Answer:
So work require will be 3888×10×10³J
Explanation:
⇒Work done=Change in kinetic energy
⇒KE=1/2mv²
⇒Mass->15000kg
⇒Velocity->72km/h
⇒KE=1/2×15000×(72)²
⇒KE=1/2×15000×5184
⇒KE=7500×5184
⇒KE=3888×10×10³J
Calculate the velocity of:
A bus travelling through town, with a mass of 5040 kg and kinetic energy of
493,900 J.
Answer:
solution
given,
mass(m)=5040kg
kinetic energy(ke)=493,900
velocity(v)=?
[tex]ke = \frac{1}{2} mv {}^{2} \\ 493900 = \frac{1}{2} \times 5040 \times v {}^{2} \\ 493900 = \frac{5040v {}^{2} }{2} \\ 493900 = 2520v {}^{2} \\ v {}^{2} = 196 \\ v = \sqrt{196} \\ v = 14ms {}^{ - 1} [/tex]
When an object moves from one point to other point, it possess the energy which is called the Kinetic energy of the object.
The velocity of he bus is 14 m/s.
Given that, a bus travelling through town, with a mass of 5040 kg and kinetic energy of 493,900 J.
So the kinetic energy expressed by the formula given below.
[tex]k=\dfrac {1} {2}mv^2[/tex]
Where, [tex]k[/tex] is the kinetic energy in joules, [tex]m[/tex] is the mass of object in kilograms and [tex]v[/tex] is the velocity of the object in meter per second.
So the velocity of the bus can be calculated by substituting the values in above formula.
[tex]493900=\dfrac{1}{2}\times5040\times v^2[/tex]
[tex]v^2=196\\\\v=\sqrt{196}\\v=14\;\rm m/s[/tex]
The velocity of he bus is 14 m/s.
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the velocity of a car changes from 20 m/s east to 5 m/s east in 5 seconds. What is the acceleration of the car?
Answer:
3 m/s²
Explanation:
Acceleration = Change in velocity/ time
= (20 - 5) / 5
= 3 m/s²
Some beetles break down the remains of dead animals. Some mushrooms breakdown the remains of dead trees. How do these actions most benefit plants? *
Answer:
A By returning nutrients to the soil
Explanation:
Here are the options
A By returning nutrients to the soil
B By releasing oxygen into the air
C By making space for new animals
D By decreasing the population of herbivores
The process by which mushrooms act on dead trees provide nutrients that are necessary for the process of photosynthesis.
Types of decomposers
Fungi - mushroom is an example of a fungiBacteria Insects - beetle is an example of an insectEarthwormsFunctions of a decomposer
A decomposer recycles dead plants and animals to release nutrients into the soil.They are ecological cleaners. they carry out this function by disintegrating dead plants and animal remains.A gold bar 20.0kg at 35.0°c is placed in a large insulated 0.8kg glass container at 15°c and 2.0kg of water at 25°c.. calculate the final equilibrium temperature?
Answer:
The final equilibrium temperature is approximately 26.69 °C
Explanation:
The heat transferred, ΔQ, from a hot body to a cold one is given by the following formula;
ΔQ = m·c·ΔT
Where;
m = The mass of the body
c = The specific heat capacity of the body
ΔT = The temperature change of the body
The given mass of the gold bar, m₁ = 20.0 kg
The initial temperature of the gold bar, T₁ = 35.0 °C
The specific heat capacity of gold, c₁ = 0.13 kJ/(kg·K)
The mass of the glass container, m₂ = 0.8 kg
The initial temperature of the glass container, T₂ = 15°C
The specific heat capacity of glass, c₂ = 0.792 kJ/(kg·K)
The mass of the added water, m₃ = 2.0 kg
The initial temperature of the added water, T₃ = 25°C
The specific heat capacity of water, c₃ = 4.2 kJ/(kg·K)
The heat lost by the gold = The heat gained by the glass and the water
Let 'T' represent the temperature at the final equilibrium, we have;
m₁·c₁·ΔT₁ = m₂·c₂·ΔT₂ + m₃·c₃·ΔT₃
Where;
ΔT₁ = T₁ - T
ΔT₂ = T - T₂
ΔT₃ = T - T₃
∴ 20.0 × 0.13 × (35 - T) = 0.8 × 0.792 × (T - 15) + 2.0 × 4.2 × (T - 25)
Expanding and collecting like terms (using a graphing calculator) gives;
91 - 2.6·T = 9.0336·T - 219.504
9.0336·T + 2.6·T = 219.504 + 91 = 310.504
11.6336·T = 310.504
T = 310.504/11.6336 ≈ 26.69
The final equilibrium temperature, T ≈ 26.69 °C.
