Answer:
With the given information, we can assume that the start and the end of the trip are the same place. (Suppose, a tour where the bus starts at the school, then it goes to a given location, and then it returns to the school)
Now, the definition of displacement is:
The difference between the final position and the initial position.
But if the start and the end of the trip are the same place, then the initial and final position must be the same. Then the difference between the final position and the initial position is zero.
This means that the displacement of the school bus from the start to the end of its trip must be zero.
when wave enter a new region of high density the reflected wave ?
a- chnage phase by 180 degree
b- doesn't change phase bu 180 degree
ured length. Measurement errors are another type of uncertainty involved in single measurements. Suppose we measure the diameter of a disk. The minimum length that can be measured on the stick is 1 mm (0.1 cm). If the diameter lies somewhere between 5.1 cm and 5.2 cm, which value do we report? In such cases the value is reported as 5.15 ± 0.05 cm. Note that the uncertainty of the measurement is one half the smallest tick mark on the measuring device. This applies to all instruments. A sound experimental procedure involves several measurements of the physical quantities required in one of several ways. Once those measurements have been made, we compute the statistical quantities listed in the key concepts above to make inferences from the data obtained. Question 1 (write down answers on Report Sheets) Below are three sets of measurements of the boiling point of water at 1 standard atmosphere (atm): Measurement 1 2 3 4 5 Set A 99.8 °C 99.8 °C 99.8 °C 99.8 °C 99.8 °C Set B 100.0
Answer:
T = (99.78 ±0.05) ºC
Explanation:
This problem refers to the procedure to perform the measurements and their correct reporting.
Suppose that the thermometer used has an appreciation of 0.1ºC and the values of 5 measurements resulted in
# T (ºC)
1 99.8
2 99.7
3 99.7
4 99.8
5 99.9
the processing calculate mean value
T_average = ∑ [tex]T_{i}[/tex] / n
T_average = (99.8 + 99.7 + 99.7 + 99.8 + 99.9) / 5
T_average = 99.78ºC
the absolute error or uncertainty of the measurement is half the appreciation of the instrument
ΔT = ± 0.05ºC
so the result must be written
T = (99.78 ±0.05) ºC
A 5,000 kg truck moving at 8 m/s has the same momentum as a 2,500 kg car. What is the velocity of the car?
Answer:
16 m/s.
Explanation:
The following data were obtained from the question:
Mass of truck = 5000 Kg
Velocity of truck = 8 m/s
Mass of car = 2500 kg
Velocity of car =..?
Next, we shall determine the momentum of the truck. This can be obtained as follow:
Mass of truck = 5000 Kg
Velocity of truck = 8 m/s
Momentum of truck =.?
Momentum = mass × velocity
Momentum = 5000 × 8
Momentum of the truck = 40000 Kg.m/s
Finally, we shall determine the velocity of the car as follow:
From the question given above, we were told that the car and truck has the same momentum.
This implies that:
Momentum of the truck = momentum of car = 40000 Kg.m/s
Thus, the velocity of the car can be obtained as shown below:
Mass of car = 2500 kg
Momentum of the car = 40000 Kg.m/s
Velocity of car =..?
Momentum = mass × velocity
40000 = 2500 × velocity
Divide both side by 2500
Velocity = 40000/2500
Velocity = 16 m/s
Therefore, the velocity of the car is 16 m/s.
1. What is the current in a 160V circuit if the resistance is 20?
2. What is the current in a 160V circuit if the resistance is 10?
Answer:
8 amps 16 ampsExplanation:
ohm's law is V=I•Rto get current you need to rewrite the equation to I=V/Rso for problem one it is 160V/20ohms which equals 8ampsfor problem two it is 160V/10ohms which equals 16ampsa good way to remember ohms law is this
V
I | R
what is cell function
Answer:
Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
Explanation:
A motorbike accelerates with a force of 15000N. It experiences air resistance which acts in the opposite direction with a magnitude of 1200N. Calculate the unbalanced force that is acting on the motorbike.
Answer:
13800N
Explanation:
15000N is the force of motorbike
1200N is air resistance in opposite direction
15000N-1200N=13800N
Answer:
Ft = 13800 [N]
Explanation:
We have to carry out a force analysis and assume the directions of those forces. First the force that causes the movement of the rider is equal to 15000 [N] and is directed to the right. Since the resistance of the air is opposite to the movement, it generates a resistance with a value of 1200 [N], with direction to the left. However, the rider continues to move to the right, as the force generated by the bike is greater, i.e. this force must be to the right for movement to exist. By means of a summation of forces on the X axis we can calculate the value of the resulting force. The forces to the right will be taken with a positive sign and the forces to the left with a negative sign.
