Using the rules for significant figures, what do you get when you multiply 67.6 by 1.2?
Answer:
81
Explanation:
The problem here is to use the rules for significant figures in the multiplication below.
67.6 x 1.2:
This product will yield an answer that will produce the least number of significant figures.
67.6 has 3 significant figures; 6, 7 and 6
1.2 has 2 significant figures; 1 and 2
The product must give us an answer of two significant figures:
67.6 x 1.2 = 81.12 to 2significant figures gives 81
The solution to this problem is 81
Which type of employee would most likely spend the majority of work time in a vehicle? O a Corrections Officer at a jail O a Dispatcher at a police department O a Paramedic for a fire department O a Bodyguard for a movie star
C. Paramedic for a fire department
A Paramedic for a fire department is the type of employee would most likely spend the majority of work time in a vehicle. Hence, option C is correct.
What does the fire department do?putting out fires in their vicinity. preserving property and life in the event of localized flames. saving and safeguarding individuals in the event of a car accident, as well as in the event of other catastrophes.
An institution that offers services for fire prevention and suppression is known as a fire department or fire brigade. It is also sometimes referred to as a fire authority, fire district, fire and rescue, or fire service.
The name used in contemporary legislation and by government agencies for this is a fire and rescue service.
Thus, option C is correct.
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A Stone thrown from the top of a building is given an initial velocity Of 20.0 metre per second straight upward determine the time in second at which the stone reaches its maximum height. ( Take sec2 g=9.8m/s)
A) 2.8
B) 2.04
C) 1.67
D) 2.7
We know that,
[tex]{\boxed{\sf{v=u+gt}}}[/tex]
[ Put values ]
[tex]\begin{gathered} \implies \sf \: {0} \: = {20} + ( - 9.8) \times t \\ \\ \implies \sf \: 0 = 20 - 9.8t \\ \\ \implies \sf \: 9.8t = 20 \\ \\ \implies \sf \: t = \dfrac{20}{9.8} \\ \\ \implies \sf \: t = 2.04\end{gathered}[/tex]
Therefore, the time at which the stone reaches its maximum height will be 2.04 s.
A skateboarder starts at point A on the ramp and rises to point B, a maximum height of h = 3.01 m above the top of the ramp.If the amount of work done against friction is insignificant, determine his initial speed (in m/s) at point A
Answer:
7.68m/s
Explanation:
At point A, height h= 0m where v=?
At point B, height of h = 3.01 m above the top of the ramp v= 0 m/s
The conservation of energy here will be energy at Point A equals energy at point B
g= acceleration due to gravity= 9.81m/s^2
(mgh + 1/2 mv^2)A = (mgh + 1/2 mv^2)B
✓But height h at point A= 0 m then energy at point A= 1/2 mv^2
✓At point B , the velocity v= 0 m/s, then Energy at point B= mgh
✓ if we equate both energy at point A and B we have
mgh=1/2 mv^2
Let us make v the subject of formula, and cancel out the "m"
v=√2gh
Then substitute the values
V= √2×9.81×3.01
V=7.68m/s
Hence, his initial speed (in m/s) at point A is 7.68m/s
What kind of situation can you think would be a benefit of reducing friction?
Answer:
Wear and tear of an object is not desirable as it reduces its life. This is more so in case of moving parts in automobiles and machinery. Therefore, efforts are made to reduce friction between moving parts. Friction between moving parts is usually reduced by introducing a substance between the moving surfaces.
Explanation:
who was first person who envisaged a telescope to see the objects far away
Answer:
Hope the above picture might help you :)
The data table shows how the amplitude of a mechanical wave varies with
the energy it carries. Analyze the data to identify the mathematical
relationship between amplitude and energy. Use your equation to find the
energy if the amplitude is 9 units.
Amplitude
Energy
1 unit
2 units
2 units
8 units
3 units
18 units
4 units
32 units
Answer:
162 units
Explanation:
Just did it on A pex
The equation for the energy from the data table shows how the amplitude of a mechanical wave varies with the energy it carries is E = 2 × A², and the energy, if the amplitude is 9 units, is 36 units.
