Based on the length of a football field and the timeline of earth's history, the first 10 yards represents 460 million years.
Beginning from 460 million years ago, there was massive explosion and expansion of life on earth.
What is a timeline of earth's history?A timeline of earth's history shows the events that occurred from the beginning when earth was formed 4.6 billion years ago until today.
In this activity, a football field is used to represent the timeline of earth's history.
Each end of the football field represents the two end zones, Earth's beginning and TODAY end zone.
A football field is 100 yards long.The earth is 4,600,000,000 years old.Each yard equals 46,000,000 yearsThus, the first 10 yards equals = 46,000,000 × 10 The The first 10 yards = 460,000,000 years.
From the TODAY end zone, the the first 10 yards = 460,000,000 years.
460,000,000 years ago marked the time from the appearance of the first plants until humans and all life on earth as it is today.
This, meant that within this period, there was massive explosion and expansion of life on earth.
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A boat is traveling upstream at 14 km/h with respect to the water of a river. The water itself is flowing at 9 km/h with respect to the ground. What is the velocity of the boat with respect to the ground
Answer:
16.64 km/h
Explanation:
Think of the x and y components as the a and b sides of a triangle and simply do the Pythagorean Theorem:
[tex]a^2+b^2=c^2[/tex]
[tex]14^2+9^2=c^2[/tex]
[tex]\sqrt{196+81}=c[/tex]
[tex]\sqrt{277}=c[/tex]
[tex]16.64 km/h[/tex]
Suppose wind blows on the model house from the left and
also produces an upward force on the roof. What reaction forces are
needed to support the weight of the roof and counteract forces from the wind?
The reaction force is the force that counterbalances the weight of the roof and acts upwards.
What is reaction force?The question is incomplete but I will try to help you the much I can. The image of the house is not shown hence the free body diagram can not be produced.
However, let me explain to you that force is a vector hence it has direction. The total resultant force is obtained by taking the direction of all the forces into account and this is called resolution of the forces. The reaction force is the force that counterbalances the weight of the roof and acts upwards.
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How many protons, neutrons, and electrons does a neutral atom of copper-65 have?
Answer:
An atom of Cu-63 has 34 neutrons and an atom of Cu-65 has 36 neutrons. 27- The total number of electrons in an atom of Cu-65 is 29 because copper has atomic number of 29, which simply means that an atom of copper has 29 protons and 29 electrons.
Explanation:
Answer:
Copper-65 has 36 neutrons, 29 electrons and 29 protons
Explanation:
True or false: If the net external force on a system is zero, then the momentum of a system is constant even if objects in the system collide and exert forces on one another.
Answer:
True: if no external forces act on a system of objects then the total momentum of the system is unchanged.
It is true that if the net external force on a system is zero, then the momentum of a system is constant even if objects in the system collide and exert forces on one another.
What is momentum?Momentum is simply a quantity of motion. Quantity is measurable in this case because if an object is moving and has mass, it has momentum.
If an object does not move, it does not have momentum. However, it is important in everyday life, but many people are unaware of it.
According to the law of conservation of momentum, the momentum of a closed system is constant over time (conserved).
A closed (or isolated) system is one in which the mass remains constant and the net external force is equal to zero. Only when a system is closed does its total momentum become conserved.
Thus, the statement is true.
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The prefix "deka" is used to designate which power of ten?
21
9-
ОООО
6
1
Answer:
1 is the power of ten.
Explanation:
[tex]10^1[/tex] is deka.
Basically 10 is deka, same result as [tex]10^1[/tex].
List any 10 home appliance in which different types of electric components are used
Air Conditioner.
Washing Machine.
Refrigerator.
Induction Stove.
Vacuum Cleaner.
Camera
Microwave Oven.
Water Purifier
What form does the signal take while it is broadcast from a transmitting station to your radio or television, regardless of whether it is a digital or analog wave? transverse longitudinal mechanical sound.
Answer:
transverse
Explanation:
Answer:
Transverse wave is the correct answer, the person above me is correct!