15000 - 1200 = Ft
where:
Ft = unbalanced force [N]
Ft = 13800 [N]
A robin is flying around and its velocity vvv as a function of time ttt is given in the graph below where rightwards is the positive velocity direction. What is the robin's displacement \Delta xΔxdelta, x from t=0\,\text st=0st, equals, 0, start text, s, end text to 1.5\,\text s1.5s1, point, 5, start text, s, end text?
Answer:
-0.75
Explanation:
Khan Academy gives answer here.
Which percentage of American adults do not exercise on a regular basis?
A. 40%
B. 50%
C. 55%
D. 60%
bloot the host answer from the choices provided.
What is correct answer
60 percent
Explanation:
because 20 do exercise but more that 60 don't so your answer would be 60 percent
Some researchers are developing a new fertilizer designed to improve the growth of plants in hot, dry climates. The fertilizer was applied to one hundred desert plants in a greenhouse. The average daytime temperature in the greenhouse was 90°F, and the humidity levels were low. Which is best for the researchers to do next?
Answer:
See the answer below
Explanation:
A compare plants that received fertilizer to similar plants that received none
B begin selling the fertilizer to gardeners living in hot, dry climates
C change the conditions in the greenhouse and retest the fertilizer
D test the fertilizer on plants that are adapted to cooler climates
The best thing to do next for the researcher would be to compare plants that received fertilizer to similar plants that did not receive the fertilizer in order to be able to arrive at an inference of whether the fertilizer is effective or not.
Without comparison, the researchers cannot attribute whatever they observe in the plants to just the effects of the fertilizer. There should be a control group of plants that would be subjected to the same conditions except for the addition of the fertilizer. Whatever differences that are observed in the growth of the two plant groups can then be effectively attributed to the fertilizer.
The correct option is A.
the mass of a car is 1000 kg. how much force would be required to accelerate the car at a rate of 3 m/s^2
Answer:
The answer is 3000 NExplanation:
The force acting on an object given the mass and acceleration we use the formula
force = mass × accelerationFrom the question
mass = 1000 kg
acceleration = 3 m/s²
So we have
force = 1000 × 3
We have the final answer as
3000 NHope this helps you
Usain Bolt accelerates at a rate of 3.7
m/s2 and his top speed is 12.7 m/s. How
long does it take for him to run the 100m
dash based on these numbers
Answer:
Explanation:
I think that you to run more than 12 miles
What is extensive physical property of matter
PLEASE PLEASE HELP ME
Answer:
your mom
Explanation:
An extensive property is a physical quantity whose value is proportional to the size of the system it describes, or to the quantity of matter in the system. For example, the mass of a sample is an extensive quantity; it depends on the amount of substance.
sorry for the your mom joke but I had to do it
what would happen to a solar system if gravity suddenly stopped working ?
Answer:
Explanation:
heres ya awnser pal Without gravity, everything on the surface of the Earth will start floating off. ... After all it's being held down only by gravity. On Earth or any planet with water, the seas and oceans will start floating off into space as well, complete with some very confused sea life. (Only corals and anemone would hang around).Mar 14, 2016
Answer:
WHAT THE OTHER GUY SAID
Explanation:
how much gravitational potential energy does a 5 kg rock have if is sitting on the edge of a cliff that is 10m high
Answer:
500.................Physics question I have a test Friday
Answer:c
Explanation:
1. Uma lâmpada incandescente de 60 W é usada para iluminar um corredor de uma loja. Nos dias em que a loja está aberta, essa lâmpada permanece acesa por 10 horas. Sabendo que a loja abre 6 dias na semana, e que a taxa paga pela energia elétrica é de R$0,75 por kWh, calcule o gasto com energia elétrica, por semana, dessa lâmpada.
Answer:
The cost of electric energy, per week, is $3.15
Explanation:
Given that,
Power = 60 W
Time = 10 hours
Cost of electric energy = $ 0.75
We need to calculate the energy
Using formula of energy
[tex]E=Pt[/tex]
Where, P = power
t = times
Put the value into the formula
[tex]E=60\times10[/tex]
[tex]E=600\ Wh[/tex]
[tex]E=0.6\ kw h[/tex]
We need to calculate the energy consume in a week
Using formula of energy
[tex]E'=0.6\times7[/tex]
[tex]E'=4.2\ kwh[/tex]
We need to calculate the cost of electric energy, per week,
Using energy for cost
[tex]Cost\ of\ 1\ kWh=\$0.75[/tex]
[tex]Cost\ of\ 4,2\ kwh=4.2\times0.75[/tex]
[tex]Cost\ of\ electric\ energy=$ 3.15[/tex]
Hence, The cost of electric energy, per week, is $3.15
1. If I travel 50 miles in 5minutes, how fast am I going?
Answer:
10 miles a min
Explanation:
math
calculate the resistance of a 1 m long wire of diameter 0.3mm
A cannon shoots a cannonball from ground level at an angle of 60 degrees from the ground with a total velocity of 25 m/s. solve for the time it takes for the ball to hit the ground.