What is a wave?The disturbance oscillates periodically (see the periodic motion) with a set frequency and wavelength in the simplest waves. While electromagnetic waves (see electromagnetic radiation) do not require a medium to travel through and can move through a vacuum, mechanical waves, like sound, need one. The characteristics of the medium determine how well a wave travels through it.
Given:
The energies are, 2, 8, 18, 32
The amplitudes are, 1, 2, 3, 4
Calculate the energy at 9 of amplitude as shown below,
The general formula can be E = 2 × A²
Here, A is the amplitude, and energy is E,
Plug the value of the amplitude
Energy = 2 × 9²
Energy = 2 × 18
Energy = 36
Thus, the energy is 36.
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A batter hits a ball and it is caught 4 seconds later 100 m from home plate. What is the initial velocity (vector!!!) of the ball?(Note: the ball is hit and caught at the same distance from the ground.
Answer:
The initial velocity vector of the ball is;
[tex]\underset{u}{\rightarrow}[/tex] = 25·i + 19.6·j
Explanation:
The given parameters are;
The time of flight of the ball = 4 seconds
The horizontal distance from the plate at which the ball is caught = 100 m
Let 'u', represent the initial velocity, we have;
u × cos(θ) × t = u × cos(θ) × 4 s = 100 m
u × cos(θ) = 25 m/s...(1)
[tex]t = \dfrac{2 \cdot u \cdot sin(\theta)}{g} = \dfrac{2 \cdot u \cdot sin(\theta)}{9.8 \ m/s^2} = 4 \ seconds[/tex]
∴ 2·u·sin(θ) = 9.8 m/s² × 4 s = 39.2 m/s
[tex]\therefore \dfrac{2 \cdot u \cdot sin(\theta)}{u \cdot cos(\theta)} = 2 \cdot tan(\theta) = \dfrac{39.2 \ m/s}{25 \ m/s} = 1.568[/tex]
tan(θ) = 1.568/2 = 0.784
θ = arctan(0.784) ≈ 38.096°
The direction of the velocity vector of the ball, θ ≈ 38.096°
From equation (1), we have;
u × cos(θ) = 25 m/s
∴ u = 25 m/s/cos(θ) = 25 m/s/cos(arctan(0.784)) = 31.7672787629 m/s
The magnitude of the initial velocity vector, u = 31.7672787629 m/s
The vertical component of the initial velocity, [tex]u_y[/tex] = u × sin(θ)
∴ [tex]u_y[/tex] = 31.7672787629 × sin(arctan(0.784))
Therefore, the initial velocity vector of the ball is approximately, v = 31.767 m/s in a direction 38.096° above the horizontal, from which we have;
u = uₓ·i + [tex]u_y[/tex]·j = 25·i + 19.6·j
[tex]\underset{u}{\rightarrow}[/tex] = 25·i + 19.6·j
Two positive point charges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on each other when their separation is 1.0 m
Two positive points charges repel each other with force 0.36 N when their separation is 1.5 meter . Then the force exerted by two charges when the distance is 1.0 meter is 0.8 N.
Calculation:
R1 = 1.5 meter
R2 = 1 meter
F1 = 0.36 N
F1/F2 = R2^2/R1^2
F2 = R1^2/R2^2 × F1
F2 = 2.25 / 1 × 0.36
F2 = 0.81
What is electrostatic force ?Electrostatic force is type of force which act between two charges it is repulsive or attractive in nature. If both charge in same type then it will be repulsive and when both are in opposite nature then it will be attractive in nature.
Mathematically,
F = k× Q1× Q2/r^2
So,
In above problems
R1 = 1.5 meter
R2 = 1 meter
F1 = 0.36 N
F1/F2 = R2^2/R1^2
F2 = R1^2/R2^2 × F1
F2 = 2.25 / 1 × 0.36
F2 = 0.81
Therefore, Two positive points charges repel each other with force 0.36 N when their separation is 1.5 meter . Then the force exerted by two charges when the distance is 1.0 meter is 0.8 N.
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A force of 100.0N accelerates a 5.0 kg box at 15.0 m/s^2 along a level surface. Find the coefficient of sliding friction for the box. After that, how far will the box have gone after 5.0 seconds of pulling it?