Ball A has a mass of 50 kg. Ball B has a mass of 75 kg. Both move at the same velocity. Which has a greater momentum?
Answer:
Ball B
Explanation:
I say this because its the heavier one?
The momentum of a body increases with increase in mass. Hence, among the two balls, the ball with the greater mass that is ball B has the greater momentum.
What is momentum ?Momentum is the ability of a moving object to bring the force effective to make maximum displacement. It is the product of mass and velocity.
P = mv
Thus, as the velocity and mass increases, the momentum increases. The force applied on a body with greater mass makes greater acceleration and greater momentum.
Therefore, at constant velocity, the object with the greater mass will have the greater momentum. Then, the ball with 75 kg mass is having the greater momentum.
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What is the momentum of a bird with a mass of 0.018kg flying at 15m/s?
Answer:
0.27 kg-m/s
Explanation:
i believe this is the correct answer
A wave's speed changes when it goes through a different medium, or type of matter. Our atmosphere is one type of medium, and is crucial to helping sunlight sustain life on Earth. Explain how the atmosphere does this, and what life on Earth might be like if we didn't have an atmosphere.
Which type of electromagnetic wave has the lowest frequency?
A. Infrared light
B. Visible light
C. X-rays
D. Gamma rays
The type of electromagnetic wave that has the lowest frequency is infrared light (option A).
What is an electromagnetic wave?Electromagnetic spectrum is the entire range of wavelengths of all known electromagnetic radiations.
The electromagnetic spectrum extends from the following waves:
gamma raysX-raysvisible lightinfraredradio waves.The frequency of each electromagnetic wave is as follows:
Gamma ray: 10²⁰ – 10²⁴X-rays: 10¹⁷– 10²⁰Visible light: 10¹⁵– 10¹⁷Infrared: 10¹³ – 10¹⁴radio waves: < 3 x 10¹¹Therefore, infrared light has the lowest frequency of the options.
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Answer: Infrared light
Explanation: I took the test
Two charged objects have a repulsive force of .080 N. If the charge of both of the objects is doubled, then what is the new force?
heyy have a nice day yixxixigx
after a hot sun day, a plant withers and dries up. which explains how this happens
Answer:
On a hot, dry day (or after several days with no rain or watering), transpiration causes more water to be lost than is coming in, and the water balance within the plant can get thrown off. The dehydrated collapsing cells in the leaves and stems can no longer remain erect, and the plant begins to wilt.
Explanation:
Complete the following sentence.
The Richter scale is used to compare the
_____ of earthquakes.
Answer:
magnitude
Explanation:
The Richter scale compares the magnitude or energy of earthquakes
If you mix hot water and cold water in an isolated medium, what would be the temperature of the mixture after a certain duration?
The mixture would have the temperature equal to the temperature of the hot water.
The mixture would have the temperature equal to the temperature of the cold water.
The temperature of the mixture would become zero.
The mixture would have the temperature between the initial temperatures of the hot water and the cold water.
Answer: D.
Explanation:
I just took a quiz im in highschool too and I got a 100
If you mix hot water and cold water in an isolated medium the mixture would have the temperature intermediate of the initial temperatures of the hot water and the cold water because of heat transfer.
How heat is transferred ?
Heat moves from higher temperature to lower temperature, a mixture of hot and cold water reaches an intermediate temperature. When hot water is placed over cold water, the denser cold water flows to the bottom, mixes with the hot water, and heats up.Energy is transferred from the hotter, or higher temperature, object to the colder, or lower temperature, object when two objects with different temperatures come into contact, until both are the same temperature. Once the temperatures are the same, there is no net heat transfer because the heat that is transferred from one object to another is the same as the heat that is returned.Changes in temperature are one of the main effects of heat transfer. The temperature rises when heated, while it falls when cooled. The change in a substance's temperature, the substance's mass, and certain phase-related physical properties are the three factors that, according to experiments, determine how much heat is transferred to or from a substance.Heat transfer takes place whenever there is a difference in temperature. Heat move might happen quickly, for example, through a cooking container, or gradually, like through the walls of a protected cooler.There are three distinct approaches to heat transfer: radiation, conduction, and convection. All three may occasionally occur simultaneously.To know more about heat transfer check this:
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Ill give brainliest! 1. Which item below describes a quick change to
Earth's landscape?
A. a stone becoming smooth
B. dirt moving down a steep hill
C. flat land becoming a canyon
D. a glacier flattening the land below it
Answer:
I believe it's D. a glacier flattening the land below it.
30POINTS!!!!The solar wind is made up of electrically charged particles. They do not cause harm on Earth. They are too weak.
True
or
False
Answer:
true
Explanation:
the explanation is we would have been roasted if they weren't to weak
What percentage of high school students did not meet the recommended level of physical activity in one study?
A.
25%
B.
45%
C.
65%
D.
85%
Answer:
c
Explanation:
what poping
A lens with f = 35.0 cm is held
42.0 cm from an object. Where
does the image form?
Answer: 210 cm
Explanation:
Look up Thin Lens Equations Calculator- it helps!
Evidence for the Big Bang theory includes the following? Choose to answers.
A. Far away stars show a red shift
B. Microwave background creation is found all over the observational universe
C. In Fraired background radiation is found all over the observable universe
D. Far away stars show a blueshift
Answer:
A. Far away stars show a red shift and B. Microwave background creation is found all over the observational universe
Explanation:
Red shift in color indicates that galaxies are moving away from Earth. This is proof that the Universe is continously expanding, which also supports the big bang theory.
The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background".
I hope this helps :)
In the Sun, fusion reactions create helium nuclei. To form each helium nucleus, four hydrogen nuclei fuse. The four hydrogen nuclei have a greater total mass than the newly formed helium nucleus. Which statement explains this difference in mass?
Answer:
the mass deficit is directly proportional to bond reeling
Explanation:
The effect of the mass deficit in the nuclei is
δ = m_nucleons - m_nucleo
the delta quantity is the binding energy of the atomic nucleus,
This mass is related to energy by the Einstein relation
ΔE = c² Δm
therefore the mass deficit is directly proportional to bond reeling
Answer:
C. Some of the mass of the four hydrogen nuclei was converted into
energy
Explanation:
Ap3x
HELP I WILL MARK AS BRAINLIEST!
Answer:
it is c
Explanation:
Question :
⇒Define Force
In physics, a force is any interaction that, when unopposed, will change the motion of an object.
[tex] \\ [/tex]
What are the first three harmonics of a note produced on a 0.31 m long violin string if the waves on this string have a speed of 274.4 M/s
Answer:
442 Hz, 882 Hz, 1330 Hz
Explanation:
Given data: length of the string= 0.31 m = 31 cm
speed of the waves = 274.4 M/s or 2740 cm/s
Wavelengths are
62 cm
31 cm and
62 / 3 = 20.67 cm
The frequencies associated with these wavelengths ( which are the 1st, 2nd and 3rd harmonics )
are
27440/ 62 = 442.6 = 442 Hz
27440/31 = 885.2 = 882 Hz
27440 / 20.67 = 1328 = 1330 Hz
En un tiempo de 60 s (segundos), una masa de 0,0014 kg, cambia su velocidad de 25 m/s a 60 m/s. Determine qué fuerza actúa sobre el mismo.
Answer:
Fuerza = 0.0082 Newton
Explanation:
Dados los siguientes datos;
Velocidad inicial, u = 25 m/s
Velocidad final, v = 60 m/s
Tiempo, t = 60 segundos
Masa = 0,0014 kg
Para encontrar la fuerza que actúa sobre el objeto;
En primer lugar, determinaríamos la aceleración del objeto.
Aceleración = (v - u)/t
Aceleración = (60 - 25)/60
Aceleración = 35/60
Aceleración = 5.83 m/s²
A continuación, encontramos la fuerza;
Fuerza = masa * aceleración
Fuerza = 0.0014 * 5.83
Fuerza = 0.0082 Newton
8. An effort force of 15 Newtons is applied to an ideal pulley system to lift up a 16 Newton object. If the effort force is exerted through a distance of 6 meters, calculate the distance that the object is raised above its initial position.
Answer:
the distance that the object is raised above its initial position is 5.625 m.
Explanation:
Given;
applied effort, E = 15 N
load lifted by the ideal pulley system, L = 16 N
distance moved by the effort, d₁ = 6 m
let the distance moved by the object = d₂
For an ideal machine, the mechanical advantage is equal to the velocity ratio of the machine.
M.A = V.R
[tex]M.A = \frac{Load}{Effort} = \frac{L}{E} \\\\V.R = \frac{disatnce \ moved \ by \ the \ effort}{disatnce \ moved \ by \ the \ load} = \frac{d_1}{d_2} \\\\For \ ideal \ machine; \ M.A = V.R\\\\\frac{L}{E} = \frac{d_1}{d_2} \\\\d_2 = \frac{E \times d_1}{L} \\\\d_2 = \frac{15 \times 6}{16} \\\\d_2 = 5.625 \ m[/tex]
Therefore, the distance that the object is raised above its initial position is 5.625 m.
True or False?
waves transfer the material from one location to another
Answer: False
Explanation:
Which of the following best describes the relationship between frequency and wavelength of electromagnetic waves?
a
b
If the frequency remains constant, the wavelength increases.
