Answer:I need this answer tooooo
Explanation:
A person ran with a speed of 6 m/s onto the skateboard .What is the speed with which he ride on the skate board
Answer:
Let's define:
M = mass of the person
m = mass of the skateboard.
We can write the momentum as:
P = M*v
Remember the conservation of momentum, as we can not find any force in this situation (a highly idealized situation) the momentum will be conserved.
if P is the momentum before the person rides the skateboard, P' will be the momentum after the person rides the skateboard.
P = M*v
P' = (m + M)*v'
We must have:
P = P'
Now, we can assume that the mass of the skateboard is a lot smaller than the mass of the person, such that:
m << M
then we can assume:
(m +M) ≈ M
then:
P' = (M + m)*v' ≈ M*v'
And this is equal to P.
M*v' = M*v
Then we must have that:
v' = v
and we know that v = 6m/s
Then v' = 6m/s
The velocity after riding the skateboard will be equal to the velocity before riding it (in this model)
In a more scientific way, the velocity after riding the skateboard will be a bit smaller than the velocity before, and it will depend on the mass of the person and the mass of the skateboard.
A toy car rolls down a hill starting from rest. After 4.2 seconds its velocity is 18 meters per second. What is the acceleration of the car?
Answer:
I think it’s 24
Explanation:
The current in secondary of coil of a transformer is 1 A and that in primary is 0.5 A. If 200V is available in the secondary what is the voltage in the primary?
Answer:
400 V
Explanation:
The following data were obtained from the question:
Current in secondary coil (Iₛ) = 1 A
Current in primary coil (Iₚ) = 0.5 A
Emf in secondary coil (Eₛ) = 200 V
Emf in primary coil (Eₚ) =.?
The voltage (i.e emf) in the primary coil can be obtained as illustrated below:
Eₛ / Eₚ = Iₚ / Iₛ
200/Eₚ = 0.5/1
Cross multiply
Eₚ × 0.5 = 200 × 1
Eₚ × 0.5 = 200
Divide both side by 0.5
Eₚ = 200/0.5
Eₚ = 400 V
Therefore, the voltage in the primary coil is 400 V
An object with zero acceleration is not changing its velocity
is peddling bicycle friction
Answer:
Yes
Explanation:
Answer:
Yes
Explanation:
friction: the resistance that one surface or object encounters when moving over another.
the speed and direction of an objects is it
Answer:
????
Explanation:
You do an experiment to find out how much light is needed to make house plants grow taller. The two variables in this experiment are amount of light and the height of the plants. Which variable is the dependent variable and which is the independent variable? Explain your answer.
Answer: To grow strong seedlings, the light should be placed close to the tray, and raised as the plants grow taller. The Independent variable of this experiment is the light that enter the plant. The Dependent variable is the height of the plant.
Explanation:
Describe how Kirschhoff's Circuit Laws relate to the law of conservation of energy
Answer:
Given that voltage is a measurement of energy per unit charge, Kirchhoff's loop rule is based on the law of conservation of energy, which states: the total energy gained per unit charge must equal the amount of energy lost per unit of charge.
Explanation:
1. A car travels a distance of 100 km in 2 hours. What is the average speed of the car (km/h)?
Answer:
50 km/h
Explanation:
d = 100km
t = 2 hours
average speed = total distance/total time
= 100/2 = 50 km/h
Hope this helps! If so please consider marking brainliest!
A jet airliner moving initially at 366 mph (with respect to the ground) to the east moves into a region where the wind is blowing at 127 mph in a direction 60◦ north of east. What is the new speed of the aircraft with respect to the ground?
