Answer:
negative
Explanation:
What causes convection currents?
1. The Earth's rotation
2. The uneven heating of Earth's surface
3. The jet stream
4. The uneven cooling of Earth's surface
Answer:
not sure if this answer helps,
Explanation:
What is caused by the uneven heating of Earth and its atmosphere?
Global winds
This uneven heating produces global circulation patterns. For example, the abundance of energy reaching the equator produces hot humid air that rises high into the atmosphere. ... The air eventually stops rising and spreads north and south towards the Earth's poles.Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler water surfaces.
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The diagram models a sound wave traveling through a liquid.
Which diagram models how the sound wave will change when it enters a gas?
Answer:
The correct option is;
A.
Explanation:
The speed of sound varies with the medium within which the sound propagates. Therefore, the wavelength of the sound wave changes as it moves from one medium to another
The speed of sound in liquid which is given by the square root of the ratio of the bulk modulus (compression resistance) to the density of the liquid is generally faster than in gas, therefore, given that the frequency of the sound source in constant, the wavelength, λ, given as λ = v/f, which is therefore, directly proportional to the speed of sound, also reduces, which is represented by a reduced distance between successive crest as seen in figure A.
Add the following vectors together:
35 km at 25 degrees N of E
15 km at 10 degrees E of N
Answer:
The resultant vector is 45.3 N 40.74° North of East
Explanation:
The given vectors can be presented as follows;
35 km at 25 degrees N of E = 35 × cos(25)·[tex]\mathbf{\hat i}[/tex] + 35 × sin(25)·[tex]\mathbf{\hat j}[/tex]
15 km at 10 degrees E of N = 15 × cos(90 - 10)·[tex]\mathbf{\hat i}[/tex] + 15 × sin(90 - 10)·[tex]\mathbf{\hat j}[/tex]
15 km at 10 degrees E of N = 15 × cos(80)·[tex]\mathbf{\hat i}[/tex] + 15 × sin(80)·[tex]\mathbf{\hat j}[/tex]
The sum of the vectors becomes;
∑d = 35 × cos(25)·[tex]\mathbf{\hat i}[/tex] + 15 × cos(80)·[tex]\mathbf{\hat i}[/tex] + 35 × sin(25)·[tex]\mathbf{\hat j}[/tex] + 15 × sin(80)·[tex]\mathbf{\hat j}[/tex]
∑d ≈ 34.33·[tex]\mathbf{\hat i}[/tex] + 29.56·[tex]\mathbf{\hat j}[/tex]
The magnitude of the resultant vector = √(34.33² + 29.56²) ≈ 45.3 N
The direction = tan⁻¹(29.56/34.33) ≈ 40.74° North of East
The resultant vector = 45.3 N 40.74° North of East
what is the specific heat of an unknown substance if a 2.50 g sample releases 12 calories as its specific heat capacity is 0.96 J/gC. What is the temperature change?
Answer:
1) The specific heat is the heat required to be added to a unit mass of the substance to cause a unit rise in its temperature
2) The temperature change is 20.92°C
Explanation:
The given parameters are;
The mass of the substance, m = 2.50 g
The heat released by the sample, ΔQ = 12 calories = 50.208 J
The specific heat capacity of the substance, c = 0.96 J/(g·°C)
Therefore, we have;
Heat released, ΔQ = Mass, m × Specific heat capacity, c × Temperature change, ΔT
Substituting in the known values gives
50.208 J = 2.50 g × 0.96 J/(g·°C) × ΔT
ΔT = 50.208 J/(2.5 g× 0.96 J/(g·°C)) = 20.92°C
The temperature change = 20.92°C
Two workers are sliding 270 kg k g crate across the floor. One worker pushes forward on the crate with a force of 430 N N while the other pulls in the same direction with a force of 230 N N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a constant speed. What is the crate's coefficient of kinetic friction on the floor?
Answer:
The value is [tex]\mu_ k = 0.249[/tex]
Explanation:
From the question we are told that
The mass of the crate is [tex]m = 270 \ kg[/tex]
The force applied by the first worker is [tex]F_1 = 430 \ N[/tex]
The force applied by the second worker is [tex]F_2 = 230 \ N[/tex]
Generally the kinetic frictional force between the crate and the floor is equal to the force applied by both worker , this is mathematically represented as
[tex]F_f = F_1 + F_2[/tex]
Here [tex]F_f[/tex] is the frictional force and this is mathematically represented as
[tex]F_f = \mu_ k * m * g[/tex]
So
[tex]\mu_ k * m * g = F_1 + F_2[/tex]
=> [tex]\mu_ k * 270 * 9.8 = 430 + 230[/tex]
=> [tex]\mu_ k = 0.249[/tex]
For the winter, a duck flies at 15 m/s due south against a gust of wind due north. If the wind is blowing at 5 m/s, calculate the resultant velocity of the duck.