By balancing the force, we get :
100 - Frictional Force = ma
100 - μmg = ma
100 - μ(5)(10) = (5)(15)
50μ = 25
μ = 0.5
Distance travelled by box in 5 seconds is :
[tex]d = ut + \dfrac{at^2}{2}\\\\d = 0 + \dfrac{15\times 5^2}{2}\\\\d = 187.5\ m[/tex]
Hence, this is the required solution.
WILL MARK BRAINLIST!!! only for correct answer
NEED CORRECT ANSWER ASAPPP for each question
4. Which of the following is the best example of diffraction?
a. Your voice echoing back when you shout into a canyon
b. A straw appearing to bend when you place it in a glass of water
C. A prism breaking a beam of light into its component colors
d. The music on your stereo getting louder when you turn up the volume
5. What is the main difference between refraction and diffraction?
a. Refraction is a phenomenon that affects light; diffraction is a phenomenon that affects
sound.
b. Refraction involves the bending of light; diffraction involves the bending and spreading
of light, usually around an obstacle.
c. Refraction usually happens in the atmosphere; diffraction usually happens closer to the
earth's surface.
d. Refraction involves changes to the density of light; diffraction involves changes to the
speed of light.
Answer:
I think the answer is C. for 4. and then B. for 5.
A 10.0-kilogram block rests motionless on a horizontal, frictionless table. How
much work must be done to accelerate the block to a speed of
5.00 meters per second?
Answer:125 J
Explanation:
Given
Mass of block [tex]m=10\ kg[/tex]
Initial velocity [tex]u=0\ m/s[/tex]
Final velocity [tex]v=5\ m/s[/tex]
According to the work-energy theorem, work done by all the forces is equal to the change in kinetic energy.
As the block is on the horizontal surface so, the work done by gravity is zero.
Work(W)=change in kinetic Energy
[tex]W=\dfrac{1}{2}m[v^2-u^2]\\W=\dfrac{1}{2}\times 10\times [5^2-0^2]=125\ J[/tex]
A wrench is accidentally dropped from the top of a mast on a sailboat. Will the wrench hit at the same place on the deck whether the sailboat is at rest of moving with a constant velocity
Answer:
Yes, because the wrench is moving at the same speed as the sailboat.
The main difference is that a person on the ground would see the wrench moving diagonally, while a person on the boat would see the wrench falling straight down,
This difference in paths lead to the relativistic change in lengths.
a lamp consumes 1000 J of electrical energy in 10s what is the power ?
Answer:
the power of the lamp is 100 Watts
step by step explaining:
work done = energy consumed by the lamp = 100J
time = 10 seconds
power = 100 / 10 = 100J - 1 = 100w
[tex] \bf \underline{ \underline{Given}}[/tex]
Work,W = 1000 J Time taken,t = 10 s[tex] \bf \underline{ \underline{To \: find \: out}}[/tex]
Calculate the power of lamp.
[tex] \bf \underline{ \underline{Solution}}[/tex]
Formula of power is work done divide by time taken.
[tex] \boxed{ \bf \: Power = \frac{work}{time} }[/tex]
[tex] \blue \bigstar \bf \: Putting \: the \: given \: values[/tex]
[tex] \implies \bf Power = \cancel \dfrac{1000}{10} [/tex]
[tex] \implies \bf \: Power = 100 \: watt[/tex]
An object with mass 'm' is moving in a circle of radius 'R' at a constant speed of 'v.' The acceleration of the object will INCREASE if _____. List all that apply ... .
Answer:
Explanation:
The acceleration of an object is given by the formula
a = v²/r
The acceleration of the object is bound to increase, if and only if the following are changed as well.
The mass of the object is increased,
The speed of the object is increased,
The radius of the object is contrarily decreased
Taking another look at the formula, we see that if we increase the speed of the object, it increases the acceleration. And since the radius is in the denominator, it has to be reduced for the acceleration to increase
Which is a correct description of Hooke's law?
-The force applied to a spring equals the product of the spring constant and the displacement.
-The force applied to a spring equals the spring constant divided by the displacement.
-The spring constant of a spring equals the product of the force applied and the displacement.
-the spring constant of a spring equals the displacement divided by the force applied.
Answer:
The force applied to a spring equals the product of the spring constant and the displacement.
