Answer:
we use the formula,
[tex]v {}^{2} = u {}^{2} + 2gh[/tex]
[tex]89 {}^{2} = 76 {}^{2} + 2(10)h[/tex]
[tex]h = (89 {}^{2} - 76 {}^{2} ) \div 20[/tex]
h= 107 m
4. Which of the following is equivalent to 800 cm?
a) 80000 nm
b) 8000 mm
c) 8.0x10^7 um
d) 8.0x10^5 km
e) 80 m
Answer:
Explanation:
1 cm =10mm so 800cm is equal to 8000mm.so b is the correct answer
You have 30 L of a liquid. How many gallons is this? (Note: 1 gal/3.79 L)
when you turn on music on your phone, what energy transformation takes place?
Answer:
the Battery of the phone contains chemical energy which transfers Light and Sound energies.
1
A metre rule is used to measure a length
Which reading is shown to the nearest millimetre?
A 0.7 m
B
0.76 m
с
0.761 m
D
0.7614 m
Answer:
the answer is 0.7
Explanation:
because in this this case he asked nearest millimeter so the anwer can be qualified as 0.7 you can covert this into cos tita
A 0.7 m
What is a Metre rule used to measure?A meter ruler is a gadget or a sort of ruler that is used to measure the length and distance of various objects.
A meter rule has a length of one meter, which is equal to one hundred centimeters, as the name suggests.
According to the questions,
On a metric ruler, each individual line represents a millimeter (mm). The numbers on the ruler represent centimeters (cm). There are 10 millimeters for each centimeter. To read a metric ruler, each individual line represents .
As 0.7m = 70cm =700mm
Meter ruler can measure up to 100 cm. As the meter ruler is of 1m.
A metre ruler has a length of one metre, which is equal to one hundred centimetres, as the name suggests. A metre rule, on the other hand, is divided into smaller units called millimetres, with each centimetre divided into ten millimetres.
A metre rule, on the other hand, is divided into smaller units called millimetres, with each centimetre divided into ten millimetres.
As a result, up to one millimetre, a metre rule can be used to measure the shortest length.
A metre rule can be used for more than just measuring distances; it can also be used to draw straight lines and cut blades.
Therefore,
0.7m reading is shown to the nearest millimeter.
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2. It is easier to drag a mat when nobody is sitting on
it, and difficult when a person is sitting on it. Give
reason.
Explanation:
because of the weight of the person sitting on it ...also frictional force increases
1. What are the ways that scientists answer questions and
solve problems?
a. physical science
b. physics
C. observations
d. scientific methods
Answer:
C. observations
Explanation:
a scientist have to observe somethng to find the answers or solve problems
What is the slope of the line plotted below? (-2,-1) (4,2) A. 1 B. 2 C. -0.5 D. 0.5
Answer: D. 0.5
Explanation:
The slope formula is y2-y1/x2-x1.
2-(-1)/4-(-2) = 2+1/4+2
2+1/4+2 = 3/6 = 1/2
1/2 = 0.5
The slope is 1/2, or 0.5.
Raul started out on his bike thirty meters to the south of my position. Five
seconds later, he was twenty meters to the north. How fast is Raul biking. Write
an equation to find his displacement, x, from the time, t. If he keeps going at the
same rate, where will he be one minute (sixty seconds from) when he started?
Answer:
Let's define the North as the positive y-axis.
At t = 0s (t is the variable of time) we know that Raul is 30m at the South, so in our system, the position of Raul at t = 0s is:
p(0s) = -30m
After 5 seconds, at the time t = 5s, we know that the position of Raul is 20m at the North, so now the position is:
p(5s) = 20m.
a) First, speed is calculated as distance over time, or:
S = ( p(5s) - p(0s))/5s = (20m - (-30m))/5s = 50m/5s = 10m/s.
b) The displacement is defined as the difference between the final position and the initial position:
Displacement = p(5s) - p(0s) = 20m - (-30m) = 50m.
Now, knowing the speed is 10m/s, we can write the movement equation as:
p(t) = 10m/s*t + p(0s) = 10m/s*t - 30m
So the displacement at a time t is:
D = p(t) - p0s = 10m/s*t - 30m - (-30m) = 10m/s*t
c) the position one minute after he started will be:
p(1min)
But we have our equation in seconds, so we write 1min = 60s
p(60s) = 10m/s*60s - 30m = 600m - 30m = 570m
Sebuah vektor gaya sebesar 40 N membentuk sudut 30° terhadap sumbu x positif. Komponen-komponen vektor tersebut terhadap sumbu x dan sumbu y adalah … N (Sin 30°= 1/2 √3 ; Cos 30°= 1/2) *
Answer:
Explanation:
Given that the force 40N F acting on the Cartesian x and y coordinates and forming an angle of 30 ° to the positive x-axis, the vector of the force component about the horizontal and vertical axes will be expressed as shown;
For the component force x;
Fx = Fcostheta
You know that F = 40N and theta = 30 °
Fx = 40cos30 °
Fx = 40 * √3 / 2
Fx = 40√3 / 2
Fx = 20√3 N
For the component force y;
Fy = Fsintheta
You know that F = 40N and theta = 30 °
Fy = 40sin30 °
Fy = 40 * 1/2
Fy = 20 N
Therefore, the vector components with respect to the x-axis and the y-axis are 20√3 N and 20N, respectively.
""When we were discussing thermodynamics the other day, Dave didn't say anything. That must mean he doesn't know anything about the topic." What would be the most useful question to debunk this claim?"
Answer
the most useful question to debunk this claim is
Could there be another reason why Dave remained quiet?
Explanation:
Because its possible Dave could have known something but he choose to be quite because of another reason, as thus will debunk that he knows nothing about the topic
If a violin string vibrates at 248 Hz as its fundamental frequency, what are the frequencies of the first four harmonics?
Answer:
The frequencies of the first four harmonics are 248 Hz, 496 Hz, 744 Hz, and 992 Hz
Explanation:
Given;
fundamental frequency, f₀ = 248 Hz
Frequency of the nth harmonic = n x fundamental frequency
First harmonic, f₁ = 1 x f₀ = 248 Hz
Second harmonic;
2f₀ = 2 x 248 Hz = 496 Hz
Third harmonic
3f₀ = 3 x 248 Hz = 744 Hz
Fourth harmonic
4f₀ = 4 x 248 Hz = 992 Hz
Therefore, the frequencies of the first four harmonics are 248 Hz, 496 Hz, 744 Hz, and 992 Hz
An object has a mass of 5 kg and a velocity of 20 m/s. What is the momentum of the object?(1 point)
25 kg⋅m/s
4 kg⋅m/s
100 kg⋅m/s
0.25 kg⋅m/s
Answer:
option C is correct
Explanation:
given mass=5 kg
velocity=20 m/s
momentum,P=m v
p=5*20=100 kg m/s
The momentum of the object is 100kg.m/s
HOW TO CALCULATE MOMENTUM:
The momentum of a substance can be calculated by multiplying the mass of that substance by its average speed or velocity. That is;Momentum (p) = mass (m) × velocity (v)
According to this question, an object is said to have a mass of 5 kg and a velocity of 20 m/s. Hence, the momentum can be calculated thus:p = 20m/s × 5kg
p = 100 kg.m/s
Therefore, the momentum of the object is 100kg.m/s.Learn more: https://brainly.com/question/20644069?referrer=searchResults
A 5.0 kg bike moving 10 m/s comes to a complete stop in 2 seconds. What is the average force of the brakes on the bike?
Answer:
25 N
Explanation:
Force : This is defined as the product of mass and acceleration. The unit of force is Newton or kgm/s².
From the question,
F = ma......................... Equation 1
Where F = Force of the brake, m = mass of the break, a = acceleration.
But,
a = v/t.................. Equation 2
where v = velocity, t = time.
Substitute equation 2 into equation equation 1
F = m(v/t)................ Equation 3
Given: m = 5.0 kg, v = 10 m/s, t = 2 seconds
F = 5(10/2)
F = 25 N.
Hence the average force of the brakes on the bike is 25 N
Answer:
The average force of the brakes on the bike is 25.0 N
Explanation:
The parameters given in the question are,
Mass, m = 5.0kg
Initial velocity, u = 10 m/s
Time, t = 2 sec
Since the bike came to a complete stop, then
Final velocity, v = 0 m/s
To determine the average force of the brakes on the bike; From Newton's second law of motion, Force is given as
F = ma
Where F is the force in N (Newtons)
m is the mass in kg
and a is acceleration in m/s²
Hence, we will first determine the acceleration.
From one of the equations of kinematics for linear motion,
[tex]v = u + at[/tex]
Then, [tex]a = \frac{v - u}{t\\}[/tex]
Putting the given parameters into the above equation, we get
[tex]a = \frac{0 - 10}{2}[/tex]
[tex]a = \frac{-10}{2}\\ a = - 5[/tex]m/s²
The negative sign indicates deceleration since the bike came to a stop,
Hence, [tex]a = 5[/tex] m/s²
From,
F = ma
F = 5.0 × 5
F = 25.0 N
the comparison between gravity and air resistance
Answer:
Objects are affected by gravity the same, but air resistance can affect the speed of an object's descent. An object with more surface area will have more air resistance.
Explanation:
The more surface area the object has to get through the air particles, the slower it will take to fall. ... In space, there is no air
How earth's magnetic field is taken as uniform magnetic field ?
Answer:
It is in contact with two vertical rails which are joined at the top. The rails are without friction and resistance. There is a horizontal uniform magnetic field of magnitude B perpendicular to the plane of the ring and the rails.
Explanation:
Not sure if this is correct but pls give thanks anyway!
briefly discuss the phenomenon of childhood maltreatment in the context of five different psychological perspectives
Answer:
Child maltreatment or child abuse is a phenomenon of sexual, physical, and/or psychological abuse of children.
Five different psychological perspectives of childhood maltreatment are as follows:
Poverty is one of the biggest cause of childhood maltreatment that impact once psychological health.Child do not get proper care from their parents.Childrens are emotionally weak and anything negative thought can depress them.Lack of communication sometimes make children underconfident.Social descrimination on the basis of race and gender can impact a child psychological balance.
The mass of a body on the surface of the earth is 12kg. If acceleration due to gravity on
moon is 1/6 of acceleration due to gravity on earth, then its mass on moon will be:
a)2kg
b)12kg
c)72kg
d)zero
a student wishes to find the volume of a piece of wood of irregular shape. her experiment requires the use of a small brass object of mass 200g. a] calculate the volume of the brass object. the density of brass is 8.4g/cubic cm.
Answer:
Volume, [tex]V=23.8\ cm^3[/tex]
Explanation:
It is given that,
Mass of small object of brass, m = 200 g
The density of brass is 8.4 g/cm³
We need to find the volume of the brass object. Density is equal to mass of an object per unit its volume.
So,
[tex]d=\dfrac{m}{V}[/tex]
V is the volume of the brass object
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{200\ g}{8.4\ g/cm^3}\\\\V=23.8\ cm^3[/tex]
So, the volume of the brass object is [tex]23.8\ cm^3[/tex].
The volume of the brass object is 23.81 cm³.
Density is the ratio of the mass of a body and its volume. The S.I unit is kg/m³
To calculate the volume of the brass, we make use of the formula below
D = m/V................. Equation 1
Where D = density of the brass object, m = mass of the brass object, V = volume of the brass object.
make V the subject of equation 1
V = m/D.............. Equation 2
From the question,
Given: m = 200 g, D = 8.4 g/cm³
Substitute these values into equation 2
V = 200/8.4
V = 23.81 cm³
Hence, The volume of the brass object is 23.81 cm³
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scott travels north 5 miles, then goes west 3 miles, and then goes south for 2 miles.
what is the distance he went?
10 miles
8 miles
7 miles
6 miles
Hi ) how to do this??
Answer:
X = 12N
Explanation:
Anticlockwise moment = Clockwise moment
Taking the moment at the pivot,
Anticlockwise moment = X×2.0m
Clockwise moment = (2.0N × 4.0m) + (4.0N × 4.0m)
Hence, 2X = (8 + 16)
2X = 24
X = 12N.
I HOPE IT'S OK.
How many electrons does an atom have with 10 protons and an ionic charge of 2+
Answer:
8
Explanation:
Charge = protons − electrons
2 = 10 − e
e = 8
A mouse ran 100 centimeters in
20 seconds. What was his speed?
A. 5 cm/s
B. 0.2 m/s
C. 2000 m/s
D. 120 m/s
Explanation:
Speed = 100/20 = 5cm/s
Option A is the correct answer
Speed = Distance/Time, therefore the speed of the mouse is 5 cm/s. Hence, option A is correct.
What is speed?The pace at which a distance changes over time is referred to as speed. It has a dimension of time distance. As a result, the fundamental unit of time and the basic unit of distance are combined to form the SI unit of speed. Thus, the meter per second (m/s) is the SI unit of speed.
You can determine an object's speed if you know how far it moves in a given amount of time. For instance, an automobile is moving at a pace of 70 miles per hour if it covers 70 miles in an hour (miles per hour).
If you know how far something has traveled and how long it took to get there, you can calculate its average speed. Speed is calculated as speed = distance/time. Hence, option A is correct.
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Draw a diagram to show the life-cycle of a
silk moth.
[tex] \huge{ \underline{ \underline{ \green{ \bf{Answer:}}}}}[/tex]
The female silk moth lays eggs. When the eggs hatch a tiny Caterpillar comes out, This is the Silkworm or Larva. The silkworm feeds on leaves and grass. When it is ready to enter the next stage in its lifecycle, it first weaves a net around itself. It then secrets a fibre made up of proteins which hardens on exposure to air. This is the Silk fibre. It covers itself completely with this fibre to form a cocoon at this stage the Larva is called Pupa. The Pupa grows and changes inside the cocoon. A few weeks later the cocoon opens and an adult moth come out.
The Silk yarn is obtained from the cocoon of the silkworm. The breeding and management of silkworms is known as Sericulture.━━━━━━━━━━━━━━━━━━━━
Vanessa runs on the soccer field 20 meters North, then makes a cut to the right going East for 3 meters. What is Vanessa’s displacement from her original spot?
Answer:
20.2 m
Explanation:
Given that Vanessa runs on the soccer field 20 meters North, then makes a cut to the right going East for 3 meters. What is Vanessa’s displacement from her original spot?
The Vanessa displacement can be calculated by using pythagorean theorem.
Displacement = sqrt( 20^2 + 3^2 )
Displacement = sqrt( 400 + 9 )
Displacement = sqrt( 409)
Displacement = 20.2 m
The radius of the planet Saturn is 5.85 ✕ 107 m, and its mass is 5.68 ✕ 1026 kg. (a) Find the density of Saturn (its mass divided by its volume) in grams per cubic centimeter. (The volume of a sphere is given by 4/3 πr3.) g/cm3 (b) Find the surface area of Saturn in square meters. (The surface area of a sphere is given by 4πr2.)
Answer:
1.) 0.68 g/cm^3
2.) 4.3 × 10^16 m^2
Explanation:
Given that the radius of the planet Saturn is 5.85 ✕ 107 m, and its mass is 5.68 ✕ 1026 kg.
