Answer:
a. The average speed is 4 mi/hr
b. The average velocity is 0 mi/hr
Explanation:
a. The average speed is given by the following formula;
[tex]Average \ speed = \dfrac{Total \ Distance}{Total \ Time}[/tex]
The given information are;
The time it took for one friend to run to his friend's house = 30 minutes
The distance between the two houses = 3 miles
The time it took for the friend to walk home = 1 hour
Therefore, the distance the friend ran going to his friend's house = 3 miles and the distance the friend walked going back his house = 3 miles
The total distance travelled = 3 + 3 = 6 miles
The total time taken = 1 hour + 30 minutes = 1 hour 30 minutes = 1.5 hours
Therefore;
[tex]The \ average \ speed = \dfrac{Total \ Distance}{Total \ Time} = \dfrac{6 \ miles }{1.5 \ Hours} = 4 \ miles \ per \ hour[/tex]
The average speed for the entire trip = 4 mi/hr
b. The average velocity is the total change in position divided by the total time taken to make the change or total displacement divided by the total time for the displacement
Mathematically, average velocity is given as follows;
[tex]The \ average \ velocity = \dfrac{Final \ location - Initial \ location}{Time \ taken \ for \ the \ change \ in \ location}[/tex]
[tex]The \ average \ velocity = \dfrac{Total \ displacement}{Time \ taken \ for \ the \ change \ in \ location}[/tex]
[tex]The \ average \ velocity = \dfrac{Total \ change \ in \ location}{Time \ taken \ for \ the \ change \ in \ location}[/tex]
Given that the friend changed his location to his friend's house, a distance of 3 miles he we have;
Initial change in location of the friend = 3 miles
After which the friend then relocates back to his house (and we know that it is the same journey but in opposite direction, he we have;
Final change in location of the friend = -3 miles
We are given that he ran to his friend's house and walked back home in a total time of 1 hour + 30 minutes = 1.5 hours, therefore, we have;
[tex]The \ average \ velocity = \dfrac{Sum \ total \ of \ change \ in \ location}{Time \ taken \ for \ the \ change \ in \ location} = \dfrac{3 + (-3) }{1.5}[/tex]
[tex]The \ average \ velocity = \dfrac{3 \ miles + (-3) \ miles }{1.5} = \dfrac{0 \ miles }{1.5} = 0 \ mi/hr[/tex]
The average velocity = 0 mi/hr.
what kind of material is associated with new technology
Answer:
Silicon was touted as the revolutionary material that can do wonders in the tech industry.
Explanation:
give two examples of vernier calliper
Answer:
Example 1, if a vernier caliper output a measurement reading of 2.13 cm, this means that: The main scale contributes the main number(s) and one decimal place to the reading
E.g. 2. 1 cm, whereby 2 is the main number and 0.1 is the one decimal place number
Explanation:
plz mark as brainliest and hope it helps you
How is a vector represented in symbol form?
Calculating density help me illl give brainliest
Answer:
1. 0.2 g/cm³.
2. 1 g/cm³.
3. 0.72 g.
Explanation:
1. Determination of the density of the bread.
Volume (V) = 2270 cm³
Mass (m) = 454 g
Density (D) =?
The density of a substance is simply defined as the mass of the substance per unit volume of the substance. It is represented mathematically as:
Density (D) = mass (m) /volume (V)
D = m/V
With the above formula, we can calculate the density of the bread as follow:
Volume (V) = 2270 cm³
Mass (m) = 454 g
Density (D) =?
D = m/V
D = 454/2270
D = 0.2 g/cm³
Therefore, the density of the bread is 0.2 g/cm³.
2. Determination of the density of water.
Volume (V) = 1 L
Mass (m) = 1000 g
Density (D) =?
Next, we shall convert 1 L to cm³. This can be obtained as shown below:
1 L = 1000 mL
1 mL = 1 cm³
1000 mL = 1000 cm³
Therefore,
1 L = 1000 mL = 1000 cm³
Therefore, 1 L is equivalent to 1000 cm³.
Finally, we shall determine the density of water as follow:
Volume (V) = 1000 cm³
Mass (m) = 1000 g
Density (D) =?
D = m/V
D = 1000 / 1000
D = 1 g/cm³
Therefore, the density of water is 1 g/cm³.
3. Determination of the mass of the block of wood.
Density (D) = 0.6 g/cm³
Volume (V) = 1.2 cm³
Mass (m) =...?
D = m/V
0.6 = m/1.2
Cross multiply
m = 0.6 × 1.2
m = 0.72 g
Therefore, the mass of the block of wood is 0.72 g.
Given no air resistance, all objects near the Earth's surface – regardless of
size and weight – fall with the same acceleration because of gravity.
True or False ?
Answer:
True
Explanation:
If a car travels 400m in 20 seconds how fast is it going? 20 m/s
Answer:
20m/s
Explanation:
Speed = distance / time
Speed = 400/20
Speed = 20
Two students make a model of a tree House they want to build. the scale 1:42 in the scale model the treehouse door is 3 cm tall how tall should the real treehouse store be
A 36cm
B 126cm
C 14cm
D 45cm
Answer:
Option B. 126 cm.
Explanation:
From the question given above,
The scale = 1 : 42.
Height of the real door =...?
The scale for the tree house project is
1 : 42. This implies that for every 1 cm on paper, it represents 42 cm on land.
Now, if the height of the door on paper is 3 cm, then the height of the door on land = 3 × 42 = 126 cm on land.
Therefore, the real tree house door is 126 cm tall.
What is 645 g to kg?
Answer:
0.645 kg
Explanation:
because 1 kg = 1000 g
so 1 g = 1/1000 kg = 0.001 kg
645 g = (645 x 0.001) kg = 0.645 kg
What is the main unit of measurement used in football?
Answer: It would be yards
Explanation:
Answer:
I suppose you are talking about American football, so the answer would be yards.
Explanation:
The field is measured using yards.
A car slows down from a velocity of 25 m/s to rest in 5.0 seconds. How far did the car travel during that time?
Answer:
[tex] \boxed{\sf Distance \ travelled = 62.5 \ m} [/tex]
Given:
Initial velocity (u) = 25 m/s
Final velocity (v) = 0 m/s (Rest)
Time taken (t) = 5 seconds
To Find:
Distance travelled by car (s)
Explanation:
From equation of motion of object moving with uniform acceleration in straight line we have:
[tex] \boxed{ \bold{s = (\frac{v + u}{2} )t}}[/tex]
By substituting value of v, u & t in the equation we get:
[tex] \sf \implies s = ( \frac{0 + 25}{2} ) \times 5 \\ \\ \sf \implies s = \frac{25}{2} \times 5 \\ \\ \sf \implies s = 12.5 \times 5 \\ \\ \sf \implies s = 62.5 \: m[/tex]
[tex] \therefore[/tex]
Distance travelled by car (s) = 62.5 m
The distance car travel during that time is 62.5 meter.
What is acceleration?
Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.
Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.
Initial velocity (u) = 25 m/s
As the car becomes rest, final velocity (v) = 0 m/s (Rest)
Time taken (t) = 5 seconds.
The deceleration of the car: a = (initial speed - final speed)/time interval
= ( 25 m/s - 0 m/s)/5 second
= 5 m/s²
The distance car travel during that time = ut - at²/2
= 25 × 5.0 meter - (5×5²/2) meter
= 62.5 meter.
Hence, the distance car travel during that time is 62.5 meter.
Learn more about acceleration here:
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The largest formal unit of geologic time is ______.
Answer:
[tex] \boxed{ \bold{ \huge{ \boxed{ \sf{eon}}}}}[/tex]
Explanation:
The largest formal unit of geologic time is eon .
Hope I helped!
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In addition to how much force Earth exerts on the object, which features of an object affect its weight?
mass and location of the object shape and location of the object location of the object and how much energy the object has mass of the object and how much energy the object has
Answer:
I am pretty sure the answer is A
Explanation:
I know its not C
I hope this helps and I'm sorry if it does not.
The features of an object which affect its weight are the mass and location which is denoted as option A.
What is Weight?This is defined as the force acting on the object due to gravity and the formula is W = mg where m is mass and g is acceleration due to gravity.
This is why the weight features of an object is affected by its mass and then location.
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Write 3,800 seconds in hours, minutes, and seconds
Explanation:
3,800 seconds in hours is 1.055556
3,800 seconds in minutes is 63.33333
3,000 seconds in seconds is the same.
what is a synonym for motion
Answer:
there are a lot so imma just say a few movement,moving,shifting,to and from
Explanation:
Hope this helps
What is the acceleration if a car slows down from 30 m/s to 15 m/s in 4 seconds?
Answer:
11.25
Explanation:
acceleration =v-u/t
=-30-15/4
=-45/4
=11.25
hope it helps
Answer:
[tex] \boxed{\sf Acceleration \ (a) = -3.75 \ m/s^2} [/tex]
Given:
Initial velocity (u) = 30 m/s
Final velocity (v) = 15 m/s
Time taken (t) = 4 seconds
To Find:
Acceleration (a) of the car
Explanation:
From equation of motion we have:
[tex] \boxed{ \bold{v = u + at}}[/tex]
By substituting value of v, u & t in the equation we get:
[tex] \sf \implies 15 = 30 + 4a \\ \\ \sf \implies 4a + 30 = 15 \\ \\ \sf \implies 4a = 15 - 30 \\ \\ \sf \implies 4a = - 15 \\ \\ \sf \implies a = - \frac{15}{4} \\ \\ \sf \implies a = - 3.75 \: m {s}^{ - 2} [/tex]
[tex] \therefore[/tex]
Acceleration (a) of the car = -3.75 m/s²
How can Climate Change impact the formation of Hurricanes?
