What kind of atmosphere surrounds mercury?
none
carbon dioxide
methane
dense clouds
Answer:
None
Explanation:
Mercury does not have a atmosphere because it is simply to hot. Because of its temperature it's atmosphere is constantly being replenished as the atoms escape into space.
Which two elements undergo fusion in the sun?
Answer:
In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.
Three 20.0 ohm resistors are
connected in parallel and attached to
a 5.00 V battery. How much current
flows out of the battery?
Answer:
0. 75A
Explanation:
R1=20omh
R2=20omh
R3=20omh
equivalent voltage (V)= 5.00V
equivalent resistance (R) = ?
equivalent current (I)= ?
since, they are in parallel so,
1/R = 1/R1 + 1/R2 + 1/R3
1/R = 1/20 + 1/20 + 1/20
1/R = 3/20
R = 6.67 ohm
Now,
from ohm's law
V= IR
or, 5 = 6.67*I
or, I = 0.749
hence, I= 0.75A
When two objects made of different materials are rubbed together, they will attract each other after the charging process.Immersive Reader (1 Point) True False
Answer:
True
Explanation:
because their is friction(e.g take a ruler rub it in your hair then put it on top of a piece of paper on the table then u will see the process)among the two objects.
A wave is sent down a tunnel where it travels and bounces of the far wall, returning to the sender. The wave travels at 4m/s and it takes 120 seconds to travel there and back. How deep is the cave?
Answer:
100ft
Explanation:
how do you get this equation?
please help
Answer:
It's a kinematic equation.
Explanation:
x displacement = (velocity_final * time) - (0.5 * acceleration * time * time)
You should be given a value, context(word problem), or diagram.
If you're deriving for a term just isolate the term.
If you're asking why the -(0.5 * acceleration * time * time) is negative instead of positive, would need context.
A 9-volt battery is connected to a 4-ohm resistor and a 5-ohm resistor as shown in the diagram above. How much current flows through the 4-ohm resistor?
1.0 A
1.8 B
2.3 C
4.0 D
The current flowing in the 4 ohms resistor connected in series with 5-ohm resistor is determined as 1.0 A.
Equivalent resistance of the circuit
The equivalent resistance of the circuit is determine as follows;
Rt = R1 + R2
Rt = 4 ohms + 5 ohms = 9 ohms
Current flowing in the 4 ohms resistorThe current flowing in the 4 ohms resistor is determined from Ohms law as shown below;
V = IR
I = V/R
I = 9/9
I = 1.0 A
Since the circuit is in series arrangement, same current will flow in 5 ohm and 4 -ohm.
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A mover pushes a 20 kg crate across a level floor with a force of 200 n, but
a the crate accelerates at a rate of only 7.5 m/ s2 because a friction force
opposes the crate's motion. what is the magnitude of this force of friction?
200 n
force of friction
a. 50 n
b. 15 n
c. 25 n
d. 100 n
The magnitude of the force of friction between the crate and floor is 50 N.
Magnitude of the force of friction
The magnitude of the force of friction is determined from Newton's second law of motion.
F - Ff = ma
Ff = F - ma
Ff = 200 - (20 x 7.5)
Ff = 50 N
Thus, the magnitude of the force of friction between the crate and floor is 50 N.
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Which form of precipitation is most likely to occur when the temperature in the clouds is below freezing, but the temperature in the air below is above freezing?
Hail
Rain
Sleet
Snow
Answer:
Hail :) hope this helps
Explanation:
A glass prism can be used to show the dispersion of white light to form a spectrum.
a.Draw a diagram to show how a ray of white light is dispersed as it passes through a prism.
b.Which colour of light is most strongly dispersed (deflected) as it passes through the prism?
c.Explain why some colours of light are more strongly dispersed than others.
For each of the following statements, decide whether it is true or false.
a) For Diagram refer to the attachment.
b) The colour that dispersed most is violet.
c) Every colour has its own wavelengths/ frequency. Different colours move with same speed in air / vaccum. But their speeds in refracting media like glass are different. Therefore, refractive index of the medium for different colours is different. Some gets strongly dispersed due to shorter wavelengths.