~Hope this helps! :)
A particle with charge Q and mass M has instantaneous speed u1 when it is at a position where the electric potential is V1. At a later time, the particle has moved a distance R away to a position where the electric potential is V2. Which of the following equations can be used to find the speed u2 of the particle at the new position?
a. 1/2M(μ2^2-μ1^2)=Q (v1-v2)
b. 1/2M(μ2^2-μ1^2)^2=Q(v1-v2)
c. 1/2Mμ2^2=Qv1
d. 1/2Mμ2^2=1/4πx0 (Q^2/R)
Answer: A
Explanation:
How long does an object accelerating at minus,−6.7m/s 2 take to change velocity from ,26m/s to,0m/s?
vf² = vi² + 2.a.d
0 = 26 + 2.(-6.7).d
13.4d = 26
d = 1.94 m
A 51.7-kg hiker ascends a 43.2-meter high hill at a constant speed of 1.20 m/s. Determine the work done in climbing the hill.
60 PTS + BRAINLIEST
1. A virtual image is 3 meters behind a flat mirror and it is 2 meters tall. What is the height and distance from the mirror, for the object?
2. A concave mirror has a focal length of 1 meter. An object is 2 meters from the mirror. What is the image distance from the mirror?
3. Alens has a focal length of -10 cm. If the image of an object is located at -20 cm, what is the distance of the object?
Answer:
1. The distance of image from the plane mirror is same as the distance of object (person) from the plane mirror but the image is formed behind the mirror.
v=u=3 m
Thus distance between image and the person d=u+v=3+3=6 m
2.A concave mirror has a radius of curvature of 1.0 m. An object is placed 2.0 m in front of the mirror. Can you determine the location of the image (in cm)
1/v = 1/f - 1/u = 1/50 - 1/200 = 4/200 - 1/200 = 3/200
v = 200/3 c
NUMBER 3 Ans: 18.75 cm.
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in your own words how does accomplish your goals influencing athletes?
Answer:
Goal setting can improve performance, influence motivation, and help athletes reach their potential. It can influence athletes by motivating them to work harder
Explanation:
A child pulls a balloon for 12m with a force of 1.0N at an angle 60 degrees below horizontal.How much work does the child do on the balloon?
Answer:
Distance for which the balloon has been pulled by the child = 12 meter
Force applied by the child to pull the balloon = 1.0 Newton
The angle below horizontal = 60 degree
These information's are already given in the question. Based on the above information's the answer to the question can be easily determined.
We know that
Work done = Force * Distance * Cos(60)
= 1 * 12 * (1/2)
= 1 * 6
= 6 Joules
So the work done by the child is 6 joules. I hope the procedure is clear enough for you to understand. Based on the above mentioned procedure, you can always solve problems of similar kind without taking any outside help.
Explanation:
What kinds of effects can humans have on food webs in ecosystems?
A 30 cm scale has one end broken. The mark at the broken end is 2.6 cm. How would you use it to measure the length of your pencil
pls tell correct ans
Answer:
the mark of the broken end is 2.6 cm so, we use the scale from the next full mark i.e. 3cm
Explanation:
we now measure the length of the pencil by keeping the 3 cm mark of the scale at it's left end.
The 3 cm value is then subtracted from the scale reading at the right side end of the pencil to obtain the correct length of the pencil. ✏️
(i i ) place the scale in the contact with object along it's length
(2) Your eyes must be exactly in front of the point where the measurements to be taken.
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Why do you put a voltmeter in parallel with a resistor in order to measure the change of electric potential energy?.
Answer:
A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. An ammeter is a measuring device used to measure the electric current in a circuit. A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.
Explanation:
Hope this helps:)
What is the difference of Mitosis and Meiosis? Please explain it in easy way.
Answer:
The nuclear division processes of mitosis and meiosis occur during cell division. During mitosis, body cells are divided, while during meiosis, s3x cells are divided. At mitosis, a cell divides once; at meiosis, it divides twice.
Explanation:
physics newton's second law projectile
1. Every morning, from their house to the bus stop Raine has to walk 12 m west , 24 m North and 12m East in 80 s . a) What is the total distance travelled by Raine ? b) What is her average speed? c) What is the total displacement of Raine? d) What is her average velocity.
2. A bus travels on an interstate highway at an average speed of 85 km/h. How far does the bus travel in 1.5 hours?
3. A postman delivers a letter to a recipient who lives 24.0 km away from the post office. If it took the postman 0.50 h to reach the recipient's home, what is the speed of the postman?
Answer correctly pls i have no points left :(
Q1) [refer attached photo]
a) know that distance is the length between two points
so
the total distance travelled by Raine = 12m + 24m +12m
= 48m
b) Average speed is total distance travelled divided by total time taken by object.