Explanation:
From Hooke's law, the force required to extend or compress a spring by a distance is proportional to the distance. This means extension is proportional to force.
Mathematically it is stated as;
F= -k*x where k is the spring constant and x is the displacement of the spring after adjustment.
Hooke's law is an example of elasticity property of a material which is the ability of the object to return to a normal shape after experiencing a distortion also called "restoring force"
Answer:
Option A
Explanation:
20 points please help!!
Write a hypothesis about the effect of temperature and surface area on the rate of chemical reactions using this format: “If . . . then . . . because. . . .” Be sure to answer the lesson question, “How do the factors of temperature and surface area affect the rate of chemical reactions?”
Answer:
Sample Response: If temperature and surface area increase, then the time it takes for sodium bicarbonate to completely dissolve will decrease, because increasing both factors increases the rate of a chemical reaction.
Explanation:
A 75-kg man is riding in a 30-kg cart at 2.0 m/s. He jumps off in such a way as to land on the ground with no horizontal velocity. The resulting change in speed of the cart is:
Answer:
Explanation:
We shall apply law of conservation of momentum .
M and m be mass of man and boat . V and v be velocity of man and boat .
MV = mv
75 V = 30 v
2 .0 m/s is relative velocity of man wrt boat .
Given v + V = 2
V = 2 - v
75 ( 2 - v ) = 30 v
150 - 75 v = 30 v
150 = 105 v
v = 1.43 m /s
Select the correct answer from each drop-down menu.
We can change a gas to liquid by_______ the temperature and______ the pressure
We can change a gas to liquid by decreasing the temperature and increasing the pressure.
What is phase transition?Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every element and substance has a precise range of temperatures and pressures at which it can change from one phase to another.
Each substance can transform into one of three phases: solid, liquid, or gas. At specific temperatures, every substance is in one of these three phases. The intermolecular forces acting on the material's molecules and atoms have a significant impact on the temperature and pressure at which the substance will change.
When we change a gas to liquid, we have to decrease in the temperature and increase in the pressure for this phase transition.
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Table B:Convection (Cold Water) Time (minutes : seconds) Food Coloring Movement 0:30 1:00 1:30 2:00 2:30 3:00
NEED ASAP
Answer: Did you get the answers to any of this report?
Explanation:
Answer:
1 year later and still not answered....
Explanation:
A homeowner wants to reduce the environmental damage of the energy source used to heat her home.
Which energy source would be best for her to choose?
coal
gas
oil
wind
Answer:
WIND
Explanation:
EDG 2021
If A homeowner wants to reduce the environmental damage of the energy source used to heat her home. Then wind energy source would be best for her to choose. The correct option is D.
What is wind energy?Wind energy is a form of renewable energy that is generated by harnessing the power of the wind to produce electricity.
Wind energy is produced when the kinetic energy of the wind is converted into mechanical energy by wind turbines.
Wind turbines are typically large, tower-like structures with rotor blades that spin in response to the wind, turning a generator that produces electricity.
Wind energy is a clean and sustainable source of energy that does not produce greenhouse gas emissions or air pollution, unlike fossil fuels such as coal, oil, and gas.
Wind energy is also abundant and widely available, with many regions around the world experiencing consistent wind speeds that can be harnessed to generate electricity.
As a result, wind energy has become an increasingly popular source of renewable energy, with many countries investing in wind power as part of their efforts to transition to a cleaner, more sustainable energy system.
Here in the question,
To reduce the environmental damage of the energy source used to heat her home, the homeowner should choose wind energy. Wind energy is a clean and renewable source of energy that does not produce harmful greenhouse gases or air pollution, which can contribute to climate change and negatively impact human health.
In contrast, coal, gas, and oil are all fossil fuels that produce significant amounts of carbon dioxide and other pollutants when burned, contributing to air pollution, climate change, and other environmental problems.
Therefore, wind energy is a better choice for the homeowner who wants to reduce the environmental impact of heating her home.
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Which of the following is evidence that a physical change has
occurred? *
a. Broken glass
b. Rust
c. Bubbles
d. Formation of a solid precipitate
Answer:
Broken glass
Explanation:
Which item rotates in a magnetic field as an electric motor produces kinetic energy.