Explanation :
Dispersion of Light : The splitting up of a white light into different colours is called Dispersion of light. The light is made up of different colours. Each colour travels at its own speed inside a prism. Due to this different colours of light bend through different angles with respect to the incident ray , as they pass through a prism. The eed light bends the least while the violet the most. Thus, the rays of each colour emerge along different paths and thus becomes distinct.Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer: Through Photosynthesis
Explanation:
Answer:
Option 3
Explanation:
Carbon is cycled into the hydrosphere through the diffusion from the atmosphere.
Further explaining this :
Some of the carbon dioxide molecules in the rain react with the water droplets to form carbonic acid that falls with the rain. The carbonic acid that falls to the surface of the Earth dissolves rocks by the process of chemical weathering, where it releases calcium, magnesium, potassium or sodium ions. These ions are carried by rivers to the ocean. The carbonic acid that falls directly into surface water bodies reacts with the water to form bicarbonate ions.
A student made the claim that a 4 gram paintball fired from a paintball gun at 90 m/s could have about the same kinetic energy as a 1 gram BB pellet fired from a BB gun at 180 m/s.
Do you agree or disagree with the student's claim? Use evidence and mathematical reasoning to support your response.
This question involves the concept of kinetic energy.
The student's claim is "right".
Kinetic EnergyThe energy possessed by a body, by the virtue of its motion is called kinetic energy. Mathematically it is given by the following formula:
[tex]K.E =\frac{1}{2}mv^2[/tex]
where,
K.E = Kinetic energy m = massv = velocityTherefore,
For the paintball:
[tex]K.E = \frac{1}{2}(4\ g)(90\ m/s)^2[/tex]
K.E = 16200 J
For the pellet:
[tex]K.E = \frac{1}{2}(1\ g)(180\ m/s)^2[/tex]
K.E = 16200 J
Hence, both paintball and pellet will have same kinetic energy. The student is right.
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A taser sends about 1100 V through the human body, resulting in an average current of 2.5 mA. a) Determine the Power output of the taser. b) How much charge (C) flows per second? c) How many electrons flow through the body per second when the taser is deployed through someone's body?
This question involves the concepts of current, power, and charge.
a) The power of taser is "2.75 watt".
b) The magnitude of charge flow per second "2.5 x 10⁻³ C/s".
c) Electrons flow per second is "1.56 x 10¹⁶ electrons/s".
a) PowerThe power of the taser can be given by the following formula:
P = IV
where,
P = Power = ?I = current = 2.5 mA = 2.5 x 10⁻³ AV = potential difference = 1100 VTherefore,
P = (2.5 x 10⁻³ A)(1100 V)
P = 2.75 Watt
b) Charge Flow per Second
The charge flow per second is equal to the current passing through taser.
[tex]\frac{q}{t}=I[/tex]
where,
[tex]\frac{q}{t}[/tex] = charge flow per second = ?I = current = 2.5 mA = 2.5 x 10⁻³ ATherefore,
[tex]\frac{q}{t}=2.5\ x\ 10^{-3}\ C/s[/tex]
c) Electron Flow per SecondThe electron flow per second is given by the following formula:
[tex]I = \frac{q}{t} = \frac{ne}{t}\\\\\frac{n}{t}=\frac{q}{te}[/tex]
where,
[tex]\frac{n}{t}[/tex] = electrons flow per second = ?e = charge on one electron = 1.6 x 10⁻¹⁹ CTherefore,
[tex]\frac{n}{t}=\frac{2.5\ x\ 10^{-3}\ C/s}{1.6\ x\ 10^{-19}\ C}\\\\\frac{n}{t}=1.56\ x\ 10^{16}\ electrons/s[/tex]
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Select the correct answer. kristina works out seven days a week. lately, she has been tired, and her body aches. if she is overtraining, which training principle should kristina consider before continuing her program? a. overload b. recovery c. transfer d. variation
Answer:
Select the correct answer. kristina works out seven days a week. lately, she has been tired, and her body aches. if she is overtraining, which training principle should kristina consider before continuing her program? a. overload b. recovery c. transfer d. variation
b recovery
The half-life of gold-198 is 2.7 days. After 5.4 days, how much of the original gold-198 remains?
A. one-half B. one-quarter C. all D. none
The the amount of the original gold-198 that remains after 5.4 days is one-quarter.
What is half-life?Half-life is the time required or taken for half the amount of matter present in a given substance to vanish or decay.
The half-life of gold-198 is 2.7 days.
After, 5.4 days, the gold would have undergone two half-lives.
The amount of matter remaining = 1/2 * 1/2 = 1/4
Therefore, the amount of the original gold-198 that remains is one-quarter.
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3. Assume that a sample decays with a given half-life. Will you be able to observe when the sample has completely decayed? Why or why not?
Answer:
No
Explanation:
It will never decay to zero
after one half life there is 1/2 left
after the next half life thee is 1/2 * 1/2 = 1/4 left
then 1/8th then 1/16 th then 1/32 1/64 1/128 ........to infinity
while htere is a VERY small amount left , there will never be ZERO left
. A 6 ohm resistor is connected to a 15 volt battery.
a. What is the current in the circuit?
b. How much heat is produced in 10 minutes?
Answer:
2.5A , 22500 JOULE
Explanation:
Resistance (R)= 6 ohm
Voltage (V) = 15 volt
a)
Current (I) = ?
From ohm's law,
V=IR
15 = 6*I
I = 2.5 A
b)
time(t) = 10min = 600 second
heat energy (Q) = ?
from Joule's law of heating,
Q = I²*R*t
Q = 2.5² *6*600
Q = 22500 Joule
hence, heat energy produced is 22500 joule.
A nearsighted eye has a far point of 100 cm. Objects further than 100 cm are not seen clearly. A diverging lens is used to permit clear vision of an object placed at infinity. Find the focal length of the lens.
A diverging lens is used to permit clear vision of an object placed at infinity. The focal length of the lens is -100 cm.
What is focal length?The focal length is half of the radius of curvature of the focal lens.
By the lens maker formula,
1/f = 1/v +1/u
where, v is the image distance and u is the object distance.
Give, the object is at infinity and the image must form at 100 cm, the the focal length will be
1/f = 1/ -100 + 1/∞
f = -100 cm
The focal length must be -100 cm for the diverging lens.
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if nominal gdp is 1800 and the money supply is 450, then what is velocity?
Answer:
Explanation:
answer: 4 velocity.
if nominal gdp is 1800 and the money supply is 450, then what is velocity?
4 velocity.
If the nominal GDP is 1800 and the money supply is 450, then the velocity of money would be 4.
The total value of goods and services generated in an economy during a given time period, usually a year, is referred to as nominal GDP and is not adjusted for inflation. It depicts what products and services are now selling on the market.
Given:
Nominal GDP, PQ = 1800
Money supply, M = 450
From equation of exchange:
MV = PQ
V = (PQ) ÷ M
V = (1800) ÷ (450)
V = 4
Hence, if the nominal GDP is 1800 and the money supply is 450, then the velocity of money would be 4.
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I need some help with this question
the answer for number 2 is B
An electromagnetic am-band radio wave could have a wavelength of.
An electromagnetic AM-band radio wave could have a wavelength of 186.6 meters.
Wavelength is the distance between two consecutive points on a wave that are in phase, meaning they are at the same position in their respective cycles. It is usually denoted by the Greek letter lambda (λ) and is measured in units of length, such as meters, centimeters, or nanometers.
The relationship between wavelength, frequency, and speed of a wave is given by the formula:
wavelength = speed / frequency
where "speed" refers to the speed of the wave through a medium, and "frequency" refers to the number of cycles per second.
The AM radio band frequency ranges from 535 kHz to 1605 kHz. To find the wavelength of the AM radio wave, we can use the formula:
wavelength = speed of light / frequency
where the speed of light is approximately 299,792,458 meters per second.