Answer:
The new speed is [tex]V_r = 443.4 \ m/s[/tex] , in the direction [tex]\theta = 14.36^o[/tex] with respect to the ground
Explanation:
From the question we are told that
The initial speed of the jet airliner is 366 mph to the east (positive x - axis )
The direction of the wind is [tex]u = 127 \ mps[/tex] toward 60° north west
Generally the x component of jet airliner velocity is
[tex]v_x = 366 * cos (0) = 366 \ mph[/tex]
Generally the y component of jet airliner velocity is
[tex]v_y = 366 * sin (0) = 0 \ mph[/tex]
Generally the x component of winds velocity is
[tex]u_x = 127 cos(60) = 63.5 \ m/s[/tex]
Generally the y component of winds velocity is
[tex]u_x = 127 sin(60) = 109.99 \ m/s[/tex]
Generally the velocity of both the jet airliner and wind along the x-axis is
[tex]V_x = v_x + u_x = 366 + 63.5 = 429.5 \ m/s[/tex]
Generally the velocity of both the jet airliner and wind along the y-axis is
[tex]V_y = v_y + u_y = 0 + 109.99 = 109.99 \ m/s[/tex]
Generally the resultant velocity is
[tex]V_r = \sqrt{V_x^2 + V_y^2}[/tex]
=> [tex]V_r = \sqrt{429.5^2 + 109.99^2}[/tex]
=> [tex]V_r = 443.4 \ m/s[/tex]
The direction is
[tex]\theta = tan^{-1} [\frac{V_y}{V_x}][/tex]
=> [tex]\theta = tan ^{-1}[\frac{109.99}{429.5}][/tex]
=> [tex]\theta = 14.36^o[/tex]
Energy from the sun is produced through atomic explosions on the surface of the sun. true or false
Answer:
false
Explanation:
The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. During the fusion process, radiant energy is released.
A chicken runs across the street at a speed of 12 m/s. If the road is 36 meters across, how long does it take for the chicken to cross the road?
Answer:
3
Explanation:
Its not that hard....
If a chicken runs across the street at a speed of 12 m/s, and the road is 36 meters across, then the chicken takes 3 seconds to cross the road.
What is speed?Speed is the rate at which an object covers distance. It is the measure of how fast or slow an object is moving relative to a particular reference point.
Speed is usually expressed in units of distance per unit time, such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).
For example, if a car travels a distance of 100 kilometers in 2 hours, then its speed would be:
Speed = Distance / Time = 100 km / 2 hours = 50 km/h
This means that the car is covering a distance of 50 kilometers every hour.
Here in the Question,
To calculate the time it takes for the chicken to cross the road, we can use the formula:
time = distance/speed
where distance is the width of the road, and speed is the velocity of the chicken.
Substituting the given values, we get:
time = 36 meters / 12 m/s
time = 3 seconds
Therefore, it takes the chicken 3 seconds to cross the road.
To learn more about Kinetic Energy click:
brainly.com/question/26472013
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What’s the difference between front wheel, rear wheel, and 4 wheel drive?
Explanation:
front wheel uses power only in the front, rear uses it the back, and 4 wheel uses power in all the wheels
a car moves around a wide turn going 45 mi/he the whole time. the car has constant _____.
Answer:
constant speed
Explanation:
this is because it does not increase nor decrease
Explain why a man using a parachute falls through air slowly while a stone falls through air very fast
The compton effect was observable because Compton bombarded free electrons with
Answer:
wasnt it a key
Explanation:
HURRY I’LL MARK YOU AS BRAINLIEST!!
In a soccer game, a player uses force to kick the ball towards the goal.
In this analogy, what would represent the current? *
The player who kicks the ball
a. the player who kicks the ball
b. the ball
The circulatory system:
a. transports oxygen to the body's cells
b. absorbs oxygen from the lungs
c. carries oxygen in the bloodstream
d. all answers are correct
If John walks around the block, what distance does he travel?
Answer:
hmm do you now how to divide
or no
Explanation:
describe how do ions form?
Answer:
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by a combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.
Explanation:
Answer:
Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms. Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.
Explanation:hope dis helps u
Which idea of the geocentric model of the solar system was most contested by some philosophers?(1 point) a.The universe was the only object they could see. B.Earth was not moving. C.The motion of the planets was uniform and circular. D.Earth was the center of the universe.
Answer:
D.Earth was the center of the universe
Explanation:
In the geocentric model of the solar system, the earth was the center of the universe and the sun and planets orbited around it. As the oldest model that sought to understand the functioning of the solar system, it was little contested due to the difficulty of scientific resources for further investigation.
Gradually this model was shaping and being restructured, as new studies, equipment and technologies appeared that could help astronomers and physicists to develop the current theory, that in reality the sun is the center of the solar system.
Answer:
D
Explanation:
And object additionally addressed experience and acceleration of 9.8 m/s2 how much time will it take to achieve a velocity of 49 m/s
Answer:
YOU OR YOUR PARENTS VOTE BIDEN!TRUMP KILLED 223,000 PEOPLE AND HE STILL DOES NOT CARE! HE SAYS WE ARE ROUNDING THE CORNER. HE CAN NOT EVEN HAND OUT STIMULUS TO DYING BUISNESSES AND AIRLINES!
Explanation:
YOU OR YOUR PARENTS VOTE BIDEN!TRUMP KILLED 223,000 PEOPLE AND HE STILL DOES NOT CARE! HE SAYS WE ARE ROUNDING THE CORNER. HE CAN NOT EVEN HAND OUT STIMULUS TO DYING BUISNESSES AND AIRLINES!
After accelerating for 20 seconds, a DeLorean sports car is a wide range of speeds that it can achieve, depending on traction. The distribution of speed follows in approximately normal distribution with the meaning of 80 mph and a standard deviation of 7.7 mph Marty wants the next acceleration run to be in the fastest 15% of all possible speeds how fast will the car have to go
Answer:
72mph
Explanation:
z = (x-μ)/σ, where x is the raw score, μ is the population mean, and σ is the population standard deviation.
z score for 15th percentile = -1.036
Mean = 80 mph
Standard deviation = 7.7mph
Hence,
-1.036 = x - 80/7.7
Cross Multiply
-1.036 × 7.7 = x - 80
- 7.9772 = x - 80
x = 80 - 7.9772
x = 72.0228mph
Approximately 72 mph
describe the industrial application of crystalization
Answer:
Crystallization is one of the most widely used technologies in chemical industry, and process robustness governs process productivity and economics. In particular, the pharmaceutical and food sectors are utilizing crystallization for optimized separation, purification, and solid form selection.
If a person is walking at 4 m/s, how far can he travel in 30 seconds
Answer:
120 m
Explanation:
PLEASE HELP ASAP!!! WILL GIVE BRAINLIEST!!! (hint: please help with all five questions and not just one) THANK YOU FOR HELPING!!! I GREATLY APPRECIATE IT!!!
calculate the volume of a liquid with a density of 5.45g/cm³ or centimeter square and a mass of 65g.
Answer:
12 ml
Explanation:
The thing to remember about a substance's density is that it tells you the mass of every unit of volume of said substance.
If the amount a spring is stretched doubles, the elastic potential
energy stored will ...
A: halve
B: stay the same
C: double
D: quadruple
6.0 C when the current is 0.5 A
Explanation:
??? i don't really see a question here......
A ball is thrown upward with a speed of 30 m/s. Approximately how much time does it take the ball to travel from the release location (A) to its highest point (B)? Approximately how much total time is the ball in the air before it returns back to its original height (C)?
Answer:
The answer is below
Explanation:
Using the equation of newton law of motion for an object thrown vertially upwards:
v = u - gt
where u is the initial velocity, g = acceleration due to gravity and t is the time taken to reach maximum height.
Given that u = 30 m/s, at maximum height, v = 0, g = 10 m/s². Therefore:
0 == 30 - 10t
10t = 30
t = 30/10
t = 3 seconds
b) The time taken to reach the highest point = 3 seconds. Therefore the total time before it returns back to its original height = 2t = 2(3) = 6 seconds