help me plzzz. i’ll give brainliest!!!
1. In the 1950's, an experimental train that had a mass of 2.50 x 10* kg, was powered across
a level track by a jet engine that produces a thrust of 5.00 x 10' N for a distance of 5.00 x
107 m. What is the final speed of the train if there was no friction?
2. A hockey puck is accelerated, using a hockey stick, over a smooth, level ice surface. The
puck has a mass of 0.400 kg and is moved by the stick for a distance of 0.800 m. What
was the average force applied to the puck if the final speed is 25.0 m/s?
Answers
Answer:
2140
Explanation:
Related Questions
A scientist obtains images of a particular star, which appears as four separate stars.
Which phenomenon causes the star to appear this way?
O redshift
gravitational lensing
O principle of equivalence
O gravitational time dilation
Answers
Answer:
gravitational lensing
Explanation:
Answer:
Gravitational lensing
Explanation:
7. What do the following scientists study:
a. Geologists -
b. Zoologists -
c. Anthropologists -
d. Botanists -
e. Chemists -
f. Physicists -
on line papper
Answers
These scientists are known to study different aspects of science. The study they engage are;
What do scientists studya. Geologists - study the physical structure and composition of the Earth, including rocks, minerals, and natural resources.
b. Zoologists - study animals, their behavior, physiology, evolution, and distribution.
c. Anthropologists - study human societies, cultures, and behavior across time and space.
d. Botanists - study plants, their physiology, structure, ecology, and evolution.
e. Chemists - study the composition, properties, and behavior of matter and the chemical changes it undergoes.
f. Physicists - study the fundamental principles that govern the behavior of matter and energy in the universe, including mechanics, thermodynamics, electromagnetism, quantum mechanics, and relativity.
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With explanation pls
Answers
Answer:
\((x \times 1) = (400 \times 2.5) \\ x = 1000 \: newtons\)
\(y = 0\)
What is the relationship between the external and spring force
Answers
Answer:
Elastic force occurs in the spring when the spring is being stretched/compressed or deformed (Δx) by the external force. Elastic force acts in the opposite direction of the external force. It tries to bring the deformed end of the spring to the original (equilibrium) position.
Explanation:
What type of atomic radiation will most deeply penetrate matter?
Multiple Choice
Beta radiation
Gamma radiation
Alpha radiation
Answers
Gamma rays can be emitted from the nucleus of an atom during radioactive decay. They are able to travel tens of yards or more in air and can easily penetrate the human body. Shielding this very penetrating type of ionizing radiation requires thick, dense material such as several inches of lead or concrete.
A natural disaster speech
Answers
A man pushing a crate of mass
m = 92.0 kg
at a speed of
v = 0.855 m/s
encounters a rough horizontal surface of length
ℓ = 0.65 m
as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.359 and he exerts a constant horizontal force of 289 N on the crate.
A man pushes a crate labeled m, which moves with a velocity vector v to the right, on a horizontal surface. The horizontal surface is textured from the right edge of the crate to a horizontal distance ℓ from the right edge of the crate.
(a) Find the magnitude and direction of the net force on the crate while it is on the rough surface.
magnitude
N
direction
Opposite Direction or Same Direction
(b) Find the net work done on the crate while it is on the rough surface.
J
(c) Find the speed of the crate when it reaches the end of the rough surface.
m/s
Answers
(a) The magnitude and direction of the net force on the crate while it is on the rough surface is 34.7 N in opposite direction.
(b) The net work done on the crate while it is on the rough surface is -22.6 J.
(c) The speed of the crate when it reaches the end is 0.5 m/s.
What is the net force on the crate while it is on the rough surface?
The magnitude and direction of the net force on the crate while it is on the rough surface is calculated as follows;
F (net) = F - Ff
where;
F is the applied forceFf is the frictional force on the crateF (net) = F - μmg
where;
μ is the coefficient of frictionm is massg is gravityF (net) = 289 N - (0.359 x 92 X 9.8)
F (net) = -34.7 N
The negative sign indicates opposite direction to the applied force.
The net work done on the crate while it is on the rough surface is calculated as follows;
W = F(net) x L
where;
L is the distance travelled by the crateW = -34.7 x 0.65
W = -22.6 J
The speed of the crate when it reaches the end is calculated as follows;
acceleration of the crate = F(net) / m
a = -34.7 N / 92 kg
a = -0.377 m/s²
v² = u² + 2aL
v² = ( 0.855)² + ( 2 x -0.377 x 0.65)
v² = ( 0.855)² - ( 2 x 0.377 x 0.65)
v² = 0.24
v = √ 0.24
v = 0.5 m/s
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1. Wha' is the relationship between potential and kinetic energy?
As potential energy increases, kinetic energy increases.
b. As potential energy increases, kinetic energy decreases.
C. As potential energy decreases, kinetic energy decreases.
d. Potential and kinetic energy are two separate things and have no
relationship.
Answers
Answer:
B
Explanation:
The kinetic energy in an object is converted into potential energy. This makes the kinetic decrease, while the potential increases.
If the fundamental frequency of this harmonic is 7 Hz, at which frequency is this created? (Just type the number, not the units) pic attached below
Answers
If the fundamental frequency of the harmonic is 7 Hz, the frequency at which it is created depends on the harmonic being referred to.
How do we explain?Frequency of harmonics
If the fundamental frequency of a harmonic is 7 Hz, then the frequency at which the harmonic is created depends on the harmonic series being used.
The frequency of the nth harmonic in a harmonic series is equal to n times the fundamental frequency. Therefore, the first five harmonics of a harmonic series with a fundamental frequency of 7 Hz would be:
First harmonic (fundamental): 7 Hz
Second harmonic: 2 x 7 Hz = 14 Hz
Third harmonic: 3 x 7 Hz = 21 Hz
Fourth harmonic: 4 x 7 Hz = 28 Hz
Fifth harmonic: 5 x 7 Hz = 35 Hz
So, the frequency at which the harmonic with a fundamental frequency of 7 Hz is created depends on which harmonic is being referred to.
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What is the vector sum of a vector T~ given by 40 m, 30 degrees and a vector U~ given by 12
m, 225 degrees?
Answers
Hence, R = 28.97 m, 24.5 degrees is the vector sum of T and U.
Is a vector at 30 degrees?A vector's direction is frequently stated as a rotation of the vector's "tail" anticlockwise with respect to due East. In accordance with this practise, a vector having a direction of 30 degrees is a vector that has been anticlockwise rotated 30 degrees with respect to due east.
Let's begin by separating the components of the vector T:
T~ = 40 m, 30 degrees
T_x = 40 cos(30) = 34.64 m
T_y = 40 sin(30) = 20 m
Let's now decompose the vector U into its constituent parts:
U~ = 12 m, 225 degrees
U_x = 12 cos(225) = -8.49 m
U_y = 12 sin(225) = -8.49 m
It is possible to combine elements of the same type (x and y):
R_x = T_x + U_x = 34.64 m - 8.49 m = 26.15 m
R_y = T_y + U_y = 20 m - 8.49 m = 11.51 m
The Pythagorean theorem can be used to determine the size of the resulting vector R:
|R~| = sqrt(R_x² + R_y²) = sqrt((26.15 m)² + (11.51 m)²) = 28.97 m
The inverse tangent function can be used to determine the direction of the resulting vector R:
theta = tan⁻¹(R_y/R_x) = tan⁻¹(11.51 m/26.15 m) = 24.5 degree.
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an air conditioner is label 1500-watt 240v If it is used for 8 hours, calculate the electrical energy that has been used.Required to answer. Single choice.
Answers
Answer:
Energy = 12000 [kw*h]
Explanation:
In order to solve this problem, we must multiply the power used by the amount of time in use.
\(Energy = Power*time\\Energy = 1500*8\\Energy = 12000 [kW*h]\)
what is capasistanceb
Answers
\(\sf\huge\underline\pink{Answer:-}\)
Capacitance is the ratio of the change in the electric charge of a system, to the corresponding change in its electric potential.\(\rightarrow\)The capacitance of any capacitor can be either fixed or variable depending on their usage.
\(\rightarrow\)Capacitance is expressed as the ratio of the electric charge on each conductor to the potential difference (i.e., voltage) between them.
\(\rightarrow\)The capacitance value of a capacitor is measured in farads (F), units named for English physicist Michael Faraday (1791–1867).
\(\sf\large\underline\blue{Formula:-}\)
➢ \(\sf\green{q = CV}\)
Where,
\(\rightarrow\sf{q = charge}\)
\(\rightarrow\sf{C = capacitance}\)
\(\rightarrow\sf{V = voltage}\)
_______________________________
Which layer of the atmosphere is the least dense?
Question 5 options:
exosphere
thermosphere
mesosphere
troposphere
Answers
the exosphere is the least dense
Answer:
exosphere
Explanation: Just took the quiz and got an A, 100%
A concave lens cannot produce a real image.
A. True
B. False
Answers
Answer:
B. False
A concave mirror and a converging lens will only produce a real image if the object is located beyond the focal point.
~Hoped this helped~
~Brainiliest?~
plzzz help will give brainlist
Below are views related to education.
---------------------------
Civics should be taught in public schools.
Good citizenship is learned in communities.
---------------------------
Which conclusion can be drawn from these views?
A. Civic involvement is important to building strong societies.
B. Civic participation should be learned at home.
C. Political conflict is a threat to strong societies.
D. Political conflict should be reduced through legislation.
Answers
Answer:
A.
Explanation:
this would make sense but it seems to be more like they both sound different
Traveling waves propagate with a fixed speed usually denoted as v (but sometimes c). The waves are called __________ if their waveform repeats every time interval T. Traveling waves propagate with a fixed speed usually denoted as (but sometimes ). The waves are called __________ if their waveform repeats every time interval . transverse longitudinal periodic sinusoidal
Answers
Answer:
Periodic.
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Generally, the most commonly used electromagnetic wave technology in telecommunications is radio waves.
Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.
Basically, as a result of radio waves having long wavelengths, they are mainly used in long-distance communications such as the carriage and transmission of data.
Generally, a fixed speed is used for the propagation of traveling waves and this speed is usually denoted with the variable "v" or sometimes "c."
Furthermore, if the waveform of a traveling wave is repeated every time at specific intervals T, it is referred to as periodic wave.
Mathematically, the period of a traveling wave is given by the formula;
\( Period = \frac {1}{T} \)
Where;
T is the time measured in seconds.
In which situation would you see a partial lunar eclipse?
Answers
Answer:
C
Explanation:
It happens when the a portion of the moon passes through the earth's shadow
In 1988, Galena Christyakova set the woman’s long jump record of 7.52 meters. In 1991, Mike Powell set the men’s long jump record of 8.95 meters. How much farther (EF) would Galena have to jump in order to tie Mikes record?
A.8.95 meters
B.1.43 meters
C.1.19 meters
D.16.47 meters
E.0.84 meters
Answers
Answer:
Option (B)
Explanation:
From the picture attached,
Galena set the record in women's long jump DE = 7.52 meters
Similarly, in men's long jump Powell set the record DF = 8.95 meters
Therefore, Galena has to jump more distance to meet the record of Powell.
Distance EF needed more by Galena,
EF = DF - DE
EF = 8.95 - 7.92
EF = 1.43 meters
Therefore, Galena has to jump 1.43 meters more to tie Powell's record.
Option (B) will be the answer.
Goal posts at the ends of football fields are padded as a
safety measure for players who might run into them. How
does thick padding around the goal post reduce injuries
to players?
It would be awesome if you could use a sample response
Answers
Goal posts at the end of football field are padded as a safety measure to players who might run into them,these thick paddings of the goal posts are done to prevent injuries to the players because the padding of the goal post increases the time of impact and this in-turn decreases the force on the the players body or the force it will have when a player's body hit against it and therefore decreasing the force applied to bring the player to a stop.
We can also say that it increases the time of collision between the player's body and the post.
Một chất điểm chuyển động tròn đều, sau 5 giây nó quay được 20 vòng. Chu kì quay của chất điểm là:
Answers
Answer:
T=0,25s
Explanation
5s>20vong 1s>4vong
omega= 8pi
omega=2pi/T
What is the work-energy theorem equation?
Answers
Answer:
W = Fd = KE =1/2mv²
Explanation:
not sure if that's what your looking for but i'm pretty sure this is it.
An automobile is driven on a straight road, and the distance traveled by the automobile after time t=0 is given by a quadratic function a where a(t) is measured in feet and t is measured in seconds for 0 <= t <= 12. Of the following, which gives the best estimate of the velocity of the automobile, in feet per second, at time t = 8 seconds?
a. s(8)
b. s(8)/8
c. s(12)- s(2)/ 12-2
d. s(9)- s(7)/9-7
Answers
Answer:
\(Velocity = \frac{s(8)}{8}\)
Explanation:
Given
\(0 \leq t \leq 12\)
Required
Determine the velocity when t = 8
This type of velocity is referred to as an instantaneous velocity.
In this case, it is calculated using
\(Velocity = \frac{Distance\ at\ 8 second}{t = 8}\)
Given that s(t) models the distance;
s(8) = distance at 8 seconds
So;
\(Velocity = \frac{s(8)}{8}\)
Option B answers the question
Someone help me please !!!! Will mark Brianliest !!!!!!!!!!!!!!!!
Answers
Answer:
Decant it.
Explanation:
Pour the water/sugar solution off the sand. When the sand wants to start coming out as well, Stop and add fresh water to the beaker, stir to rinse the remaining solution into a less concentrated solution and decant again.
Repeat the dilution process until the mix is essentially sand and water, then drive the remaining water from the sand by drying.
10POINTS!!
A satellite orbits Earth 350 km above Earth's surface. Calculate the free-fall acceleration at this altitude.
Answers
Answer:
8.82 m/s²
Explanation:
Formula for the free fall or gravitational acceleration is;
a = GM/r²
Where;
G is gravitational constant = 6.67 × 10^(-11) m³/kg.s²
M is mass of earth = 5.972 × 10^(24) kg
r is radius of earth = 6371 km
We are given that the satellite orbits Earth 350 km above Earth's surface.
Thus, new radius = 6371 + 350 = 6721 km = 6721000 m
Thus;
a = (6.67 × 10^(-11) × 5.972 × 10^(24))/(6721000²)
a = 8.82 m/s²
Which of the following is the best example of work being done on an object?
A. holding a 50 kg barbell
B. lifting a bag of groceries
C. keeping a board in place
D. pushing on a car that will not move
Answers
Answer:
B
Explanation:
When you lift something you are applying Force and Movement.
The two things we use in Work formula.
The other options you don´t have any movement happening.
Lifting a bag of groceries is the best example of work being done on an object because it is the only case from the given list in which both force and displacement are present,
Therefore the correct answer is option B.
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance.
The SI unit of work done by an object is Joules.
The best example of work being done on an item is lifting a bag of groceries since it is the only instance from the list given in which both force and displacement are present, and both external force and displacement are required to do any non-zero work.
Thus, the correct answer is option B.
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35 milliseconds?! that is crazy fast. Another
way to write that is 0.035 seconds. If the
airbag has to inflate 1 meters. How fast does
this airbagtravel? (remember velocity =
distance/time)
Answers
Answer:
28 m/s
Explanation:
1m / 0,035 s
v = 28.57 m/s
if you want km/h, multiply witz 3,6
102,85 km/h = 28,57 m/s
A gas at 110atm and 303K filled a container of 2L. If the temperature is raised to 353 K and the pressure is increased to 440atm, what is the new volume
Question 4 options:
5.8 L
0.58 L
58 L
10.6 L
Answers
Answer:
0.58 L
Explanation:
For this problem we need to simply use the ideal gas equation to create a proportional comparison for the initial information to the final information.
(P_1 * V_1) / T_1 = (P_2 * V_2) / T_2
Using this, we can solve for V_2 to find the new volume of the gas once pressure and temperature changes.
(P_1 * V_1) * T_2 / T_1 = (P_2 * V_2)
(P_1 * V_1) * T_2 / (T_1 * P_2) = V_2
Consider our givens:
P_1 = 110atm
T_1 = 303K
V_1 = 2L
P_2 = 440atm
T_2 = 353K
Now we simply plug in these values to the equation to find the new volume, V_2.
(P_1 * V_1) * T_2 / (T_1 * P_2) = V_2
(110atm * 2L) * 353K / (303K * 440atm) = V_2
77660 atm*L*K / 133320 K*atm = V_2
0.583 L = V_2
Hence, the new volume is 0.583 L.
Cheers.
find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 28° below the horizontal
Answers
Given:
The acceleration of the child, a=1.26 m/s²
The angle of inclination, θ=28°
To find:
The coefficient of kinetic friction between the child and the slide.
Explanation:
The net force acting on the child when it is sliding down the slide is given by,
\(\begin{gathered} ma=mg\sin\theta-f \\ =mg\sin\theta-N\mu \\ =mg\sin\theta-mg\cos\theta\text{ }\times\mu \end{gathered}\)Where f is the frictional force, N is the normal force acting on the child, g is the acceleration due to gravity, and μ is the coefficient of kinetic friction.
On simplifying the above equation,
\(\begin{gathered} a=g\sin\theta-g\mu\cos\theta \\ \implies g\mu\cos\theta=g\sin\theta-a \\ \implies\mu=\frac{g\sin\theta-a}{g\cos\theta} \end{gathered}\)On substituting the known values,
\(\begin{gathered} \mu=\frac{9.8\sin28\degree-1.26}{g\cos28\degree} \\ =0.386 \end{gathered}\)Final answer:
The coefficient of kinetic friction between the child and the slide is 0.386
A trebuchet launches a pumpkin at an angle of 27 degrees at an initial velocity of 32 m/ s from the ground. What is the apogee of the pumpkin?
Answers
Answer:
10.77 m
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 32 m/s
Angle of projection (θ) = 27°
Acceleration due to gravity (g) = 9.8 m/s²
Apogee i.e maximum height (H) =?
Thus, the apogee i.e the maximum height of the pumpkin can be obtained as follow:
H = u² Sine² θ /2g
H = 32² × (Sine 27)² / 2 × 9.8
H = 1024 × (0.454)² / 19.6
H = (1024 × 0.206116) / 19.6
H = 10.77 m
Thus, the apogee i.e the maximum height of the pumpkin is 10.77 m.
What is the magnitude of the resultant of a 61m north and 21m south vector?
Answers
Answer:
1281
Explanation:
what is the magnitude of the resultant of a 61m north and 21m south vector