A hurricane is just like any other low-pressure system.
But it gets bigger, and stronger, and picks up a lot of rain, by passing over warm, tropical ocean water.
If anything like climate change or hot fish were to come along and make that water warmer, then there would be more energy for the low pressure system to absorb from the warmer water. Then it would get even bigger and stronger, and it would pick up even more rain on its way over.
Also, normal-size low-pressure systems over the ocean that could never become tropical storms or hurricanes before, COULD do it now that the ocean is warmer. (Notice how this year, 2020, there have been so many hurricanes and tropical storms that NOAA ran out of names for them, and had to start using Greek letters. This has only happened once before.)
h e l p a h o m i e o u t t h a n k s
A soccer ball is kicked straight up in the air with an initial velocity of 17 m/s and rises to a height
of 14.7 m before beginning to fall back down. How long (in total) is the soccer ball in the air?
Answer:
3.4 s
Explanation:
Given:
Δy = 0 m
v₀ = 17 m/s
a = -10 m/s²
Find: t
Δy = v₀ t + ½ at²
0 m = (17 m/s) t + ½ (-10 m/s²) t²
0 = 17 m/s − (5 m/s²) t
t = 3.4 s
a car left skid marks 78 m long on a road as it slid to a stop. If the car’s acceleration was -3.9 m/s, why was its velocity before it began to skid
Answer:
-0.05
Explanation:
-3.9/-3.9= o and -3.9/78= -0.05
Need help with number 1
How much force is generated when a 200 kg block is accelerated at a rate of 25 m/s?
Answer:
F= 5000 N
Explanation:
This problem is related to force on a body, and to tackle it we need to apply newtons first law of motion which states that "a body will continue to be at rest or uniform motion except acted upon by an external force greater than the force keeping the body at rest or uniform motion"
given
mass m= 200kg
acceleration a= 25 m/s
we know that
F= ma
F= 200*25
F= 5000 N
The US Environmental Protection Agency issues a daily report for pollution levels called the __________.
A.
Pollution Advisory Warning
B.
Air Rating Level
C.
Particulates and Pollution Index
D.
Air Quality Index
Please select the best answer from the choices provided.
A
B
C
D
Answer:
D, Air Quality Index :)
Hope this helped!
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Which type of galaxy has arms that contain sites of active star formation and start close to a bulge in the center?
elliptical
irregular
barred spiral
normal spiral
The type of galaxy which has arms that contain sites of active star formation and start close to a bulge in the center is: D. normal spiral.
A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.
Generally, a star comprises two (2) main interstellar hot gases and these include:
I. Hydrogen (H).
II. Helium (He).
A galaxy refers to a collection of billions of stars, which are existing independently.
This ultimately implies that, the greatest number of stars are found in a galaxy.
According to astronomers, the galaxy is classified into four (4) main categories and these are:
Elliptical galaxy.Irregular galaxy.Peculiar galaxy.Spiral galaxy.Furthermore, spiral galaxies are divided into two (2) major groups such as:
I. Barred spiral.
II. Normal spiral.
A normal spiral is typically made up of arms containing sites of active star formation and it start close to a bulge in the center.
Find more information: https://brainly.com/question/17934476
Answer:
D) normal spiral
Explanation:
Whoever answered it practically wrote a life story. There's no need for an explanation; just get to the point and tell us the answer. But anways, the answer is D.
The velocity of a car increases from 2.0 m/s to 16.0 m/s in a time period of 3.5 s. What was the average acceleration?
Answer:4.0m/s^2
Explanation:
A line is represented by one point true or false
Which of the following processes puts carbon from a forest
floor back into the atmosphere?
Answer:
earth process meaning subduction
Running, swimming, and biking are what type of exercise aerobic or anaerobic
Answer:
aerobic is the correct answer
If you increase the amount of energy in an
ice cube, what would happen to the ice
cube?
A. It would change color.
B. It would become a liquid.
C. It would decrease in volume.
D. It would get harder.
synonym of an applied force
Answer:
Coerce, compel, constrain
Explanation:
A car with a mass of 1500 kg is traveling down the interstate at 25 m/s. What is the kinetic energy of the car, measured in Joules?
Answer:
The answer is
468 , 750 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]KE = \frac{1}{2} m {v}^{2} [/tex]
where
m is the mass of the object
v is the speed or velocity
From the question
m = 1500 kg
v = 25 m/s
The kinetic energy of the object is
[tex]KE = \frac{1}{2} \times 1500 \times {25}^{2} \\ = 750 \times 625[/tex]
We have the final answer
468 , 750 JHope this helps you