A. Lightbulb
B. Loop of wire
C. Battery
D. Permanent magnet
Answer:
Loop of Wire
Explanation:
What happens to distance when velocity is doubled
1. Place the following in logical order by writing the numbers 1 through 6 in the spaces provided.
a. analyze the data
b. test the hypothesis
c. form a hypothesis
d. gather information
e. state the problem
f. draw conclusions
Answer:
ecdbaf
Explanation:
The logical order of the steps of the scientific method is as follows:
a. analyze the data -- 5
b. test the hypothesis - 4
c. form a hypothesis - 3
d. gather information - 2
e. state the problem - 1
f. draw conclusions - 6
Each experiment and research uses the scientific method to test their hypothesis or solving the problem. The scientific method is a step-by-step process to acquire knowledge about a particular problem. There are the following steps in the scientific method
1st step - state the question/problem2nd step - gather information3rd step - form a hypothesis4th step - test the hypothesis5th step - analyze the resultsThe final step - draw a conclusionLearn more about the scientific method:
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what do you think president biden should say in his inaugural speech to unify the country’s
Answer:
If you haven't heard, Joe Biden would like to unite America.
It was a focus of the Democrat's campaign. It's even the theme of Biden's inauguration — "America United."
The inaugural committee says the slogan "reflects the beginning of a new national journey that restores the soul of America, brings the country together, and creates a path to a brighter future."
If only it were that easy.
When Biden is sworn in at 12:01 p.m. ET Wednesday as the 46th president of the United States, it will be with the understanding that the country is as divided as it's ever been, as pessimistic as it's been in three decades and facing health, economic and racial crises.
It will also be a very different inauguration than has ever been seen in U.S. history. Four years ago, President Trump was arguing over his crowd size compared with Barack Obama's record-setting turnout of supporters on the National Mall.
Explanation:
btw i would rather have him as president
With what speed would mail pass through the center of the Moon if falling in a tunnel that runs through the center
Answer:
$v_f = = 7.9 \times10^3 \text{ m/s }$
According to the cell theory, which statement is correct? A) Viruses are true cells. B) Cells are basically unlike in structure. C) Mitochondria are found only in plant cells. D) Cells come from preexisting cells.
Answer:
D) Cells come from preexisting cells.
Explanation:
The universal i.e widely accepted cell theory was proposed in 1800's by the contribution of three scientists namely Theodor Schwann, Matthias Schleiden, and Rudolf Virchow. They came together and proposed three main components that make up the cell theory today. The components are:
- All living things are composed of one or more cells.
- Cell is the basic and fundamental unit of life
- All cells come from preexisting cells.
Based on these three components of the cell theory, the statement that: "Cells come from preexisting cells" in the options is correct.
What are the characteristics of open pit mining
Answer:
The dominant feature in an open pit or quarry operation is the pit, a broad, deepened, often funnel-shaped area where overburden has been removed to access the material to be mined. This is where material extraction takes place.
Explanation:
Read my bio :)
Newton's First and Second Laws of Motion:Question 3Kepler-10b, the first confirmed terrestrial extrasolar planet, is about 564 light-years away from Earth. Kepler-10b is a superearth, meaning it is a little larger and more massive than Earth. It has a surface gravity that is 1.53 times that of Earth. How much thrust would be required to accelerate a 5,000-kg spacecraft 2.13 m/s2 from the surface of Kepler-10b
Answer:
F = 85696.5 N = 85.69 KN
Explanation:
In this scenario, we apply Newton's Second Law:
[tex]Unbalanced\ Force = ma\\Upthrust - Weight\ of\ Space\ Craft = ma\\F - W = ma\\F - mg = ma\\F = m(g + a)\\[/tex]
where,
F = Upthrust = ?
m = mass of space craft = 5000 kg
g = acceleration due to gravity on surface of Kepler-10b = (1.53)(9.81 m/s²)
g = 15.0093 m/s²
a = acceleration required = 2.13 m/s²
Therefore,
[tex]F = (5000\ kg)(15.0093\ m/s^{2} + 2.13\ m/s^{2})\\[/tex]
F = 85696.5 N = 85.69 KN