Explanation:
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Explanation:
a variable (often denoted by x ) whose variation does not depend on that of another.
If a boat goes from 30 km/h to 50 km/h over the next 4 h, what is its acceleration? 30-50/4
Acceleration = (change in speed) divided by (time for the change)
Change in speed = (50 km/h)-(30 km/h)
Change in speed = 20 km/h
Acceleration = (20 km/h) / (4 h)
Acceleration = 5 km per hour-squared
Using the proper physics vocabulary tell me how do you get a constant speed
Answer:
Formula for constant-speed = Total distance / Total time taken
Explanation:
3. A body has an initial velocity of 4.0m/s. After 6.0s, the velocity is 12.0m/s. Determine the displacement of the body in the 6.0s. (Δs = 0.5(u + v)t
A car with a mass of 1,200 kg travels a distance of 150 m as it moves from
one stoplight to the next. At its fastest, the car travels at 22 m/s. What is its
kinetic energy at this point?
A. 290,400
B. 8,872 J
C. 580,800 J
D. 13,200 J
Answer:
A. 290,400
Explanation:
The kinetic energy of a car is 290,400J.
How to find Kinetic energy?Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2.
ke = 1/2mv^2
By using the formula, we get
= 1/2 * 1200 * 22^2
= 600 * 484
= 290,400 J
Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
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Free fall kinematics
Percy threw a penny straight down off the Empire State building. The building is 354 m tall. If he threw the penny down such that it left his hand at 35 m/s, what is the acceleration of the penny? What will the velocity of the coin that Percy threw be when it hits the pavement?
Answer:
90.4 m/s
Explanation:
Take down to be positive. For objects in free fall, the acceleration is 9.8 m/s².
Given:
Δy = 354 m
v₀ = 35 m/s
a = 9.8 m/s²
Find:
v² = v₀² + 2aΔy
v² = (35 m/s)² + 2 (9.8 m/s²) (354 m)
v = 90.4 m/s
A student lefts a bouncy ball to 1.2m, then releases the ball. The ball bounces back up to 0.86m. Construct an explanation as to what happened to the energy.
Answer:
the decrease in energy is due to a transformational in internal energy of the body in the rebound.
Explanation:
For this exercise we can calculate the initial and final mechanical energy
Em₀ = U = m g y₁
[tex]Em_{f}[/tex] = U = m g y₂
we look for the variation of the energy
ΔEm = Em_{f} - Em₀
ΔEm = m g (y_{f} -y₀)
ΔEm = m g (0.86 -1.2)
ΔEm = -3.332 m
We can see that there is a decrease in mechanical energy, this is transformed into internal energy of the ball during the impact with the ground, this energy can be formed by several factors such as a part of the friction with the surface, an increase in body temperature or a deformation of the body; there may be a contribution from several of these factors.
In conclusion the decrease in energy is due to a transformational in internal energy of the body in the rebound.
Answer:
Please find the answer in the explanation
Explanation:
Given that a student lefts a bouncy ball to 1.2m, then releases the ball. The ball bounces back up to 0.86m. To Construct an explanation as to what happened to the energy, let first consider the difference in the two height of the ball.
The initial height = 1.2 metres
Final height = 0.86 metres
There is a loss in elastic potential energy of the ball. And the loss energy is due to the difference in the height of the ball under the gravity.
The loss in elastic potential energy is being converted to the gravitational potential energy.
The 500 pages of a book have a mass of 2.50 kg. What is the mass of each page A in kg B in mg?
Answer:
A.
Mass per page = mass of book / number of pages
Mass per page = 2.5kg / 500 pages = 0.005kg
B.
Mass per page = mass of book / number of pages
Total mass = 2.5kg = 2,500grams = 2,500,000mili grams
Mass per page = 2500000mg / 500 pages = 5000mg
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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Why do we insulate houses?