Answer:
Explanation:
The north direction is towards the positive y direction on the coordinates axis and the south is towards the negative direction of the coordinate axis.
If a duck flies at 15 m/s due south against a gust of wind, then the duck velocity will be -15m/s
If the wind is blowing at 5 m/s due north, the velocity of the wind will be +5m/s
The resultant velocity of the duck will be the sum of the velocity along the y - component = -15 + 5 = -10m/s
Hence the resultant velocity of the dock is -10m/s
1. A lab cart travels at 0.5 m/s for 3.7 m. How long did it take the cart to travel this distance? show steps
Answer:
Time, t = 7.4 secs.
Explanation:
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex] ....equation 1
[tex]Time = \frac{distance}{speed}[/tex] .....equation 2
Given the following data;
Speed = 0.5m/s
Distance = 3.7m
Substituting into equation 2;
[tex]Time = \frac{3.7}{0.5}[/tex]
Time, t = 7.4 secs.
What is the momentum of a 7.0 kg bowling ball rolling at 2.4 m/s? Express your answer to two significant figures and include the appropriate units
Answer:
16.8 kg m/s is the momentum of a bowling ball
Explanation:
Given:
m = 7kg
v = 2.4 m/s
Unknown:
p or momentum
Formula and Solution:
p = mv
p = 7kg × 2.4m/s
Final Answer:
p = 16.8 kg m/s is the momentum of a bowling ball
How to find momentum?
Momentum, product of the mass of a particle and its velocity. Momentum is a vector quantity. It has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. See Newton's laws of motion. Momentum.
Formula = p = mv or momentum = mass x velocity
the process of changing soild to liquid stat is called
A.melting
B.boiling
C.evaporation
D.freezing
Answer:
When a solid reaches the temperature of its melting point, it can become a liquid. For water, the temperature needs to be a little over zero degrees Celsius (0oC) for you to melt.
Explanation:
Un objeto se encuentra a los 4 segundos de 10 cm del origen, a los 12 segundos, a100 centimetros del origen, si mantuvo un movimiento rectilineo uniforme. ¿cual es su velocidad?
Explicación:
La velocidad es el cambio de distancia con respecto al tiempo.
Velocidad = Δd / Δt
Δd es entonces un cambio de distancia
Δt es el cambio en el tiempo
Δd = d2 - d1
Δd = 100 cm - 10 cm
Δd = 90 cm
Convertir a metros
100 cm = 1 m
90cm = x
x = 90/100
x = 0,9 m
Por lo tanto, 90 cm = 0,9 m
Δt = t2 - t1
Δt = 12 s - 4 s
Δt = 8 s
Sustituye el valor obtenido en la fórmula de velocidad:
Velocidad = 0.9 / 8
Velocidad = 0,1125 m / s
Por lo tanto, su velocidad es de 0,1125 m / s.
A rock thrown up into the air with an initial speed of 25 m/s . How much time will pass before the rock is moving back down at 6 m/s ?
* Describe the motion of an
object in which its speed is
constant but the velocity is
changing.
Answer:
To summarize, an object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of the object is...
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What type of change is melting ice?
A. physical
B. chemical
Answer:
A. physical
Explanation: When you melt an ice cube (H2O), you have a physical change because you add energy. You added enough energy to create a phase change from solid to liquid. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice.
i hope this helped good luck:)
Develop a logical argument as to why television satellites, which broadcast information as electromagnetic radiation, can send signals from the vacuum of space?
The correct answer to this open question is the following.
Although you did not include options for this question, we can say the following.
Trying to be clear and concise, television satellites, which broadcast information as electromagnetic radiation, can send signals from the vacuum of space because electronic radiation can travel throughout space with no medium that transports it. Electronic radiation needs no material channel or medium to travel such as wires or cable.
That is how technology has developed wonders such as satellite communications for telephone, TV, or the internet. Information, data, sound, and images travel through transverse waves that easily move through the vacuum of space.