Where (The volume of a sphere is given by 4/3 πr3.)
Substitutes r into the parameters
V = 4/3π × ( 5.85 × 10^7)^3
V = 8.39 × 10^23 m^3
Convert cubic meters to cubic centimeters by multiplying the result by 1000000
V = 8.39 × 10^29 cm^3
The mass in gram will be
5.68 ✕ 10^26 × 1000 = 5.68 × 10^29g
Density = mass/ volume
Substitute all the parameters into the formula
Density = (5.68 × 10^29) / (8.39 × 10^29)
Density = 0.68 g/cm^3
2.) The surface area of a sphere is given by 4πr^2.
Substitute r into the formula
Surface area = 4π × (5.85 ✕ 10^7) ^2
Surface area = 4.3 × 10^16 m^2
who is the current electric minister of Nepal?
i think "Barsaman Pun"
Explanation:
BARSAMAN PUN IS THE CURRENT ELECTRIC MINISTER OF NEPAL.
HOPE IT HELP.....❤❤☺help pleaseeeee!! What is something that you would like to see a physicist develop in the future?
Teleportation (artificial or natural over wormhole).
If someone told you that they traveled 50 km east, are they describing the distance they traveled or their displacement? How do you know? *
Answer:
They are describing their displacement
Explanation:
The correct answer would be that they are describing their displacement.
Distance is a scalar quantity while displacement is a vector quantity. A scalar quantity only has magnitude without any indication of the direction while a vector quantity has both magnitude and direction.
Hence, if someone travels 50 km east, the distance they covered is only 50 km while the displacement is 50 km in the eastward direction.
A straight stream of protons passes a given point in space at a rate of 2.5 x 109 protons/s. What magnetic field do they produce 1.5 m from the beam
Answer:
B = 5.3x10⁻¹⁷ T
Explanation:
The magnetic field can be calculated as follows:
[tex]B = \frac{\mu_{0}I}{2\pi R}[/tex]
Where:
μ₀: is the magnetic permeability = 4πₓ10⁻⁷ H/m
I: is the current
R: is the distance between the magnetic field and the beam = 1.5 m
The current is:
[tex] I = 2.5 \cdot 10^{9} p/s*1.6 \cdot 10^{-19} C/p = 4.0 \cdot 10^{-10} A [/tex]
Hence, the magnetic field is:
[tex]B = \frac{\mu_{0}I}{2\pi R} = \frac{4\pi \cdot 10^{-7} H/m*4.0 \cdot 10^{-10} A}{2\pi*1.5 m} = 5.3 \cdot 10^{-17} T[/tex]
Therefore, the magnetic field is 5.3x10⁻¹⁷ T.
I hope it helps you!
The magnetic field will be "[tex]5.3\times 10^{-17} \ T[/tex]".
Magnetic field:According to the question,
Magnetic permeability, [tex]\mu_0 = 4 \pi\times 10^{-7} \ H/m[/tex]
Distance between magnetic field and beam, R = 1.5 m
The current (I) will be:
= [tex]2.5\times 10^9\times 1.6\times 10^{-19}[/tex]
= [tex]4.0\times 10^{-10} \ A[/tex]
hence,
The magnetic field (B) be:
= [tex]\frac{\mu_0 I}{2 \pi R}[/tex]
By substituting the values,
= [tex]\frac{4 \pi\times 10^{-7}\times 4.0\times 10^{-10}}{2 \pi\times 1.5}[/tex]
= [tex]5.3\times 10^{-17} \ T[/tex]
Thus the response above is appropriate.
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Two cars are travelling in the same direction on a road. The blue car is travelling at 50 m/s in front of the red car, which is travelling at 75 m/s. What is their relative speed? *
Explanation:
The speed of the red car, relative to the blue car, is:
v = 75 m/s − 50 m/s
v = 25 m/s