Which of the following is an example of Newton’s 1 st Law? a. Using a force to push a box b. Pulling back an arrow to shoot it forward c. A table remains motionless in a classroom d. None of the above
Answer:
C.
Explanation:
Newton's 1st law states that an object at rest will stay at rest until acted upon by an external force.
Answer:
C is the answer for the question
The heat transfer depicted in the image is MOST likely
A) circulation.
B) conduction.
Eliminate
C) convection.
D) radiation.
first to answer correctly get brainlilest
Answer:
Convection
Explanation:
Which is required for convection to occur?
a solid substance
a heat source
boiling water
air molecules
The most important factor for convection to occur is heat.
What is heat transfer by convection?
Convection is a method of heat transfer that involves the movement of fluid from hot region to cold region.
Heat transfer processes by convection is dominant in liquids and gases.
Therefore, we can conclude that the most important factor for convection to occur is heat, because the heat must flow from hot region to cold region through fluid movement.
Learn more about convection heat transfer here: https://brainly.com/question/893656
Answer:
B
Explanation:
a heat source
The BMW has an 85L tank while the Cadillac has a 25 gallon tank. Which one has the larger tank?
85 Liters would be around 19 to 20 gallons so it's most likely the Cadillac
If The BMW has an 85 L tank while the Cadillac has a 25-gallon tank then the Cadillac would have a larger tank because its 25-gallon tank would be equivalent to 94.635 liters.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
As given in the problem, the BMW has an 85L tank while the Cadillac has a 25-gallon tank,
1 gallon = 3.7854 liter
25 gallons = 25× 3.7854
= 94.635 liters
If the Cadillac had a 25-gallon tank compared to the BMW's 85-liter tank, the Cadillac would have a larger tank since 25-gallon tanks are equivalent to 94.635 liters.
Learn more about density from here,
brainly.com/question/15164682
#SPJ2
Please help me !! i am tired i worked all day to bring my grade up whitch i did i just gotta do this last assiment I will give brainlsit when i wake up
Plutonium= Pu, 94, 244,94,94
Chromium= Cr, 24,52, 24,24
Neon = Ne, 10,20,10,10
Gold= Au, 79,197,79,79
Radon = Ra ,86,222,86,86
if you have a density of 15 g/mL and a mass of 5 g what is the volume in decimal form
Answer:
The answer is 0.33 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 5 g
density = 15 g/ml
We have
[tex]volume = \frac{5}{15} = \frac{1}{3} \\ = 0.333333[/tex]
We have the final answer as
0.33 mLHope this helps you
The speed of an object changes only when it is acted on by an unbalanced force.
True
False
The atomic number of cobalt is 27 and its mass number is 58.93. How many protons and neutrons does an atom of cobalt have?
Answer:
27 protons, and 32 neutrons.
The atomic number of cobalt is 27 and its mass number is 58.93. Number of protons and neutrons does an atom of cobalt have 27 protons, and 32 neutrons.
What is mass?
In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force. The change caused by an applied force is smaller the more mass a body has.
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom.
rest mass of one proton 1.67262 × 10−27 kg
rest mass of one neutron 1.674*10-27 kg.
The atomic number of cobalt is 27 and its mass number is 58.93. Number of protons and neutrons does an atom of cobalt have 27 protons, and 32 neutrons.
To learn more about mass refer to the link:
brainly.com/question/19694949
#SPJ6
In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge. This resulted in a large movement of roadway, which eventually caused the bridge to fail. What characteristic of waves caused the bridge to collapse? Absorption, because the bridge absorbed all the energy of the wind diffraction, because the wind moved around the bridge, which set the bridge into motion interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge interference, because destructive interference occurred when the wind frequency matched the natural frequency of the bridge
Answer:
interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge
Explanation:
Wave interference occurs when two waves with identical wavelength, velocity, frequency, and amplitude meet each other when the waves travel along with the same medium.
The characteristic of waves that caused the bridge to collapse is interference because constructive interference occurred when the wind frequency matched the natural frequency of the bridge
Answer:
C im pretty sure
Explanation:
Planet Earth belongs in a spiral-shaped galaxy known as the Milky Way. True False
how the kinetic is transformed into potential energy in the Newton's Cradle example
Answer:
for example,lets say we lift the ball on one end up a certain height and then release it when the ball falls and strikes the next ball beside it,it transfer its kenitic energy to it.
Answer:
See the explanation below
Explanation:
The principle of Energy Conservation tells us that energy is transformed from kinetics to potential and vice versa. That is, the potential energy is transformed from potential to Kinetics as the height of the body decreases with respect to a reference level (level where the potential energy is zero), but as the potential energy decreases the kinetic energy increases, this increase is represented by the increase in speed. At the moment that the potential energy is zero, the kinetic energy is maximum i.e. the body experiences maximum velocity. And when the kinetic energy is minimal or zero, it tells us that all the kinetic energy has been transformed into potential.