Answer:
v = 1/3 m / s = 0.333 m / s
in the direction of the truck
Explanation:
The average speed is defined by the variation of the position between the time spent
v = Δx / Δt
since the position is a vector we must add using vectors, we will assume that the displacement to the right is positive, the total displacement is
Δx = 20 - 15 +20
Δx = 25 m
therefore we calculate
v = 25/75
v = 1/3 m / s = 0.333 m / s
in the direction of the truck
As shown in the figure below, Justin walks from the house to his truck on a windy day. He walks 20 m toward the truck, 15 m back to retrieve his wind-blown hat, and another 20 m to reach the truck. He walked a total time of 75 s.
Answer:
What is Justin’s average velocity over the 75 s period?
Answer: 0.33 m/s
What is Justin’s average speed over the 75 s period?
Answer: 0.73 m/s
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
A soccer ball is kicked horizontally. What is its average speed if its displacement is 55.0 m after 12.00 s? What formula was used to solve this problem?
4.58 m/s
Speed = displacement / time
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
Think and discuss: Why do you think the rate of temperature change does not stay constant over time? If possible, discuss your answer with your teacher and classmates.
Because the temperature of the place its contained in is constantly changing, for example, if you put a room temperature item in the fridge it will become cold, or whatever the temperature you set your fridge to.
Variation in the factors of climate leads to variable temperature around the world.
The rate of temperature change does not stay constant over time because of changes occur in the climatic factors. The climatic factors such as latitude, elevation, nearby water, ocean currents, topography, vegetation, and prevailing winds can't remain constant which leads to variable temperature in different regions of the world.
The temperature will remain the same if all the world has same environmental conditions so we can conclude that variation in the factors of climate leads to variable temperature around the world.
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What happens to the acceleration of an object if the net force on it increases?
OA. The acceleration increases.
OB.
The acceleration decreases.
O C.
The acceleration becomes zero.
OD.
The acceleration remains the same.
Answer:
A
Explanation:
The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased
Jan ran 4 miles north in 28 minutes. What was Jan's average velocity?
Answer:
3.83 m/s
Explanation:
Given that,
Distance covered by Jan, d = 4 miles
1 mile = 1609.34 m
4 miles = 6437.38 m
Time, t = 28 minutes = 1680 s
Jan's average speed,
v = d/t
[tex]v=\dfrac{6437.38\ \text{m}}{1680\ \text{s}}\\\\v=3.83\ \text{m/s}[/tex]
Hence, the average velocity of Jan is 3.83 m/s.
How much miles is it from the surface to center of earth
The average is 3,959 miles.
it is 3,959
Explanation:
hope this helps you.
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.
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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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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A woman drives to her office 10 km away from her house at 9 am, and
reaches her office at 9:20 am. She stays in the office until 6 p.m, and
then returns home at 6:25 p.m. Which answer gives the correct
distance and displacement at 6:25 p.m.?
The displacement of the woman at 6:25 pm is zero (0) while her total distance at 6:25 pm is 20 km.
The given parameters;
distance between the woman's house and her office, d = 10 kmtime to reach her office = 20 minutestime to return to her house = 25 minutesDisplacement is defined as the change in the position of an object. It can be described as 'how far' an object is displaced from the initial position.
The first position of the woman, x₁ = 10 km to officeThe final position of the woman, x₂ = 10 km back homeThe woman's displacement = x₂ - x₁ = 10 km - 10 km = 0
Distance is the total path covered by an object during motion.
Total distance of the woman at 6:25 pm = 10 km + 10 km = 20 km
Thus, we can conclude that the displacement of the woman at 6:25 pm is zero (0) while her total distance at 6:25 pm is 20 km.
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Does the distance a person kicks a soccer ball
affect how well they will do on their math test?
Identify the independent and dependent
variable
Answer:
Independent variable: how far the soccer ball is kicked.
Dependent variable: how well the person does on their math test
Explanation:
The distance the ball is kicked is what the scientist can change. On the other hand, in this experiment, how well the person does on their test supposedly relies on how far the soccer ball is kicked.
List one benefit and one limitation of using scientific models.
Answer:
the benefit is that they can see and experiment on the model but some times the model isn't accurate resulting in immediate failure
im only 13 sorry if this is wrong i tried.
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:
The simplest form of a substance
is called:
A a period
B a property
Can atom
D an atomic number
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
Help me pleaseee!!!!!
Picture too blurry. Please add a clearer image of it.
what is the speed of a car that travels a distance of 200m in 2.3 seconds ?
Answer:
460metre per second
Explanation:
Speed = Distance x Time.
Given a graph of volocity v . Time what does a horizontal line represent
Answer:
Acceleration
Explanation:
For example, if the acceleration is zero, then the velocity-time graph is a horizontal line (i.e., the slope is zero). If the acceleration is positive, then the line is an upward sloping line (i.e., the slope is positive).
Do geochemists need to have a knowledge of physical science? Explain your
answer. please help:))
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
distance travelled by a train is 495 km in 4 hours 30 minutes, what is its speed in m/s?
Answer:
9.09m/s
Explanation:
Speed = Distance/Time
Distance = 495km
Time = 4 hr 30 min = 4 hr 1/2hr = 4.5 hr
Therefore, Speed = 495/4.5 = 110km/h
Now to convert km/h to m/s
110 x 1000/ 110 x 110
110 cancels out each other, we are now left with
1000/110 = 9.09m/s
In a study, the data you collect is Habits on a Always/Sometimes/Never scale.What is the level of measurement?
Answer:
Ordinal
Explanation:
There are four levels of measurement which include the nominal, ordinal, interval, and ratio. The data collected above is ordinal data as it qualifies the data and still indicates the ordering of the data. It gives the observer an idea of the range of data collected or its rating although mathematical calculations may not be done with it.
The other forms of data include the nominal which simply qualifies the data, the interval which qualifies the data but which the differences between the data can be obtained, and of course the data has no starting point. The ratio scale which is similar to the interval scale but which the ratios between the data obtained can be compared.
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
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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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
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.
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?
PLEASE HELP*******
use the table to find the acceleration of the object for the time interval 1.0 to 4.0 seconds
Answer:
acceleration for time interval from 1 sec to 4 second is 1.5 metre/second^2
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