Answer:
Below!
Explanation:
Select the correct answer. What do scientists use to determine the temperature of a star? A. Thermometer B. Distance from Earth C. Composition D. Color.
Answer:
Color
Explanation:
Thus, for stars, considering them as “black bodies”, we can get an approximate figure for their temperature by measuring their dominant frequency (color). Technically scientists measure the brightness of the blue light and that of red light from the star, and from this they can calculate the temperature of the star.
Answer: color answer D
Explanation:
A rock is thrown downward from the top of a cliff with an initial speed of 12 m/s. If the rock hits the ground after 2.0 s, what is the height of the cliff?
The required height of the cliff is 4.4 m.
Given data:
The magnitude of initial speed of rock is, u = 12 m/s.
The time interval of hitting is, t = 2.0 s.
The given problem is clearly resolved using the concept and fundamentals of second kinematic equation of motion. As per the second kinematic equation of motion we have,
[tex]h =ut+\dfrac{1}{2}(-g)t^{2}[/tex]
Here,
h is the height of cliff.
g is the gravitational acceleration.
Solving as,
[tex]h =(12 \times 2)+\dfrac{1}{2}(-9.8) \times2^{2}\\\\h = 4.4\;\rm m[/tex]
Thus, we can conclude that the required height of the cliff is 4.4 m.
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A sound wave is produced when a medium begins to .
A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.
What is a sound wave?When an object vibrates, a pressure wave is created, which produces sound. The particles in the surrounding medium (air, water, or solid) vibrate as a result of the pressure wave.
The vibrations of the particles move nearby particles, allowing the sound to travel further through the medium.
Hence a sound wave is produced when a medium begins to vibrate.
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Answer:
vibrate
Explanation: slaaauyy
Describe the motion of the box:
A)The box will not move because the forces acting on the box are balanced.
B)The box will move 75N to the right, because the forces are unbalanced.
C)The box will move 75N to the left, because the forces are unbalanced.
Answer:
B
Explanation:
because that's the answer
How is the centripetal force related to the tangential velocity of the mass?.
Answer:
The force is proportional to the square of the tangential velocity of the mass. How many different masses are we going to perform this experiment with?
Explanation:
Explain how heat (thermal energy) can change the motion (kinetic energy) of the particles in objects.
Answer:
Adding heat makes the particles move faster so the particles have more kinetic energy when more thermal energy is added
Explanation:
One of two lorries is half the weight of the other, but is moving at twice the speed of the other. Which of the lorries has more kinetic energy?
Need urgently help and please someone offer to help me with this exercise.. Thank you ^-^
Answer:
1 /2 (W / g) V^2 = KE1
1/2 *(W / 2) / g * (2V}^2 = KE2 = 1/2 (W / 2 ) g * 4 V^2
KE2 / KE1 = 2
The lorry traveling at twice the speed has twice the KE
4 times energy due to speed but 1/2 the mass
Lorry 2 has more kinetic energy than Lorry 1.
To compare the kinetic energy of the two lorries, we use the formula for kinetic energy:
Kinetic Energy (KE) = 1/2 * mass * [tex]velocity^2[/tex]
Let's assume the following:
Lorry 1 (L1) has a mass of M kg and a velocity of V m/s.
Lorry 2 (L2) has a mass of half of L1's mass, so its mass is (1/2)M kg, and it has a velocity of 2V m/s.
Now, let's calculate the kinetic energy for each lorry:
For Lorry 1 (L1):
KE1 = 1/2 * M * [tex]V^{2}[/tex]
For Lorry 2 (L2):
KE2 = 1/2 * (1/2)M * [tex](2V)^2 = 1/2 * (1/2)M * 4V^2 = 2 * (1/2 * M * V^2) = 2 * KE1[/tex]
From the calculations, we can see that the kinetic energy of Lorry 2 (KE2) is double the kinetic energy of Lorry 1 (KE1).
So, even though Lorry 2 is moving at twice the speed of Lorry 1, its kinetic energy is higher because it also has half the weight (mass) of Lorry 1. The increased speed of Lorry 2 contributes more to its kinetic energy than the decrease in mass.
Therefore, Lorry 2 has more kinetic energy than Lorry 1.
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Drag each label to the correct location.
The atomic number and the mass number of atoms relate to their numbers of protons and neutrons. Use what you know
about mass numbers and atomic numbers to complete the table.
Name
Atomic Number
Number of
Protons
Number of
Neutrons
Mass Number
helium
2
2
4
carbon
6
6
12
les
oxygen
8
8
16
sodium
11
11
12
chlorine
17
17
35
Answer:
Atomic Mass number of helium is 4.0
Atomic mass number of carbon 12.0107
Answer:
this is from edmentum.
Explanation:
Which statement is a description of Charles's law?
The temperature and volume of a gas are directly proportional when pressure is constant.
• The temperatung and volume of a gas are inversely proportional when pressure is constant.
The volume and pressure of a gas are directly proportional when temperature is constant.
O The volume and pressure of a gas are inversely proportional when temperature is constant.
Answer:
the temperature and volume
Based on Newton’s law of universal gravitation, complete the following table. Distance increases mass increases distance decreases mass decreases.
When mass increases and distance reduces, gravity rises. Gravity also lowers when the distance between two points grows and the mass decreases.
What is Newton's law of gravitation?Newton's law of gravity states that each particle having mass in the universe attracts each other particle with a force known as the gravitational force.
Gravitational force is proportional to the product of the masses of the two bodies and inversely proportional to the square of their distance.
When mass increases and distance reduces, gravity rises. Gravity also lowers when the distance between two points grows and the mass decreases.
Hence we may deduce that when mass rises and distance reduces, gravity increases. Gravity also lowers when the distance between two points grows and the mass decreases.
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Can we determine what causes change and what are the effects on living and non-living systems?
Answer:
Life Science Living things cause changes on Earth. Living things function and interact with their physical environments. Living things cause changes in the environments where they live; the changes can be very noticeable or slightly noticeable, fast or slow.
Explanation:
Please mark me as brainliest
A guitar string vibrates with an unknown frequency. If the the guitar string is played along with a 440 Hz tuning fork, a beat frequency of 5 Hz is heard. What are the possible frequencies the guitar string could be vibrating at?
This question involves the concept of the beat frequency.
The possible frequencies of the guitar string could be "445 Hz" (or) "435 Hz".
Beat FrequencyWhen two sounds with a very minor difference in their frequency are played, they produce a frequency equal to the absolute value of the difference between their frequencies. This frequency is known as beat frequency.
[tex]f_b=|f_1-f_2|[/tex]
where,
[tex]f_b\\[/tex] = beat frequency = 5 Hzf₁ = frequency of first guitar string = 440 Hzf₂ = possible frequencies of other string = ?Therefore,
5 Hz = |440 Hz - f₂|
f₂ = 440 Hz ± 5 Hz
f₂ = 445 Hz (OR) 435 Hz
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While vacationing in the mountains you do some hiking. In the morning, your displacement is S⃗ morning= (2200 m , east) + (4000 m north) + (100 m , vertical). Continuing on your hike after lunch, your displacement is S⃗ afternoon= (1300 m , west) + (2500 m , north) - (300 m , vertical).At the end of the hike, how much higher or lower are you compared to your starting point? What is the magnitude of your net displacement for the day?
Answer:
a
The hiker (you ) is 200 m below his/her(your) starting point
b
The resultant displacement in the north east direction is
[tex]a = 6562.0 \ m [/tex]
The resultant displacement in vertical direction (i.e the altitude change )
[tex]b =6503.1 \ m [/tex]
Explanation:
From the question we are told that
The displacement in the morning is [tex]S_{morning} = (2200 \m , east) + (4000\ m\ north) + (100 \ m ,\ vertical)[/tex]
The displacement in the afternoon is [tex]S _{afternoon}= (1300\ m ,\ west) + (2500 \ m ,\ north) - (300\ m ,\ vertical)[/tex]
Generally the direction west is negative , the direction east is positive
the direction south is negative , the direction north is positive
resultant displacement is mathematically evaluated as
[tex](2200 \m , east) +( - 1300\ m ,\ west) = 900 \ m \ east[/tex]
[tex](4000\ m\ north) + (2500 \ m ,\ north) = 6500 \ m ,\ north[/tex]
[tex](100 \ m ,\ vertical) - (300\ m ,\ vertical) = -200 \ m[/tex]
From the above calculation we see that at the end of the hiking the hiker (you) is 200 m below his/her(your) initial position
Generally from Pythagoras theorem , the resultant displacement in the north east direction is
[tex]a = \sqrt{900^2 + 6500^2}[/tex]
=> [tex]a = 6562.0 \ m [/tex]
Generally from Pythagoras theorem , the resultant displacement in vertical direction (i.e the altitude change )
[tex]b = \sqrt{6500^2 +(-200)^2 }[/tex]
=> [tex]b =6503.1 \ m [/tex]
Wave length of a infra red wave
Answer:
780 nm - 1000 µm.
Explanation:
i surched it up
Why Newton's Law of cooling not applicable for higher temperature differences?
Newton's Law of Cooling is a simplification based on the assumption that the rate of energy flow is proportionate to the temperature difference.
Radiative energy flow becomes essential at very high temperature differences, and this is proportional to the difference in temperatures raised to the fourth power.
Find the mass of 250 mL of water. The density of water is 1 g/mL.
Answer:
The answer is 250 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 250 mL
density = 1 g/mL
So we have
mass = 250 × 1
We have the final answer as
250 gHope this helps you
A force of 20 N acts upon a 5 kg block. Calculate the acceleration of the object.
Answer:
The answer is 4 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
where
f is the force
m is the mass
From the question we have
[tex]a = \frac{20}{5} \\ [/tex]
We have the final answer as
4 m/s²Hope this helps you
Tides can be used to convert kinetic energy into what kind of energy?.
Answer:
As most economies witness rapid expansion, demand for power is projected to increase significantly. Though most economies have invested in fossil fuels, renewable and sustainable sources present great possibilities for cheap and reliable electricity. One energy resource that ranks among the top renewable and sustainable sources is tidal energy.
Tidal energy or tidal power is a form of renewable energy obtained due to alternating sea levels. The kinetic energy from the natural rise and fall of tides is harnessed and converted into electricity. Tides are caused by the combined gravitational forces of the moon, sun, and earth. However, tides are influenced most by the moon. The moon’s gravitational force is so strong that it tugs the ocean into a bulge. The high and low tides create tidal currents, which are essential in the generation of this kind of energy, mostly prevalent in coastal areas.
23. Which of the following substances could
be expected to provide the greatest relief
for an acid stomach?
(1) bottled spring water
(2) baking soda in water
(3) lemonade
(4) salt water
(5) strong coffee
Answer:
(2) baking soda in water
Explanation:
The substance could be expected to provide the greatest relief for an acid stomach is baking soda in water. The correct option is (2).
What is baking soda?Baking soda, also known as sodium bicarbonate is a popular ingredient for baking purpose. It helps giving foods like bread, cakes, muffins, and cookies a light and fluffy texture.
When a person has a bloated stomach, he has to take in some soda in anyways to relief.
Soda can be taken as ENO or soda flavored from soda shops.
So, one must take baking soda in water to provide the greatest relief
for an acid stomach
Thus, the correct option is (2).
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A substance with high specific heat heats and cools quickly.
TRUE
FALSE
Answer:
False
Explanation:
Something with high specific heat cooling down would take longer to heat up.
Please answer correctly.
Will give the brainliest!
Urgent!!!
Answer:
A. Piccolo
B. The flute would usually have the highest pitch, but because the piccolo is half the size of a flute, it's higher pitched. The piccolo in C has a range from D5 – C8 which is pretty high pitched. This means that the piccolo's range is an octave above that of the flute.
C. The human ear naturally picks out higher notes, so when piccolos play extremely high, we can hear them more easily than the other instruments in a band or orchestra.
D. I'm sorry but I don't know this one.
Ella has 80 marshmallows and she gives some to her friend. how many marshmallows did Ella give her friend? She now has 65 marshmallows.
Answer:
15 marshmallows to her friend.
Explanation:
Answer:
80 - 65 = 15
Explanation:
Ella starts off with 80 then gives some to her friend. She now has only 65 meaning she lost 15 marshmallows. Therefore we would do 80 - 65 = 15.
A soccer ball is kicked horizontally off a 24.0 meter high hill and lands a distance of 33.0 meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball.
Answer:
ten minutes fakfdxjjnox
Answer:
Question:
A soccer ball is kicked horizontally off a
22.0
meter high hill and lands a distance of
35.0
meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball.
Projectile:
The projectile motion is a combination of uniform motion and uniform acceleration motion. When an object is thrown with a velocity (v) then, the horizontal component of the velocity (
v
h
) does not change with respect to time and therefore, the following relation holds valid for the horizontal motion:
S
p
e
e
d
=
S
p
e
e
d
T
i
m
e
The vertical component of the velocity (
v
v
) changes at the rate of
g
=
9.81
m
/
s
2
and therefore, the equations of motion are used to study the vertical motion of the object. These equations are customized for the vertical motion as:
v
=
u
+
g
t
s
=
u
t
+
0.5
g
t
2
v
2
−
u
2
=
2
g
s
For an object thrown with a horizontal velocity, the initial vertical component of the velocity will be zero. In that case, the vertical distance traveled by the object in time (t) will be,
s
=
0.5
g
t
2
⇒
t
=
√
2
s
g
Answer and Explanation:
Given:
Height of the hill,
H
=
22
m
The horizontal distance covered by the ball before it lands,
d
=
35
m
Calculating the time taken by the ball to hit the ground,
t
=
√
2
H
g
=
√
2
(
22
)
9.81
=
2.12
s
Calculating the initial horizontal velocity of the ball,
V
=
d
t
=
35
2.12
=
16.51
m
/
s
which is the answer.
Explanation:
How do scientists use the evidence they gather?
A. The evidence helps scientists write new laws for people to follow.
B. The evidence helps scientists come up with explanations about
the natural world.
C. The evidence proves that scientists are always right.
D. The evidence supports scientists' personal opinions about politics.
SUNT
Answer: B
The evidence helps scientists come up with explanations about
the natural world.
When making a research, scientists use the scientific method to collect enough evidence in an experiment related to a hypothesis, the results aiming to support or contradict a theory.
Human eye forms an ____________ image on _________after passing through the lens
Answer:
inverted images
retina
Answer:
I hope the answer may help you
A ball is thrown vertically upward with an initial velocity
of 29.4 meters
per
second. What is the maximum height
reached by the ball? [Neglect friction.]
O a
29.4 m
O b
14.7 m
O c
88.1 m
O d
44.1 m
Answer:
D
Explanation:
First we define our variables
V0=29.4
a=-9.8
V=0
We have to find the maximum displacement , which I will define as X
We use formula v^2=v0^2+2aX
All we do is substitute our values
0=29.4^2-19.6X
29.4^2=19.6X
X=29.4^2/19.6=44.1
Which line on the graph represents the accumulation of stable atoms during the decay of a radioactive substance?
Answer:
B. Orange Line
Explanation:
Edge 2021
What was the narrator referring when he said that the flood risk to tokyo sounded like something out of a disaster movie?
Answer:
A flood could hit Tokyo so quickly that the levee could break. In a short amount of time, this breach, or break, could cause severe damage to Tokyo’s infrastructure, like a flood in a Hollywood disaster movie. Because Tokyo is home to a large population, a flood could cause massive damage to homes, businesses, and life.Explanation:
If an object has two forces acting on it, how can the net force equal zero?
Physical Science
Answer:
If they have the same net force
Explanation:
Explanation: The net force is the total amount of force acting on an object. It becomes 0 when the forces are equal, canceling each other out (or balancing them - same thing).
A ball is thrown vertically upward with an initial velocity of 29.4 meters per second. What is the maximum height reached by the ball?
Answer:
The maximum height reached is approximately 44.1 meters
Explanation:
The upward (vertical) velocity of the ball = 29.4 meters per second
The equation of the vertical motion of the ball under gravity, is presented as follows;
v² = u² - 2 × g × s
Where;
v = The final velocity of the ball = 0 at maximum height
u = The initial vertical velocity with which the ball was thrown= 29.4 m/s
g = The acceleration due to gravity ≈ 9.8 m/s²
s = The height reached by the ball = [tex]s_{max}[/tex] at maximum height
∴ 0 = 29.4² - 2 × 9.8 × [tex]s_{max}[/tex]
29.4² = 2 × 9.8 × [tex]s_{max}[/tex] = 19.6·[tex]s_{max}[/tex]
[tex]s_{max}[/tex] = 29.4³/19.6 = 864.36/19.6 = 44.1 meters
[tex]s_{max}[/tex] = The maximum height reached = 44.1 meters.
The maximum height reached by the ball is 43.2 meters.
Using the formula:
v² = u² + 2gH
where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity and H is the height.
At maximum height, v = 0. Given that u = 29.4 m/s, g = -10 m/s (moving upward). Hence:
0² = 29.4² + 2(-10)H
20h = 29.4²
h = 43.2 meters
The maximum height reached by the ball is 43.2 meters.
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