Answer:
20 minutes
Explanation:
Create a proportion.
x = time for 23 miles of travel
70 miles/hr = 23 miles/ x
--- Cross Multiply
70x = 23 --- Divide 70 on both sides
x = 0.32857 hrs....
multiply your value of "x" by 60 min/hr in order to convert to minutes
0.32857 hrs * 60min/1hr
hr(s) cancels out
x = 19.7143... ~ 20 mins
Helicopter rescue winch-men must dangle a metal wire below them so that it always touches the ground or water surface first. This discharges __________ __________ that may have built up on the helicopter. What two words complete the sentence?
Answer:
static electricity
Helicopter rescue winch-men must dangle a metal wire below them so that it always touches the ground or water surface first. This discharges static electricity that may have built upon the helicopter.
What is static electricity?Static electricity is a familiar electric phenomenon in which charged particles are transferred from one body to another. For example, if two objects are rubbed together, especially if the objects are insulators and the surrounding air is dry, the objects acquire equal and opposite charges.
What is static electricity caused by?Static electricity is generated by friction between two insulating materials. When the materials are rubbed together, electrons are removed from atoms within the materials, giving rise to a static electric charge.
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Another unfortunate bug splatters on the windshield of a moving car. Which has the greater change in momentum---the bug or the car?
Answer:
The change in momentum for the bug and the car will be equal, impulses will be equal in opposite directions and the bug will have a greater acceleration compared to the car, because it has a smaller mass.
Explanation:
Hope this helps..
What Lags harder than my Nokia
my brain.
Explanation:
...................
Answer:The Nokia XR20. ... HMD Global said the Nokia XR20 is the most durable phone it's created to date. The XR20 sports a tough 6.67-inch Gorilla Glass Victus display from American tech firm Corning and can resist damage from scratches and drops from about 6 feet, the company says.Jul 26, 2021
Explanation:
what is the force of a punch if it accelerates at 0.2m/s2 and has a mass of 2kg?
Answer:
0.4 N
Explanation:
We know ,
F = maF = 0.2 * 2 NF = 0.4NA girl is riding a bike with a velocity of 7 m/s. The bike undergoes an acceleration of 2 m/s2. What is the velocity of the bike after 2 seconds
From the information provided, the velocity after 2 seconds is 11 m/s.
From the equations of motion;
v = u + at
Where;
v = final velocity
a = acceleration
t = time taken
The initial velocity of the bike was 7 m/s and its acceleration is 2 m/s2. This change occurred within a time of 2 seconds.
Hence;
v = 7 + 2(2)
v = 11 m/s
The velocity after 2 seconds is 11 m/s.
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A child throws a ball up with an initial velocity of 4
m/s. If the starting height of the ball was 2.5 meters,
what will be the height of the ball after 0.5 seconds?
Use a = -9.8 m/s/s.
The height of the ball after the given time of motion is 3.275 m.
The given parameters;
initial velocity of the ball, u = 4 m/sheight of fall of the ball, h = 2.5 mtime of motion, t = 0.5 sThe distance traveled by the ball is calculated as follows;
[tex]h =h_0 + ut - \frac{1}{2}gt^2 \\\\h = 2.5 + 4(0.5) - (0.5\times 9.8\times 0.5^2)\\\\h = 3.275 \ m[/tex]
Thus, the height of the ball after the given time of motion is 3.275 m.
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the attractive or repulsive force between objects is called
I NEED HELP I AM SO CONFUSED, WILL GIVE BRAIN.
1. What is the acceleration of a spaceship that can accelerate from 10,000 m/s to 17,500 m/s in 20 seconds?
2. How long does it take the principal to run to our classroom, if the distance is 125 meters, and he accelerates, from rest, at a rate of 4 m/s^2?
3. A pen falls off my desk. It took 1.5 seconds to fall. What was the velocity of the pen just before it hit the ground?
4. You are standing at the edge of a cliff that is 40m tall. You throw an apple down with a speed of 15 m/s. How long does it take to fall to the bottom of the cliff?
5. A stone is dropped from the roof of a building. It took 5 s for the stone to reach the ground. What is the height of the building?
6. A man is on a 30m cliff and throws a ball down with a speed of 7 m/s.
A) With what velocity does the ball hit the ground? B) How high above the ground is the ball after the ball has fallen for 1 second?
7. A watermelon is dropped from rest from the top of a 20m cliff. A) How long does the watermelon be in the air?
B) What was the watermelon’s final velocity?
The kinematic relations allow finding the results for the different questions are:
1. The acceleraations is a = 375 m/s²
2. The time is t = 62.5 s
3. The velocity at the ground is v = -14.7 m / s
4. The time to the bottoncliff is 1.7 s
5. The height isy₀ = 122.5 m
6.
A) The velocity is v = 25.2 m / s
B) The height for t=1 s is y = 18.1 m
7.
A) Time in the air is t = 2 s
B) The final veloicty is v = - 19.6 m / s
Kinematics analyzes the movement of bodies, finding relationships between the position, velocity and acceleration of bodies.
Let's look for the answers to a series of questions:
1. They indicate the initial and final velocities of the body and the time to reach it is 20 s, ask how much the acceleration is worth
Let's use the relationship
v = v₀ + a t
a = [tex]\frac{v-v_o}{t}[/tex]
a = [tex]\frac{17500-10000}{20}[/tex]
a = 375 m/s²
2. What is the time it takes to travel a distance of 125 m with an acceleration of 4 m / s²
x = v₀ t + ½ a t²
As it leaves the direction its initial velocity is zero
x = ½ to t²
t = [tex]\sqrt{\frac{2x}{a} }[/tex]
t = [tex]\sqrt{\frac{2 \ 125}{4} }[/tex]
t = 62.5 s
3. A pencil falls from a height and reaches the floor in a time of 1.5 s what is the speed when reaching the floor
v = v₀ - g t
As it is released its initial velocity is zero
v = -g t
v = - 9.8 1.5
v = -14.7 m / s
The negative sign indicates that the velocity is directed downwards.
4. From the edge of a cliff 40 m high, an apple is thrown downward with an initial velocity of 15 m / s. How long does it take to get to the bottom?
y = y₀ + v₀ t - ½ g t²
In this case the initial velocity is negative because it is directed downwards and when it reaches the floor its height is zero, let us substitute
Suppose the acceleration is g = 10 m / s²
0 = 40 - 15 t - ½ 10 t²
0 = 40 - 15 t - 5 t²
let's solve the quadratic equation
t² + 3 t - 8 = 0
t = -3 + Ts 9 + 4 8/2
t = -3 + 6. 4/2
t₁ = - 4.9 s
t₂ = 1.7 s
The time must be a positive quantity, so the correct answer is 1.7 s
5. A stone is dropped from the ceiling and it takes a time 5 s to reach the floor, which is the height of the ceiling
y = y₀ +v₀ t - ½ g t²
as it is released from the ceiling its initial velocity is zero and the height upon reaching the floor is zero
0 = y₀ + 0 - ½ g t²
y₀ = ½ g t²
y₀ = ½ 9.8 5²
y₀ = 122.5 m
6. A man at a height of 30 m throws a ball downward at 7 m / s
A) The speed when reaching the ground
B) The height of the ball when a time of 1 s has fallen.
A) Let's use the kinematics relation
v² = v₀² - 2 g (y -y₀)
v = 7² - 2 9.8 (0 -30)
v = 25.2 m / s
B) y = y₀ + v₀ t - ½ g t²
y = 30 7 1 - ½ 9.8 1²
y = 18.1 m
7. A watermelon is dropped from rest from the top of a 20m cliff.
A) time in the air
B) ground speed
A) Let's use the relation
y = y₀ + v₀ t - ½ g t²
It is released its initial velocity is zero and when it reaches the ground its height is zero (y = 0)
0 = y₀ + 0 - ½ g t²
t = [tex]\sqrt{\frac{2y_o}{g} }[/tex]
t = [tex]\sqrt{\frac{2 \ 20}{9.8} }[/tex]
t = 2 s
B) the speed when reaching the ground
v = v₀ - g t
v = 0 - 9.8 2
v = - 19.6 m / s
The negative sign indicates that the speed is down
In conclusion using the kinematic relations we can find the results for the different questions are:
1. The acceleraations is a = 375 m/s²
2. The time is t = 62.5 s
3. The velocity at the ground is v = -14.7 m / s
4. The time to the bottoncliff is 1.7 s
5. The height isy₀ = 122.5 m
6.
A) The velocity is v = 25.2 m / s
B) The height for t=1 s is y = 18.1 m
7)
A) Time in the air is t = 2 s
B) Te final veloicty is v = - 19.6 m / s
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Sue and Jenny kick a soccer ball at exactly the same time. Sue’s foot exerts a force of 68.9 N to the north. Jenny’s foot exerts a force of 85.4 N to the east.
a) What is the magnitude of the resultant force on the ball?
Answer in units of N.
Explanation:
the magnitude of the resultant force =
√(68.9² + 85.4²)
=√(4,747.21 + 7,293.16)
=√12,040.37
= 109.7 N
»Sue's style feet (north) = 68.9N
»Jenny style feet (East) = 85.4N
So, the resultant force on the ball is
= √(68.9² + 85.4²)
= √(4,747.21 + 7,293.16)
= √(12,040.37)
≈ 109.72N✅
~Physics#2
It's Friday night and Skyler has been assigned the noble task of baby-sitting Casey, his 2-year old brother. He puts a crash helmet on Casey, places him in the red wagon and takes him on a stroll through the neighborhood. As Skyler starts across the street, he exerts a 52 N forward force on the wagon. There is a 24 N resistance force and the wagon and Casey have a combined weight of 304 N. Construct a free body diagram depicting the types of forces acting upon the wagon. Then determine the net force, mass and acceleration of the wagon.
Answer: It's Friday night and Skyler has been assigned the noble task of baby-sitting Casey, his 2-year old brother. He puts a crash helmet on Casey, places him in the red wagon and takes him on a stroll through the neighborhood. As Skyler starts across the street, he exerts a 52 N forward force on the wagon. There is a 24 N resistance force and the wagon and Casey have a combined weight of 304 N. Construct a free body diagram depicting the types of forces acting upon the wagon. Then determine the net force, mass and acceleration of the wagon.
Explanation:
When Skyler exerts a force of 52 N on the wagon and there is a 24 N resistance force and the wagon and Casey have a combined weight of 304 N then Net force, mass and acceleration of the wagon will be 305.2 N, 31.02kg and 0.9 m/s² resp.
What is Force ?Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s². There are two types of forces, balanced force and unbalanced force. when net force acting on body is zero then it is called as balanced force and net force on the body is non zero then it is called as unbalanced force. unbalanced force are responsible for the motion of the body.
in this problem, Skyler is applying 52 N force to a wagon, there is resistance of 24N of force. Combined Wight is 304 N is directed downwards. a vector diagram is shown in the figure which gives the Net force.
the resultant force between resistance and applied force
F = 52 - 24 = 28N... means total of 28N of actual force is applied on the wagon in x direction.
There is downward force as weight, hence magnitude of net force acting on the wagon is.
F²(net) = F₁²+F₂² + F₁F₂cosθ
θ = 90, cos 90 = 0
F²(net) = F₁²+F₂²
F²(net) = 28² + 304²
F²(net) = 93200
F (Net) = [tex]\sqrt{93200\\[/tex] = 305.2 N
To get mass and acceleration,
weight W = mg
304 = m*9.8
m = 31.02 kg mass of the wagon is 31.02kg
F = ma
28 = 31.02*a
a = 0.9 m/s²
Acceleration of the wagon is 0.9 m/s². this is forward acceleration.
Hence Net force, mass and acceleration of the wagon is 305.2 N, 31.02kg and 0.9 m/s² resp.
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when the speed of a moving car is doubled, how much more kinetic energy does it have?
Answer: 4 times
Explanation:
KE1 = (1/2)mv^2
KE2 = (1/2)m(2v)^2 or (1/2)m*4v^2
KE2/KE1 = ((1/2)m*4v^2)/((1/2)mv^2) = 4 times
What is the acceleration of a 300. kg sled being pulled with a force of 828 N, if the coefficient of kinetic friction between the sled and the ground is 0.120?
Answer:
The acceleration of the sled is 1.584 m/s².
Explanation:
What is kinect friction force?Friction always occur when two surfaces slide across one another. For example, if we push an object and it starts moving, we can say there's a kinect (dynamic) friction force between that object and the surface under.
Now, let's solve the problem.
First, we've got to write the data down.
[tex]\bullet \quad m=300\,kg\\\\\bullet \quad F=828\,N\\\\\bullet \quad \mu_k=0.120[/tex]
Sketch a picture of the problem and point all forces acting on the sled (see attached).
Apply Newton's Second Law Of Motion:
[tex]F_{net}=m\cdot a[/tex]
Let's set our reference system positive to the right. Above equation becomes:
[tex]F-f_k=m\cdot a[/tex]
where [tex]f_k[/tex] is the kinect friction force.
Looking up free body diagram, we can see support force equals the weight of the sled, so that we can write:
[tex]F-\mu_k\cdot m \cdot g=m \cdot a[/tex]
Solving for a:
[tex]a=\dfrac{F-\mu_k \cdot m \cdot g}{m}[/tex]
Let's take 9.8 m/s² for the acceleration of gravity and plug the data on the equation.
[tex]a=\dfrac{828-(0.120)\cdot 300\cdot(9.8)}{300}[/tex]
[tex]\therefore \boxed{a=1.584\,m/s^2}[/tex]
Conclusion: the acceleration of the sled is 1.584 m/s².
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Friction force
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Brainly Team
What is saturns most distinctive feature?
Answer:rings
Explanation:
Consider two future observatories in space. Observatory X consists of a single 50-meter telescope. Observatory Y is an interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across. Which observatory can detect dimmer stars, and which one can see more detail in its images
The size and aperture of the telescopes determine its ability to gather light
and reveal details.
A) Observatory X can detect dimmer stars and Observatory Y reveals more
details.
Reasons:
The benefits of using several small telescopes included the production
high resolution images of bright objects such as binary stars that reveal
more details similar to a telescope with a very large aperture, with a
process known as interferometry, through which a star's diameter can be
determined.
The benefit of a large telescope is its ability to gather light from a source,
thereby making possible to detect a dim light source, such as dimmer
stars.
Therefore;
The single large telescope in observatory X can detect dimmer stars while
the interferometer consisting of five 10-meter telescopes, spread out over a
region 100 meters across can see more detail in its images.
The correct option is; A) Observatory X can detect dimmer stars and
Observatory Y reveals more details.
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Question options:
A) Observatory X can detect dimmer stars and Observatory Y reveals more
details.
B) Observatory Y can detect dimmer stars and Observatory X reveals more
details.
C) Observatory X both detect dimmer stars and reveals more details
D) Observatory Y both detect dimmer stars and reveals more details
Did anyone have any clue about this question
light waves are first transmitted through the ________ at the front of the eye and enter an opening called the ________ before shining onto the retina.
The transmission of light waves is usually done through cornea of the eyes, then move through another opening which is regarded as pupil before it will get to the retina.
Light waves can be regarded as moving energy which contains microscopic particles known as photons. The vision of the eye can be completed through the light wave passing through the components of the eyes and this process goes thus;Light will move through the (cornea) which is situated at the front area of the eyes into lens. Then both the cornea and the lens give room for the focusing of the light rays to the retina which is situated at the back of the eye .Then through the help of the cells in the retina, the light will be absorbed and then be converted to electrochemical impulses and then transfer it to the brain as well as optic nerve.Therefore, light wave are form of tiny microscopic particles.
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Pedro runs a total of 125 m in a straight line north in 11.5 s. What is his velocity.
What possible scientific applications are there for determining the chemical composition of materials using spectral information?
Answer:
Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths. The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy.
Explanation:
Hope this helps maybe...
will give correct answer brainliest
Answer:
West
Explanation:
This is because the first caar has more mass
If the radio waves that are sent from the speed gun have a frequency of 400,000,002 Hz and the radio waves reflected off an approaching car have a frequency of 400, 000, 10 , what is the speed of the car? (Hz is the SI unit of frequency, equal to cycles per second).
Answer:
fL = fs(V/v-vs) 400000002= 40000010(331/331- vs). then find vs so easy
will give correct answer brainliest
In a trial, an expert witness uses the conservation of momentum to demonstrate which initial velocities would give the final states that occurred in the accident. Can using the conservation of momentum be justified in this case? Yes, because momentum is conserved in all collisions. No, momentum is only conserved in elastic collisions which this is not. No, energy is always conserved, but momentum is only sometimes conserved. Yes, because momentum is conserved in inelastic collisions which all car accidents are.
What type of energy does an oven produce?
Light and Heat
Heat
Light
None of the above
Answer:
The answer is heat
Explanation:
For me, I associate thermal energy with heat energy
What is the net force on charge placed at the center of square of length 1m? All charges have same magnitude of 2 micro coulomb.
Answer:
Electric Field intensity is zero.
The reason for that is:
All charges are placed at equal distances from the center of the square and have same magnitude and sign. This means they will exert equal and opposite forces on the test charge at the center. Net force will become Zero.
A ball is throw vertically upwards with a speed of 20ms,calculate the maximum height reach(g=10)
the apparent backward motion of a planet along the celestial sphere is called:
Answer:
retrograde
Explanation:
here's a pic of a slug
On a pirate map, “X” marks the spot. Does that “X” reference the position or the
displacement of the treasure?
Answer:
it References the position
Explanation:
Displacement is defined to be the change in position of an object.
And the treasure can't move by itself because its an object (and objects don't move).
4. You bought a block of cheddar from the grocery store. If you cut a small piece and a large piece from the same block of cheese, will they have the same density? Why?
the apparent shift of a nearby object against the background of more distant stars is called:
Answer:
Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.
What is the relationship between the variables on this graph?
The temperature does not have an effect on flow rate.
As the temperature increases, the flow rate increases.
As the temperature increases, the flow rate decreases.
Answer:
The answer is A) "As the temperature increases, the flow rate decreases."
Para estudiantes de Español:
La respuesta es A) "A medida que aumenta la temperatura, el cuadal disminuye."
Explanation:
This is correct. I took the test!
Este es correcta! Tomé la prueba!
Answer: As the temperature increases, the flow rate decreases.
Explanation:
If y = ab, then find the maximum percentage error in the measurement of y.
Answer:
(Δa/a +Δb/b) × 100
Explanation:
Y= a/b
So, maximum percentage error
Δy/y = ( Δa/a + Δ b/b) × 100
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