Electromagnetic radiations are defined as waves that do not require a medium for propagation. The EM waves have electric and magnetic vectors that do not require any medium to propagate.
The arguments can be explained as:
The Television antennae receive the signals in the form of electromagnetic waves.
The waves are transmitted from the satellites present in space. These waves are then transmitted to the TV station, where the information is then broadcasted. Other electronic devices such as cellular phones, computers, and FM radios have been developed using the propagation of the EM waves.
Thus, the EM waves do not require propagation due to which the signals can be easily transmitted from space.
To know more Electromagnetic Waves, refer to the following link:
https://brainly.com/question/8553652
Help I don’t get it
If you help you get brainliest and 50 points
It’s science
Answer: i cant help u with that its a grade above me
Explanation:
• What are some examples of REPresentatives?
answer:
the house of representatives is an example of representatives!
explanation:
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Look at SS and answer
In a ballistics test, a 21 g bullet traveling horizontally at 1200 m/s goes through a 35-cm-thick 300 kg stationary target and emerges with a speed of 950 m/s . The target is free to slide on a smooth horizontal surface.
Complete Question
In a ballistics test, a 21 g bullet traveling horizontally at 1200 m/s goes through a 35-cm-thick 300 kg stationary target and emerges with a speed of 950 m/s . The target is free to slide on a smooth horizontal surface.
a
How long is the bullet in the target? ____ s
b
What average force does the bullet exert on the target? _____ N
c
What is the target's speed just after the bullet emerges? _____ m/s
Answer:
a
[tex]t =3.256*10^{-4} \ s[/tex]
b
[tex]F = 16124 \ N[/tex]
c
[tex]v_1 = 0.0175 \ m/s[/tex]
Explanation:
From the question we are told that
The mass of the bullet is [tex]m = 21 \ g = 0.021 \ kg[/tex]
The horizontal speed is [tex]u =1200 \ m/s[/tex]
The thickness is [tex]s = 35 \ cm = 0.35 \ m[/tex]
The mass of the block is [tex]m_1 = 300 \ kg[/tex]
The emerging speed is [tex]v = 950 \ m/s[/tex]
Generally from kinematic equation
[tex]v^2 = u^2 + 2as[/tex]
So
[tex]a = \frac{v^2 - u^2}{2s}[/tex]
=> [tex]a = \frac{ 950^2 - 1200^2}{2 * 0.35}[/tex]
=> [tex]a = -767857.14 \ m/s^2[/tex]
Gnerally the time taken is mathematically represented as
[tex]t = \frac{ v- u}{a}[/tex]
=> [tex]t = \frac{ 950 - 1200}{-767857.14}[/tex]
=> [tex]t =3.256*10^{-4} \ s[/tex]
Generally from law of momentum conservation we
[tex]m *u + m_1 * u_1 = m * v + m_1 * v_1[/tex]
[tex]u_1[/tex] is the velocity of the block at rest which is [tex]u_1 = 0 \ m/s[/tex]
=> [tex]0.021 *1200 + 300 * 0 = 0.021 * 950 + 300 * v_1[/tex]
=> [tex]v_1 = 0.0175 \ m/s[/tex]
Generally the force is mathematically represented as
[tex]F = \frac{m_1 * v_1 }{t}[/tex]
=> [tex]F = \frac{300 * 0.0175 }{3.256 *10^{-4}}[/tex]
=> [tex]F = 16124 \ N[/tex]
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To observe a chemical property, a chemical change must occur (new substances produced). To see if a piece of paper has the chemical property of combustability (will burn in oxygen), you must actually try to burn it, producing carbon (ash), water vapor, carbon dioxide – the material is no longer paper. What are some clues, observations that might indicate that a chemical change has occurred?
Answer:
Explanation:
Chemical reaction is described as the process of rearrangement of the atoms to produce a new product which will have a different chemical identity.
For the observatory evidences to prove a chemical reaction has occurred we can look to the following:
Emission of heat/loss of heatEmission of lightchange in the physical formFormation of precipitateEvolution of gasescolor changeDecomposition of the organic matterGenerally chemical change is irreversibleAbsolute result for the chemical change can be observed using the chemical analysis
During an electricity investigation, a student stated, "When the voltage increases current increases." Which equation can be used to justify this claim?
Answer:
The equation used to justify the claim is Ohm's law:
I = V/R
where:
V = voltage
I = current
R = Resistance
Explanation:
Ohm's Law describes the relationship between current, voltage and resistance, and is represented by the equation; i = v/r.
The law states that the current flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r. This means that if the current is increased, the voltage will increase, and the resistance will reduce.
The equation that can be used to justify the claim is : I = V/R ( Ohm's Law )
Ohm's law ( I = V/R ), states that the current flowing through an electrical circuit is directly proportional to the voltage flowing through the circuit and inversely proportional to the resistance in the circuit.
In a nutshell an increase in voltage will cause a proportionate increase in the current present in the electrical circuit.
Therefore we can conclude that the equation that can be used to justify the claim is Ohm's law ( I = V/R )
Learn more about Ohm's Law : https://brainly.com/question/14296509
which force is a contact force?
A. a magnet pulling
B. a bicycle breaking
C. Lightning forming
D. Leaves falling
Answer: The answer is B.
Explanation: Trust me, i'm right.
In the "herd" strategy for immunization, vaccinations are given _____. only to individuals who are most likely to be exposed to a disease only to individuals who travel to countries where certain disease are a threat to a large majority of the population the entire population
Answer:
C. to a large majority of the population.
Explanation:
Immunization can be defined as the process of boosting an individual's immunity or immune system against antigens (immunogen) which cause diseases by the administration of vaccines.
Basically, immunization helps to improve the functions of the antibodies, B cells, T cells etc.
In the "herd" strategy for immunization, vaccinations are given to a large majority of the population in order to protect and prevent the spread of an infectious disease to those who are not immune.
Answer:
to a large majority of the population
Explanation:
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Newton throws an apple straight up at 10 m/s. What is the ball's velocity
after 1.4 seconds?
Answer:
23.72m/s
Explanation:
The final velocity can be calculated using the formula:
V = u + at
Where; v = final velocity (m/s)
u = initial velocity (m/s)
a = acceleration due to gravity (m/s²)
t = time (s)
Based on the provided information, u = 10m/s, t = 1.4s, a = 9.8m/s²
V = 10 + (9.8 × 1.4)
V = 10 + 13.72
V = 23.72m/s
If the density of the object is lesser than density of the water, what will happen?
Explanation:
Compare the density of the object in question to the density of water. If its density is less than water, it will float. ... If the density of an object is greater than water, it will sink.
Answer:
The object will float.
Explanation:
If the density is less than of water, then the object will float. Take ice for example. It's density is less than water's density. That's why ice floats at the top of lakes. I hope this helps and I hope it's not wrong, but I don't think it is.
Put the following equipment in order from smallest to largest
Marble Table, Chocolate Tempering Machine, Pastry Bag,
Sifter, Commercial Dough Sheeter, Steam Jacketed Kettle,
Rolling Pin, Parisian Scoop, Chinois, Pocket Thermometer,
Immersion Blender, Robot Coupe
Answer:
Parisian Scoop
Pocket thermometer
Pasty Bag
sifter
chinois
Rolling Pin
Immersion Blender
Chocolate tempering machine
Robot Coupe
Steam Jacketed kettle
marble table
commercial dough sheeter
Explanation:
Really it could differ dependent on model variety of each item
Help Plz ;)
In the diagram below, 4 pairs of metal spheres of equal size sit on a level surface the same distance apart. However, the type of metal each sphere is made from changes the mass of these spheres. Which pair of metal spheres has the greatest gravitational attraction between them?
Answer:
Errrrrrrm I believe it would be (D)
As an object falls freely, its
Answer:
acceleration increases or is uniform
Explanation:
Answer:
Both
Explanation:
4. What is the correct formula for density?
D=m/w
M= V x D
D= m/v
D=m+v
Answer:
M=m/v dhdfhdyvgzrhtcgvygvvy
Answer:
D= m/v
Explanation:
The formula for density is D = M/V, where d is density, M is mass, and V is volume. Density is equal to Mass only when divided by the volume.
An arrow is given an initial velocity from the bow with which it is shot. Assuming that the air resistance is negligible, once the arrow leaves the bow,
A. it requires another force to keep it moving.
B. it accelerates horizontally until it stops moving.
C. it moves with a positive vector to the ground. D. the only force acting on it is the force of gravity.
Answer: it moves with a positive vector yo the ground
Explanation:
