity (which is zero in this case), and t is the time.
Rearranging this equation, we get:
vf = at
Substituting the values given in the problem, we get:
a = (vf - 0)/7
a = vf/7
vf = at
vf = a x 7
vf = (160/49) x 7
vf = 22.86 m/s (final velocity)
Now, we can use the average velocity formula to find the horse's average velocity:
average velocity = total distance traveled / total time taken
Since the horse started from rest, the total time taken is equal to the time the horse accelerated for, which is 7 seconds.
average velocity = 160 / 7
average velocity = 22.86 m/s
Therefore, the horse's average velocity and final velocity are both 22.86 m/s.
If our frame of reference was the sun would the earth be moving?
Answers
Answer:
yes, thats how it becomes morning and night
u get it
Explanation:
\in byzantine mosaics some of the tiles were placed at an angle to reflect the light. true false
Answers
True, some of the tiles in Byzantine mosaics were placed at an angle to reflect the light. This was done to enhance the visual appearance and create a dazzling effect.
Byzantine mosaics were used to decorate and embellish the walls, floors, and ceilings of buildings such as churches, palaces, and public places. They were made of small, colored, and shiny tiles called tesserae, which were arranged in various patterns to create intricate and sophisticated designs. One of the notable features of Byzantine mosaics was the use of tesserae at different angles to reflect the light and create a mesmerizing effect. The artists who created the mosaics were highly skilled and trained, and they knew how to use the properties of light to enhance their art. By placing the tiles at an angle, they could make the light bounce off the surface and produce a sparkling and radiant effect. The use of angles also allowed the artists to create depth, texture, and movement in their designs, which made them more dynamic and engaging. The Byzantine mosaics are still admired and revered for their beauty and craftsmanship, and they continue to inspire and influence artists and designers to this day.
In summary, some of the tiles in Byzantine mosaics were placed at an angle to reflect the light and create a dazzling effect. This technique was used by the artists to enhance the visual appearance and create depth, texture, and movement in their designs. The use of tesserae at different angles is one of the defining characteristics of Byzantine mosaics, and it reflects the skill and creativity of the artists who made them.
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At time t ! 0, a ball is struck at ground level and sent over level ground.The momentum p versust during the flight is given by Fig. 9-46 (with and ). At what initial angle is the ball launched
Answers
The graph leads us to conclude that the horizontal velocity of momentum is 4.0 kg/m/s. Additionally, the momentum's initial magnitude, p0, is 6.0 kg/m/s.
In physics, what is a momentum?
Momentum is characterised as the intensity of a body's motion.As momentum depends on both velocity and the orientation of the body's motion, it is quantified by "mass velocity". Since motion is a vector and mass is a scalar, momentum is a vector. Mass times speed equals momentum.
What does the word "momentum" mean?
Momentum can be viewed as a body's "power" while it is moving, or the amount of force it can exert on another body. For instance, a fastball (small mass) thrown quickly has the same inertia as a bowling ball (big mass) going extremely slowly (low velocity) (high velocity).
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A laboratory experiment requires 1300 milligrams of sugar. How many kilograms of sugar does the experiment require?
Answers
Answer:
The answer is 0.0013.
Explanation:
The answer is 0.0013 becuase the number is even and you have to divide it by ten if it is milligrams to kilograms so basically always divide by tens. Hope this is helpful <3
The experiment requires 0.0013 kg of sugar.
How conversion of milligram to kilogram is done?The milligram is the mass = 1/1,000 of gram (or) 0.0154 grains.
The milligram is an SI unit of weight where as kilogram is also a unit of weight in the metric system.In the metric system, " milli " is the prefix for 10⁻³ and " kilo " is the prefix of 10³.Abbreviation of mg - milligram, kg - kilogram.For example, 50 milligram is 50 mg and 50 kilogram is 50kg.kilograms = milligrams ÷ 1,000,000
The weight in kilograms is equal to the milligrams divided by 1,000,000.