A. To prevent heat transfer from inside to
the outside
B. To allow energy to flow from inside to
the outside
C. To keep them cool in the winter and
warm in the summer
w many significant figures does the following number have: 100.00210
Answer:
Number of Significant Figures: 8
The Significant Figures are 1 0 0 0 0 2 1 0
Explanation:
We have that 100.00210 has a 8 significant figure from the rules of Significant figures
8 significant figure
From the question we are told
How many significant figures does the following number have: 100.00210
Generally
Non zeros Number are significant
Zeros that are before a none zero a not significant
Therefore
100.00210 has a 8 significant figure from the rules of Significant figures
8 significant figure
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Which of the following examples describe an acceleration? (Check ALL that APPLY)
Group of answer choices
A car has to slow down as it approaches a slower truck in front of it
A car is sitting in a parking lot
A car maintains a speed of 15 mph as it turns around a corner
A car is stopped at a stop light, and speeds up when it turns green
A car drives straight down a road at 60 mph
Answer:#3,#4,#5
Explanation:they each don't stop
Which part of an amino acid's basic structure gives it its unique functional characteristics? Choose 1 answer: А R-group B Central alpha (a) carbon Carboxyl group (-COOH) Amino group (-NH2)
Answer:
A. R- group
Explanation:
The part of an amino acid's basic structure gives it its unique functional characteristics is R-group.
What is amino acids?Amino acids are smaller molecules that join or combine together through peptide bond to form protein. They are refer to the building block of protein.
Therefore, The part of an amino acid's basic structure gives it its unique functional characteristics is R-group.
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Which of the following are states of matter?
A. Gas
B. Compound
€. Mixture
D. Solid
E. Liquid
Answer:
Solid , liquid and gas
Explanation:
However, mixture and compound are other things.
what is the density of 15kg block of wood wuth a volume of 1.5 cubic meters
10. John has borrowed his parents car without permission and is driving without a license. He
sees them out walking and realizes that they will be home in about 45 seconds. He is 500 m
from home and driving 25 m/s. Will he get to the driveway before they do?
The area of a triangle is 30 m². Using the equation A=12bh A = 1 2 b h , where b is base and h is height, solve for h if b = 3 m. Round to three decimal places, if necessary.
Answer:
20 metres
Explanation:
Given that the area of a triangle is 30 square metres (m²). Using the equation A = 1/2bh, this is the formula for the triangle.
where b is base and h is height
Given that b = 3 metres.
To calculate h, Substitute b and A into the equation
30 = 1/2 × 3 × h
3h = 60
h = 60/3
h = 20 m
Therefore, h is equal to 20 metres
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.
what weights include barbells and dumbbells
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
In this section please include the if then statements you develop during your lab activity these statement reflect your predicted outcomes for the experience
Answer:
but for which activity donu need the answer and mention the question clearly
Calculate the volume of this regular solid. A cone 4.5 centimeters high with a radius of 3 centimeters. Label B is pointing to the circular base of the cone.
Answer:42.41
Explanation:
What aspect of motion can you conclude is common among freely falling objects ?
Answer:
Free-fall is defined as the movement where the only force acting on an object is the gravitational force.
By the second Newton's law, we have that:
F = m*a
Where F = Force, m = mass, a = acceleration.
We can write this as:
a = F/m
And the gravitational force can be written as:
F = (G*M/r^2)*m
Where G is the gravitational constant, M is the mass of the Earth in this case, and r is the distance between both objects (the center of the Earth and the free-falling object)
As the radius of the Earth is really big, the term inside the parentheses is almost constant in the region of interest, then we can write:
G*M/r^2 ≈ g
And the gravitational force is:
F = g*m
And by the second Newton's law we had:
a = F/m = (g*m)/m = g
a = g
Then the acceleration does not depend on the mass of the object.
Then the thing that is common among the free-falling objects is the vertical acceleration.
A country is experiencing economic problems. Many people are unemployed,
and businesses have been making risky investments. The government
decides to start more programs to help poor citizens find jobs, and to regulate
corporate behavior.