= 48m / 80s
= 0.6 ms^-1
c) know that displacement is the shortest distance between two points.
total displacement = 24m
d) since we don't know about the velocities ( i.e initial and final ) average velocity can be found with displacement ( s ) divided by time interval ( t ) of the displacement.
avg. velocity = s/t
know that displacement is the shortest distance between two points.
displacement = 24m
average velocity = 24m/ 80s
= 0.3 ms^-1
Q2)
Average speed (85 km/h) is total distance travelled divided by total time taken (1.5 hours)
total distance = speed × time
= 85 × 1.5
= 127.5 km
Q3)
24km / 0.50h = 48km/h
Which city is known as the richest square mile on earth?.
Answer:
Central City is the county seat and the most populous municipality of Gilpin County. The city is a historic mining settlement founded in 1859 during the Pike's Peak Gold Rush and came to be known as the "Richest Square Mile on Earth".
An object orbiting the sun in a circle can be said to be.
Answer:
An object orbiting the sun in a circle can be said to be. Always accelerating. :)
The electricity received at an electrical substation has a potential difference of 20,000 V. What should the ratio of the turns of the step-down
transformer be to have an output of 500 V?
Help plzzz
The turn ratio of the transformer is 40.
What is a transformer?A transformer is an electrical device that is used to step up or step down voltage.
The formula for calculating the turns ratio of a transformer is given below.
Formulaa = V/v.......... Equation 1Where:
V = Primary voltagev = Secondary voltagea = Turns ratio of the transformerFrom the question,
Given:
V = 20000 Vv = 500 vSubstitute the values above into equation 1
a = 20000/500a = 40.Hence, The turn ratio of the transformer is 40.
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A textbook with a weight of 20 N is lifted 0.7 meters from the ground. What is the work, in joules, needed?
A 1000 kg car is pushed with 400 N of force over 50 meters. What is the work, in joules, needed?
A student pushes a cart with 10 N of force for 20 meters. What is the work, in joules, needed?
Answer:
14J
20000J
200J
Explanation:
formula :W=FS
W:work done
F:force (N)
S:displacement moved in direction of force (m)
1) 20N×0.7m
=14J
2) 400N×50m
= 20000J
3) 10N×20m
=200J
Which of the following is a correct
definition of the word "contingencies"?
Answer:
I already told ya
Explanation:
i got brainly so i could learn
kinetic energy is _____ proportional to the ____ velocity
directly amount
directly square
directly cube
inversely square
Answer:
Kinetic energy is DIRECTLY PROPORTIONAL TO MASS AND VELOCITY
75 POINTS!!
In the experiment described in the scenario, which group represents the control group?
A.) Plant D
B.) Plant B
C.) Plant C
D.) Plant A
A method of heat loss in which the layer of heated air next to the body is constantly being removed and replaced by cooler air is called
Answer:
forced convection cooling
Explanation:
A person exerts 12.0 N on a 0.145 kg baseball for 0.480 s. What is the change in velocity of the base ball?
The change in velocity of the baseball is 39.72 m/s
What is change in velocity?
This is the difference between the final and the initial velocity of a body.
To calculate the change in velocity of the ball, we use the formula below.
Formula:Ft = mΔv.............. Equation 1Where:
F = Force exerted by the persont = timem = mass of the baseballΔv = Change in velocity.Make Δv the subject of the equation
Δv = Ft/m........... Equation 2From the question,
Given:
F = 12 Nt = 0.480 sm = 0.145 kgSubstitute these values into equation 2
Δv = (12×0.48)/0.145Δv = 39.72 m/s.Hence, The change in velocity of the baseball is 39.72 m/s
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Three materials were rubbed with an insulating cloth and tested to determine their charge. The table shows the results. Which material could be a metal?
Answer:
When two materials are rubbed together, the material with the greatest affinity for electrons is the material which takes electrons away from the other material. Saran wrap takes electrons from nylon and acquires the negative charge. In turn, the nylon loses electrons and becomes charged positively.
I think it's right, HOPE IT HELPS AND BE SAFE :D
13. If a 40,000g cannon ball is 35m above the Earth's surface, how much potential energy does the cannon
ball have?
Answer:
PE = 13734 Joules
Step-by-step explanation:
Formula: PE = m * g * h
Givens
m = 40000 grams
m = 40000 grams * 1kg/1000 grams = 40 kg
g = 9.81
h = 35 m
PE = 40 * 9.81 * 35
PE = 13734 Joules