Here,
1300 mg = ( 1300 ÷ 1,000,000) = 0.0013 kg
Hence, the answer is 0.0013 kg.
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The force of air particles over an area is_____?
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Pressure means: continuous physical force exerted on or against an object by something in contact with it.
The height, in feet, of objects launched from a pirate ship's cannon can be modelled by h=-1/5t^2 + 5t + 18 where t is the time in seconds. What is the height of the cannon where the objects are launched from?
Answers
The height of the cannon where the objects are launched from is 18 feet.
The canons of page construction are historical reconstructions, based on careful measurement of extant books and what is known of the mathematics and engineering methods of the time, of manuscript-framework methods that may have been used in Medieval- or Renaissance-era book design to divide a page into pleasing proportions. Since their popularization in the 20th century, these canons have influenced modern-day book design in the ways that page proportions, margins and type areas (print spaces) of books are constructed.
To determine the height of the cannon where the objects are launched from, we need to find the value of "h" when "t" is equal to zero.
Given the equation: h = (-1/5)×t^2 + 5×(t) + 18
Substituting t = 0 into the equation, we have:
h = (-1/5)×(0)^2 + 5(0) + 18
= 0 + 0 + 18
= 18
Therefore, the height of the cannon where the objects are launched from is 18 feet.
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Two measurments that are the same as each other are called_____?
What are they called???
Answers
Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy.
the moon orbits our earth. the opposite would never be true: the earth would never orbit the moon. one reason is due to the force of gravity. the object _________ has a greater gravitaional force and that determines what satelites orbit around it.
Answers
Answer: The moon keeps the same face pointing towards the Earth because its rate of spin is tidally locked so that it is synchronized with its rate of revolution (the time needed to complete one orbit). In other words, the moon rotates exactly once every time it circles the Earth.
A 0. 75 kg drone is flying at 15 m/s at a height of 100 m. What is the drone’s kinetic energy as it flies?.
Answers
The kinetic energy of the drone flying at a height of 100m is 8437.5J.
How to calculate kinetic energy?Kinetic energy refers to the energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed.
Kinetic energy of a body can be calculated using the following formula:
K.E = ½mv²
Where;
K.E = kinetic energym = massv = velocityAccording to this question, a 75kg drone is flying at 15 m/s at a height of 100m. The kinetic energy can be calculated as follows;
K.E = ½ × 75 × 15²
K.E = 8437.5J
Therefore, 8437.5J is the kinetic energy of the drone.
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If an object straight down falls 30m in 2 sec , how far will falls in 4 sec , what is the tail wind and headwind
Answers
Answer:
60 sec
Explanation:
60m because in every 30min in 2sec so 30 × 2= 60 min
1. How far does a skydiver fall
after they jump
out of a plane and are in free fall for
235 seconds?
Answers
Free fall without air resistance:
g=9.81 m/s²
t=235 s
h=?
h=0.5*g*t²
h=0.5*9.81*235²
h=270879m =270 km
True or False?
________________The fact that ocean crust is younger the farther away it is from an ocean ridge supports the theory of plate tectonics
Answers
Answer:
true is the answer of the question
A motorcycle enters a freeway with a speed of 5.8 m/s and accelerates uniformly for 65 m in 7.2 s.
How fast is the car moving after this time?
Answers
The speed of the motorcycle is 9.02777m/s in 7.2 sec.
What is acceleration?The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.
v(0) = 5.8
s(0)=0
s(7.2) = 65
s(t) =at^2/2 + v(0)t
s(7.2) = a(7.2)^2 + 5.8(7.2) = 65
a = (65-41.76)/51.84
a= 23.24/51.84 = about 0.4483 m/s²
v(t) = s'(t) = at +v(0) = at +5.8
v(7.2) = 0.4483(7.2) + 5.8
= 9.02777
velocity in 7.2 seconds is about 9.03 meters per second
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