This situation best reflects the influence of which economic thinker?
This situation best reflects the influence of which economic thinker is John Maynard Keynes
The following information should be considered:
Keynes's theory was increased in the government expenditures and lower the taxes that stimulated demand.Also, it should pull the economy out of a depression.Learn more: https://brainly.com/question/5763151?referrer=searchResults
Why is the pressure so high deep inside the outer planets?
Answer:
they a giant ball of gases, so the answer is they have very large gas masses
Explanation:
Answer:
get G OA S S E d
Explanation:
d gasses are large
Why do we use percent deviation rather than simply expressing the size of the error itself?
Answer:
the percentage we have the fraction between the error and the magnitude,
Explanation:
When absolute error is used, it is a value that remains constant regardless of the magnitude of the measurement, for large measurements it can represent great accuracy, but for small measurements the accuracy may be low, for example> if we use a tape measure with error of Dx = 0.1 cm if the measurement is 1 meter this error is acceptable, but if the measurement is 1 cm the error is too big.
When we use the percentage we have the fraction between the error and the magnitude, so if this relationship is small the measure is very tight and but if the relationship is high the measure has little pressure, for example
Δx = 1 cm = 0.01 m
% = 0.01 / 1 100 = 1%
% = 0.01 / 0.01 100 = 100%
therefore the precision of the measurement is known the percentage error
A car accelerates at 3 m/s*2. Assuming the car starts from rest, how much time does it need to
accelerate to a speed of 12 m/s?
3 sec
2 sec
4 sec
12 sec
None of the other answers
Acceleration,a = 3 m/s²
Initial velocity,u = 0 m/s
Final velocity,v = 12 m/s
To be calculated:-Calculate the time take by a car.
Solution:-According to the first equation of motion:
v = u + at
★ Substituting the values in the above formula,we get:
⇒ 12 = 0 + 3 × t
⇒ 12 = 3t
⇒ 3t = 12
⇒ t = 12/3
⇒ t = 4 sec
We are given with some parameters used in Kinematics for determining the motion of an object.
Accleration = 3 m/s²Started from rest (Initial vel.) = 0 m/sFinal velocity = 12 m/sWe have to find the time taken by the car to attain the final velocity with the given accleration. By using 1st equation of motion which says:
v = u + atFinal velocity = Initial velocity + Accl. × Time taken
Plugging the values,
➝ 12 = 0 + 3(t)
➝ 3t = 12
➝ t = 4 s
So, the correct answer is Option C. And we are done...
Carry On Learning [tex]![/tex]
hey can anyone help me out in dis pls!
Answer:
A is true ,b is true
Explanation:
Can a platform be in equilibrium if the two upward forces are equal to each other?
Answer:
Equilibrium is a state of consistency. An object under the influence of just one force cannot be equal. Only when there is no force at all, or when two or more forces meet zero, can the object have equilibrium.
Explanation:
A boy standing on the bridge kicks a stone into the water below. He kicks the stone with a horizontal velocity of 6.59 m/s. It lands in the water 10.92 m away from the bridge. How high is the bridge?
The stone travels a horizontal distance of
x = (6.59 m/s) * t
after time t. For the stone to have covered 10.92 m, it would have traveled for
10.92 m = (6.59 m/s) * t
t = (10.92 m) / (6.59 m/s)
t ≈ 1.66 s
The stone's altitude at time t is
y = h - g/2 * t²
where g = 9.80 m/s² is the acceleration due to gravity, and h is the height of the bridge. The stone reaches the ground after about 1.66 s, so at that point y = 0 and we solve for h :
0 = h - 1/2 * (9.80 m/s²) * (1.66 s)²
h = 1/2 * (9.80 m/s²) * (1.66 s)²
h ≈ 13.5 m
An airplane accelerates down a runway at 3.10m/s^2 for 41.5 seconds from rest until it finally lifts off the ground . What is the displacement before take off
Answer:1720m
Explanation:
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