The wavelength decreases as the frequency decreases.
The frequency increases as the wavelength decreases.
If the wavelength remains constant, the frequency increases.
С
d
Answer:
The option that best describes the relationship between frequency and wavelength of electromagnetic waves is the third option
c. The frequency increases as the wavelength decreases
Explanation:
The frequency of an electromagnetic wave, 'f', is given by the following formula;
[tex]Frequency, \, f = \dfrac{Wave \ Speed,v }{Wavelength, \ \lambda}[/tex]
From the above formula, the frequency of an electromagnetic wave is inversely proportional to the wavelength, and therefore, a higher frequency, ('f', to increase), requires a lower wavelength, (λ, decreases)
The correct option is that the frequency of an electromagnetic increases as the wavelength of the wave decrease.
what is the total equivalent resistance of the circuit?
R1= 5Ω, R2= 3Ω, R3= 4Ω, R4= 1Ω, R5= 2Ω
9. Si en una probeta colocamos 25 ml de aceite, 50 ml de agua y 20 g de
mercurio y mezclamos las sustancias. ¿Qué sustancia queda en la
superficie?
¿Cuál en la Interfase?
y ¿Cuál en el fondo de la
probeta?
DEL ESTADO DE
BAJA CALIFORNIA
Answer:
the order of liquids from bottom to top is Mercury - Water - Oil
Explanation:
In general, when several substances are mixed we can have two cases, that the substances dissolve some enter and that the substances have not been miscible (insoluble) this is our case, the three substances do not dissolve.
Therefore they must be deposited according to the principle of Archimedes,
B -W = 0
if the thrust (B) of the liquid is greater than the weight of the upper body, the body floats and if less, the body sinks.
B = ρ_{liquid1} g V_{liquid2}
W = m_{liquid2} g
substance densities are tabulated
ρ_{oil} = 750 to 950 kg / m3
ρ_ water = 1.00 10³ kg / m³
ρ_ Hg = 13.6 10³ kg / m #
The thrust created by the mercury is
B_Hg = ρ_Hg g V_ Liquid2
B_Hg = 13.6 10³ 9.8 V
B _Hg = 133.3 10³ V
The push of the water
B_water = 1 10³ 9.8 V
B_water = 9.8 10³ V
The oil density, let us use ρ_oil = 0.75 10³ kg / m³
B_ oil = 0.750 10³ 9.8 V
B _ oil = 7.35 10³ V
let's find the volumes of the bodies
Mercury
ρ = m / V
V_hg = m /ρ_Hg
V_Hg = 20 10⁻³/ 13.6 10³
V_Hg = 1.47 10⁻⁶ m³
Water
V_water = 50 10⁻³ L
we reduce from liter to m³ 1000 l = 1 m³
V_water = 50 10⁻⁶ m³
Oil
V_oil = 25 10⁻³ l
V_oil = 25 10⁻⁶ m³
Let's look for the push for every two substances
The mercury in the bottom and upper sustabce the water and oil
B_hg = 133.3 10³ (V_water + V_oil)
B = Hg = 133.3 10³ (50 + 25) 10⁻⁶
B = 10 N
the weight of substance on mercury is
W = W_water + W_oil
W = ρ_water g V_water + ρ_oil g V_oil
W = g (ρ_water V_water + ρ_oil V_oil)
W = 9.8 (1 10³ 50 10⁻⁶ + 0.75 10³ 25 10⁻⁶)
W = 9.8 68.75 10⁻³
W = 6.7 10⁻¹ N
We can be that the weight of this substance in less than the push created by the mercury therefore they float.
In resume the mercury is the substance that will be at the bottom of the cylinder.
Let's repeat the calculation for water and oil.
Suppose the water is below
B₂ = ρ_water g V_oil
B₂ = 1 10³ 9.8 25 10⁻⁶
B₂ = 245 10⁻³ N
B₂ = 2.5 10⁻¹ N
The weight of the oil
W = ρ_oil g V_oil
W = 0.750 10³ 9.8 25 10⁻⁶
W = 183.75 10⁻³
W = 1.8 10⁻¹ N
we see that the thrust of the water is greater than the weight of the oil therefore the oil floats in the water
In summary the order of liquids from bottom to top is
Mercury - Water - Oil
PLZZZ HELP ME ASAP!!! :(
Materials that hold electrons very tightly, and thus don't allow much static electricity to occur around them, are called
Hamid is going to heat sodium chloride and water in a beaker. How can he carry out his experiment as
safely as possible?
[4 marks]
Answer:
he can wear gogles lab coat and gloves
Explanation:
