Answer:
there are 3 significant figures.
Explanation:
significant figures are 3,4,7.
PLEASE READ THIS FIRST SO WE GET THE CORRECT ANSWER
In studies about new medicines, researchers usually give one group of patients the medicine that is designed to treat an illness. They give another group of patients a placebo, which is taken the same way as the medicine but does not actually contain the ingredients of any medicine. Different medicines are tested in different experiments, but the placebos usually contain the same non-medical ingredients. If both groups of patients are healed, then researchers cannot be sure whether the medicine caused improvement, but if the group given the medicine is healed while the group given the placebo remains ill, researchers can conclude that the medicine causes the illness to go away.
IN MEDICAL EXPERIMENTS, WHICH GROUP RECEIVES PLACEBOS?
A.the experimental group
B.the control group
C.both the experimental and control groups
D.neither the experimental nor control group
Answer:
B=the control group
Explanation:
Answer:
B
Explanation:
How much is the unit price for an order of 80 t-shirts that cost $300?
help me plisssssssss!!!!!!!!
Unit price = (total cost) / (number of units) . . . The unit is 'dollars per shirt'.
Unit price = ($ 300) / (80 shirts)
Unit price = $3.75 / shirt
A satellite in space has a mass of 252 kg. The engines on it provide a net force of 6.81×10-3 N. How long will it take for this satellite to go from rest to a final velocity of 262 m/s forward?
Acceleration = (force) / (mass)
Acceleration = (6.81 x 10⁻³ N) / (252 kg)
Acceleration = 2.70 x 10⁻⁵ m/s²
Time = (change in v) / (acceleration)
Time = (262 m/s) / (2.70 x 10⁻⁵ m/s²)
Time = 9,703,704 seconds
That's 2,695.5 hours , or 112.3 mean solar Earth days .
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Answer:
number 2!
Explanation:
Answer:
2s to 4s
Explanation:
Since the graph measures acceleration over time, when the line does not move up or down is when you can see a constant velocity.
1. Why should you use scientific notation when writing big numbers?
Answer:
It helps the answer look clean. It also makes the work easier to work with.
Explanation:
Instead of writing a lot of zeros, all you have to do is add exponents to the number to show how much the decimal moved.
Telling what the weather is an:
-Inference,
-prediction, or
-observation
Answer:
observation
Explanation:
an inference is making an educated guess
a prediction and making a guess about what will happen next
A little girl riding a train rolls a ball toward the back of the train at 1.25 m/s NE. The train is traveling at a velocity of 13.22 m/s SW. The little girl's brother runs from the back of the train, toward the rolling ball at a velocity of 1.45 m/s SW. Relative to the little girl's brother, what is the velocity of the rolling ball?
Answer:
Answer: 2.70m/s NE
Explanation:
Just did it.
A bike moves. 50 m in 10 seconds calculate the speed of the bike
Answer:
We know that
Speed = Distance/ Time
Explanation:
Distance is 50 mTime is 10 secondsSpeed = 50/10
= 5 m/s
A giraffe, standing 6.00 m tall, bites a branch off a tree to chew on the leaves
and lets the branch fall to the ground. How long does it take the branch to hit
the ground?
Answer:
1.11 s.
Explanation:
From the question given above, the following data were obtained:
Height (H) = 6 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =.?
The time taken for the branch to hit the ground can be obtained as follow:
H = ½gt²
6 = ½ × 9.8 × t²
6 = 4.9 × t²
Divide both side by 4.9
t² = 6/4.9
Take the square root of both side
t = √(6/4.9)
t = 1.11 s
Therefore, it will take 1.11 s for the branch to hit the ground.
An airplane is seller rates down a runway at 3.10 M/S squared 441.5 seconds from rest until finally left off the ground ,what is the displacement before takeoff
Answer:
302129m
Explanation:
Using s= ut + 1/2at²
But u= 0
So
S= 1/2(3.1)(441.5)²
=302129m
How do you line up vectors so you can add them?
Answer:
The head-to-tail method of adding vectors involves drawing the first vector on a graph and then placing the tail of each subsequent vector at the head of the previous vector. The resultant vector is then drawn from the tail of the first vector to the head of the final vector.
Explanation:
in which state of matter are particles spread farthest apart from another?
Gas particles are farthest apart from eachother.
Solid particles are tightly packed.
Liquid particles are somewhat loose.
Gas particles are rapidly moving and are farthest apart.
:D
Gas particles are spread farther apart from each other.
What is gas and its characteristics?Gas is a state of matter that has no fixed shape and no fixed volume.
Gases have a lower density than other states of matter, such as solids and liquids.
There is a great deal of empty space between particles, which have a lot of kinetic energy and aren't particularly attracted to one another.
The main characteristics of matter are:
(1) they are easy to compress,
(2) they expand to fill their containers, and
(3) they occupy far more space than the liquids or solids from which they form.
In a gas, particles are in continual straight-line motion.
The kinetic energy of the molecule is greater than the attractive force between them, thus, they are much farther apart and move freely of each other.
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Which phrase describes a scientific law?
Answer:
a scientific law must be universally correct there could be no contradictions regarding the law anywhere
1. A gas has a volume of 300 mL at 40 kPa of pressure. What will its volume be if the pressure is changed
to 80 kPa?
How to work it out?
Answer:
V₂ = 150 mL
Explanation:
Given that,
Initial volume of a gas, [tex]V_1=300\ mL[/tex]
Initial pressure, [tex]P_1=40\ kPa[/tex]
We need to find the volume of gas if the pressure is changed to 80 kPa. Boyle's law states that the relationship between pressure and volume is inverse. Mathematically,
[tex]P_1V_1=P_2V_2[/tex]
[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{300\times 40}{80}\\\\V_2=150\ mL[/tex]
So, the new volume is 150 mL.
You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 29.7 N and the spring scale reads 17.6 N.
Hello. This question is incomplete. The full question is:
You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 29.7 N and the spring scale reads 17.6 N.
What is the magnitude of the force that Earth exerts on the bag?
Answer:
47.3 N
Explanation:
the entire system shown in the question above is at rest. Which greatly facilitates the calculation that we must do. In this case, to measure the magnitude that the force of the earth has on the backpack, you only need to add the two forces that you already know in the system.
In that case, it would be, you should calculate:
F= 29.7 N+ 17.6 N
F= 47.3N
Which is a limitation of using cellulose?
its lack of mass production
its lack of biodegradability
3
its harm to landfills
O its high cost to recycle
Answer:
Its lack of mass production
Explanation:
Your Welcome;)
The limitation of using cellulose is its lack of mass production.
Cellulose is a polymer of glucose. It is obtained from glucose by condensation polymerization to yield a long chain.
Cellulose materials have a high potential of being quite useful as important materials for diverse applications.
However, the problem with cellulose materials is that they can not really be mass produced. This limitation has long encumbered the possibility of using cellulose materials for various applications in material science.
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Describe all of the forces acting on the ice cream in the root beer float. Relate these forces to the fact that the ice cream is floating
Answer: Sample Response: The root beer exerts a force on all sides of the ice cream. These forces are all equal and cancel each other out. Gravity pushes downward on the ice cream. This can also be called the weight of the ice cream. Buoyant force pushes the ice cream upward. The ice cream floats because the buoyant force is greater than the weight of the ice cream.
Answer:
The root beer exerts a force on all sides of the ice cream. These forces are all equal and cancel each other out. Gravity pushes downward on the ice cream. The ice cream floats because the buoyant force is greater than the weight of the ice cream.
Explanation:
Please help Give relationship among centigrade, fahrenheit and kelvin scale
The basic formula is °C + 273.15 = K. The basic formula for converting Fahrenheit into Celsius is (°F − 32) × 5/9 = °C. To convert Fahrenheit degrees into Kelvins, (°F − 32) × 5/9 + 273.15 = K.
Which planets are considered “rocky planets”?
Answer:
There are four rocky, or terrestrial, planets: Mercury, Venus, Earth, and Mars. These planets are called terrestrial planets because they are made up of rocks and metals and have solid surfaces.
Explanation:
Plug variables expressed in SI units in the kinematic equation given in article: a = -v0^2/(2sg). What value of g you get as expressed in g's where g = 9.8 m/s^2 1 point the same as in English units smaller larger this calculation cannot be performed in SI units If the initial velocity of player is doubled then the absolute acceleration would * 1 point decrease 2x stays the same increase 2x increase 4x If stopping distance is decreased 2x then the acceleration would * 1 point decrease 2x stay the same increase 2x increase 4x Other: Hockey player having initial velocity 20 m/s and helmet having padding 5 cm hits head on his twin brother. The acceleration of his brain is most closely equal to * 1 point 0.4g 4g 40g 400g
Answer:
1) acceleration is increased by a factor of four 4X
2) the acceleration increases a factor of 2X
3) the correct answer of 400g
Explanation:
This is a kinematics exercise, where you use the velocity equation to obtain the acceleration, with the final velocity equal to zero.
v² = v₀² + 2 a x
0 = v₀² + 2 a x
a = - v₀² / 2 x
In the case of wanting to give the acceleration as a function of g, we can find the relationship between the two quantities
a / g = - v₀² / (2 x g)
Let's answer the different questions about this equation
1. The initial velocity is doubled, how much the acceleration is worth
a/g = - (2v₀) 2 / 2xg
a = 4 (-v₀² / 2xg) g
acceleration is increased by a factor of four 4X
2. if the stopping distance is reduced by 2, that is, x = x₀ / 2
we substitute
a/g = (- v₀² / 2g) 2/x
a =2 (-v₀² / 2x₀g) g
therefore the acceleration increases a factor of 2X
3. the initial velocity of the hockey player is v₀ = 20 m / s and the stopping distance is
x = 5cm = 0.05m
we calculate the acceleration
a / g = - 20² / (2 0.05)
a / g = - 4000 / g
a / g = - 4000 / 9.8 = 408
a = 408 g
the correct answer of 400g, the value matches exactly if g = 10 m / s2 is taken
What's the answer to this question?
Answer:
The barometer is supporting 75 cm of Hg due to atmospheric pressure.
Since the manometer is open to air pressure, the gas pressure is supporting the air pressure plus the 30 cm of Hg.
So the "absolute" gas pressure is 75 + 30 = 105 cm of Hg.
Why is a pendulum hanging off another pendulum called a chaotic system?
Explanation:
If transformations from stabilization are minimal, a double pendulum performs basic geometric motion. The highly nonlinear system, furthermore, becomes radically unstable in its motion as significant displacements are introduced, showing that deterministic processes are not inherently predictable
What tools can you use for measuring mass?
Answer:
With a balance
Explanation:
Such as an electronic balance and a triple beam balance
The tools that one can use for measuring mass are Balance or Scale, Weighing Machine, Triple Beam Balance, etc.
A balance or scale is a frequently used tool for precisely measuring mass. Usually, it consists of a pan or platform where the thing whose mass is being measured is set.
Weighing Machines: Weighing machines are electronic devices that measure mass and are frequently seen in homes and commercial settings.
Mechanical balance with three beams and movable weights, the triple beam balance has three beams.
Digital Kitchen Scale: When baking and cooking, digital kitchen scales are frequently utilised. They offer convenient and quick mass measurements for the constituents, usually presenting the results digitally.
Thus, these are only a few types of mass measurement equipment.
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Boojho saw a cracker burst at night at a distance from his house. He heard
the sound of the cracker a little later after seeing the cracker burst. Give the
reason for the delay in hearing the sound.
Answer:
The primary reason of seeing the cracker burst and hearing the sound later is because the speed of sound and light. Speed of light is in the vicinity of 3*10^8m,/ sec while the speed of sound is at a distance of 332m/sec. It is similar to lightning that strikes before the sound.
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A ball rolling down a hill was displaced 21.9 m while uniformly accelerating from rest. If the final velocity was 7.14 m/s, what was the rate of acceleration?
Answer:
a = 1.16 m/s²
Explanation:
In order to find the acceleration of the ball we will use 3rd equation of motion.
2as = Vf² - Vi²
where,
a = acceleration = ?
s = displacement = 21.9 m
Vf = Final Velocity = 7.14 m/s
Vi = Initial Velocity = 0 m/s (Since, ball starts from rest)
Therefore, using the values, we get:
2a(21.9 m) = (7.14 m/s)² - (0 m/s)²
a = (50.97 m²/s²)/(43.8 m)
a = 1.16 m/s²
D
Cuestion 2
1 pts
A hotwheels car is rolled from 0.72 meters to the 1.51 meter mark. What is the displacement of the toy car?
(do not enter units into your answer in canvas)
Answer:
it is d]
Explanation:
The displacement of the toy car will be 0.79 meters.
What is displacement?The shortest route between two points is displacement.
It is a vector quantity to be displaced. This suggests that it has a size and a direction, and that it may be thought of as an arrow pointing from one place to another.
Distance is never less than displacement; it must always be more than or equal to it.
Displacement can be zero if the starting and end point are the same.
According to the question, the Hot wheel car rolled from 0.72 meters to the 1.51-meter mark.
So, the displacement of the toy car will be :
⇒1.51-0.72
=0.79
Hence, the total displacement will be 0.79 meters.
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Pam is driving a car, and Dave is riding in the front passenger seat. Both are wearing seatbelts. Pam crashes head-on into a concrete barrier driving 50 kph. Assuming that Dave's mass is 1.5 times that of Pam, which statement below describes the force experienced by Dave?
А Dave experiences 3 times the force that Pam experiences.
B Dave experiences 1.5 times the force that Pam experiences.
C Dave experiences the same force as Pam. D Dave experiences half the force that Pam experiences.
Answer:
Option (B).
Explanation:
Given that,
Speed of Pam is 50 km/h
Force acting on an object is given by: F = ma
Pam is driving a car, and Dave is riding in the front passenger seat. Both are wearing seatbelts. As Dave's mass is 1.5 times that of Pam. It means that Dave experiences 1.5 times the force that Pam experiences.
Hence, the correct option is (B).
see attached photo below!
Answer:
0 m/s²
Explanation:
Velocity is the slope of the position vs time graph. The graph is linear, so the velocity is constant. Since the velocity is constant, the acceleration is 0.
Infrequent urination, dry skin, and dizziness are all symptoms of __________.
A. dehydration
B. food poisoning
C. heat stroke
D. sunburn
Answer:
dehydration
Explanation:
what's the meaning of phisikos
A word-forming element meaning "physical, physically; natural," from Latinized form of Greek physikos "natural, physical, pertaining to nature."