Let's take the highest frequency in the AM radio band, which is 1605 kHz. We need to convert this frequency to Hertz (Hz) by multiplying it by 1000 since kHz is 10^3 times larger than Hz.
1605 kHz = 1605 x 1000 Hz = 1,605,000 Hz
Now, we can calculate the wavelength of the AM radio wave using the formula:
wavelength = 299,792,458 / 1,605,000
wavelength ≈ 186.6 meters
Therefore, an electromagnetic AM-band radio wave could have a wavelength of approximately 186.6 meters.
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The masses of two objects are 2 kg and 8 kg, respectively.If their kinetic energies are in 2:1 proportion, the ratio of their speeds is ___.
√2 :1
1:2
2√2 :1
Let's see
[tex]\\ \rm\Rrightarrow \dfrac{KE_1}{KE_2}=\dfrac{2}{1}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{0.5(2)v_1^2}{0.5(8v_2^2)}=\dfrac{2}{1}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{v_1^2}{4v_2^2}=\dfrac{2}{1}[/tex]
[tex]\\ \rm\Rrightarrow v_1^2=8v_2^2[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{v_1^2}{v_2^2}=\dfrac{8}{1}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{v_1}{v_2}=\dfrac{2\sqrt{2}}{1}[/tex]
[tex]\\ \rm\Rrightarrow v_1:v_2=2\sqrt{2}:1[/tex]
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We observe the wheels of buses and trucks are heavier than the wheels of cars and scooters why.
Answer:
they carry a heavier load
Explanation:
Answer:
The wheels of buses and trucks are heavier than the wheels of car or scooters because the buses and trucks are heavy and require to exert less pressure. We know that when pressure decreases an area of contact increases, so the tires are broadened so that they exert less pressure on the road and move easily.
Explanation:
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The amount of electric energy consumed by a 60 watt lightbulb for 1 minute could lift a 10 newton object to a maximum vertical height of
Answer: physics are fake
Explanation:
Study the image.
The image shows the electric field lines between two charged plates.
Which statement would be true for these plates?
Select one:
A. The right plate is neutral.
B. The right plate is positively charged.
C. The left plate is positively charged.
D. The left plate is neutral.
Abdul, while driving to school, computes the average speed for his trip to be 20 km.h–1. On his return trip along the same route, there is less traffic and the average speed is 30 km.h–1. What is the average speed for Abdul’s trip?
a force of 50 N directed 30 degrees above the horizontal is applied to a 10 kg block at rest on a rough horizontal surface. what is the coefficient of kinetic friction between the block and the horizontalsurface if the acceleration of the block is 20 m/s^2
The coefficient of kinetic friction between the block and the horizontal surface will be 1.597.
What is kinetic friction?A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion.
The given data in the problem is;
μ is the coefficient of kinetic friction=?
m is the mass of the block=10 kg
g is the acceleration due to gravity= 9.81 m/s²
Acceleration of block(a)=20 m/s²
Force (F)= 50 N
θ=30°
There are two forces to act on the block, one is the force directed while the other was the friction force opposing the motion.
From the newton's second law;
F= ma
F-f = ma
Fcos30°- μmg=ma
50cos 30°-μ× 10×9.81 =10 × 20
μ= 1.597
Hence, the coefficient of kinetic friction will be 1.597.
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As you travel up into the mountains of the troposphere, increasing elevation,
the air pressure...
Oa. Decreases because the air gets more dense
O b. Decreases because the air gets less dense
Oc. Increases because the air gets more dense
Od. Increases because the air gets less dense
Answer:
OA
Explanation:
how much work is done on a small car if a 3000 N force is exerted to move it 75 m to the side of the road ?
Answer:
Soln,
force=3000 N
distance=75 m
we know that,
work done= force × distance
= 3000× 75
= 225000 joule
A temperature inversion prevents the ____ currents that would carry pollutants up into the atmosphere
Answer:
convection
Explanation: