Answer:
Explanation:
Use the one-dimensional equation
Δx = [tex]v_0t+\frac{1}{2}at^2[/tex] where delta x is the displacement of the object, v0 is the velocity of the object, a is the pull of gravity, and t is the time in seconds. That's our unknown.
Δx = -2 (negative because where it ends up is lower than the point at which it started),
[tex]v_0=5[/tex], and
a = -9.8
Filling in:
[tex]-2=5t+\frac{1}{2}(-9.8) t^2[/tex] and simplified a bit:
[tex]-2=5t-4.9 t^2[/tex]
this should look hauntingly familiar (a quadratic, which is parabolic motion...very important in physics!!). We begin by getting everything on one side of the equals sign and solving for t by factoring:
[tex]-4.9 t^2+5t+2=0[/tex] (the 0 is also indicative of the object landing on the ground! Isn't this a beautiful thing, how it all just works so perfectly together?)
When you factor this however your math/physics teacher has you factoring you will get that
t = 1.3 sec and t = -.31 sec
Since we all know that time can NEVER be negative, it takes the ball 1.3 sec to hit the ground from a height of 2 m if it is rolling off the shelf at 5 m/s.
A car is traveling at a constant speed of 33 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two cars meet for the first time at the next exit, which is 2.5 km away
Answer:
0.8712 m/s²
Explanation:
We are given;
Velocity of first car; v1 = 33 m/s
Distance; d = 2.5 km = 2500 m
Acceleration of first car; a1 = 0 m/s² (constant acceleration)
Velocity of second car; v2 = 0 m/s (since the second car starts from rest)
From Newton's equation of motion, we know that;
d = ut + ½at²
Thus,for first car, we have;
d = v1•t + ½(a1)t²
Plugging in the relevant values, we have;
d = 33t + 0
d = 33t
For second car, we have;
d = v2•t + ½(a2)•t²
Plugging in the relevant values, we have;
d = 0 + ½(a2)t²
d = ½(a2)t²
Since they meet at the next exit, then;
33t = ½(a2)t²
simplifying to get;
33 = ½(a2)t
Now, we also know that;
t = distance/speed = d/v1 = 2500/33
Thus;
33 = ½ × (a2) × (2500/33)
Rearranging, we have;
a2 = (33 × 33 × 2)/2500
a2 = 0.8712 m/s²
How does image differ from shadow?
Answer:
Image is formed by the reflection of light rays by an object. Image has the colour of the object. ... Shadow is formed by the obstruction of light by an opaque object. Shadow is always black.
Image is formed by the reflection of light rays by an object. Image has the colour of the object.
Shadow is formed by the obstruction of light by an opaque object. Shadow is always black.
A good-quality measuring tape can be off by 0.58 cm over a distance of 22 m. What is its percent uncertainty
Answer:
22 m = 2200 cm
.58 / 2200 = .00026 = .026 %
Percent error = +_ .026
whats this spell? cause i have no clue
This is trying to show you that if you know the rules of the code, you can figure out the whole message from only having a part of it.
In this picture, the rules of the code are how the letters are formed.
This is an important concept for communication. It's related to the questions of
. . . Can you understand a person on the phone if there's also static or noise mixed with his voice ?
. . . Can you accurately decode a digital message made of 1's and zeroes, even if some of them are missing, or got reversed on the way to you ?
The answer to both of these questions is 'Yes, you can. If you have ENOUGH of the message, you can fill in the missing parts.'.
In this case, I hate to say it, but I don't think the question gives us enough of the message for us to be able to fill in the missing part. Maybe some people can look at this and understand what it says, but I can't.
To show you a better example of how you can fill in the whole message when part of it is missing, I made my own, and it's attached to this answer.
true or False? PLEASE HELP ME
Answer:
a. True - Joules is the unit measure for energy.
b. False - Potential energy is associated with position
c. False - Kinetic energy is associated with movement.
d. False - It's climbing, which means it also has kinetic energy.
Which three gasses that contribute most to Climate Change?
ans) 1.Green House gasses 2. carbon dioxide 3.nitrious gases
Answer:
Water vapor.
Carbon dioxide.
Methane.
Ozone.
Nitrous oxide.
Chlorofluorocarbons.
Explanation:
thank me later
Look at the graph and extrapolate how many baskets were made by the team at 8.5 minutes.
A.
3
B.
1
C.
23
D.
24
a 4 kg block of iron weighs about
a.) 4 N
b.) 40 N
c.) 0.4 N
d.) more than 400 N
Answer:
40 N
Explanation:
[tex]w = mg \\ w = 4 \times 9.81 \\ w = 39.24 = 40 \: [/tex]
A trumpet player hears 5 beats per second when she plays a note and simultaneously sounds a 440 Hz tuning fork. After pulling her tuning valve out to slightly increase the length of her trumpet, she hears 3 beats per second against the tuning fork. Was her initial frequency 435 Hz or 445 Hz? Explain.
Answer:
her initial frequency is 445 Hz
Explanation:
Given;
initial beat frequency, [tex]F_B[/tex] = 5
observed frequency, F = 440 Hz
let the initial frequency = F₁
F₁ = F ± 5 Hz
F₁ = 440 Hz ± 5 Hz
F₁ = 435 or 445 Hz
This result obtained shows that her initial frequency can either be 435 Hz or 445 Hz
The last beat frequency will be used to determine the actual initial frequency.
F = v/λ
Frequency (F) is inversely proportional to wavelength. That is an increase in length will cause a proportional decrease in frequency.
This shows that the final frequency is smaller than the initial frequency because of the increase in length.
Initial frequency - frequency of tuning fork = 5 beat frequency
Reduced initial frequency - frequency of tuning fork = 3 beat frequency
Initial frequency = 5Hz + 440 Hz = 445 Hz
Final frequency (Reduced initial frequency) = 440 + 3 = 443 Hz
Check: 445 Hz - 440 Hz = 5 Hz
443 Hz - 440 Hz = 3 Hz
What do the planets Saturn, Neptune, and Uranus have in common?
A. They are all smaller than Earth.
B. They are the closest to the Sun.
C. They are all outer planets.
D. They are all inner planets.
Answer:
they are all outer planets
Calculate the mass of earth
earth assum
assuming
that it i a
6.67x106m.
Sphere with radius
Answer:
[tex]m=6.85\times 10^{24}\ kg[/tex]
Explanation:
The radius of Earth is [tex]6.67\times 10^6\ m[/tex]
The density of an object is given by :
[tex]d=\dfrac{m}{V}[/tex]
The density of Erth is, d = 5515 kg/m³
Where
m is the mass of the Earth
So,
[tex]m=d\times V\\\\m=\dfrac{4}{3}\pi r^3\times d[/tex]
Put all the values,
[tex]m=\dfrac{4}{3}\pi \times (6.67\times 10^6)^3\times 5515 \\\\m=6.85\times 10^{24}\ kg[/tex]
So, the mass of the Earth is equal to [tex]6.85\times 10^{24}\ kg[/tex].
If the torque on an object adds up to zero Group of answer choices the object is at rest. the object cannot be turning. the object could be accelerating linearly but it could not be turning. the forces on it also add up to zero. the object could be both turning and accelerating linearly.
Answer:
the body has linear acceleration, but cannot rotate
Explanation:
Let's analyze the system
If the torque is zero, the two forces are the same magnitude, but applied to each side of the body in such a way that the torque cancels the punch of the other. Therefore the body cannot turn
The two forces go in the same direction so the object can have linear acceleration
The object is at rest because it has a force in the same direction, but in the opposite direction.
therefore the correct answer is:
the body has linear acceleration, but cannot rotate
A car starting from rest has a constant acceleration of 4 meters per second per second. How fast will it be going in 5 seconds?
Answer:
18 m
Explanation:
Given : vo = 0 m/s ; t = 3 s; a = 4 m/s^2 ; d = ? m ; average velocity = ? m/s ; fonal velocity = ? m/s
solving for the final velocity, v
v = a * t
v = 4 m/s^2 * 3 s
v = 12 m / s
Solving for the average velocity. avg v
avg v = (vo + v) / 2
avg v = (0 m / s + 12 m/s) / 2
avg v = 6 m / s
Solving for the distance traveled after 3 s
d = avg v * t
d = 6 m / s * 3 s
d = 18 meters
In the first 3s the car travels 18 meters.
If a car starting from rest has a constant acceleration of 4 meters per second per second, then it would be going at a speed of 20 m / s.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2 × a × t²
v² - u² = 2 × a × s
As given in the problem, a car starting from rest has a constant acceleration of 4 meters per second per second,
By using the first equation of the motion,
v = u + at
v = 0 + 4 × 5
v = 20 m / s
Thus,If a car starting from rest has a constant acceleration of 4 meters per second per second, then it would be going at a speed of 20 m / s.
To learn more about equations of motion here, refer to the link given below ;
brainly.com/question/5955789
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What is one reason why humans cannot live on the planet Jupiter?
A. The gravity is too strong
B. All are reasons why people cannot live on Jupiter
C. The surface is hotter there than the Earth
D. The planet is too rocky
B all are reasons why people cannot live in jupiter
Question 23 of 33 Which phrase best describes when kinetic friction occurs? A. When two surfaces are moving relative to each other B. When one object is resting on another C. When two surfaces are in contact but not moving relative to eatn other D. When balanced forces are acting on an object
Answer:
A. When two surfaces are moving relative to each other.
Explanation:
It is also know as dynamic friction
A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is Group of answer choices Zero down the hill and greater than the weight of the car. down the hill and equal to the weight of the car up the hill and equal to the weight of the car. up the hill and greater than the weight of the car.
Answer:
Zero
Explanation:
Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.
Mathematically, net force is given by the formula;
[tex] Fnet = Fapp + Fg[/tex]
Where;
Fnet is the net force.
Fapp is the applied force.
Fg is the force due to gravitation.
In this scenario, a stalled car is being pushed up a hill at constant velocity by three people. Thus, the net force on the car is zero because all the forces acting on any physical object is equal to zero and represents a constant velocity; by balancing or cancelling each other out.
According to Sir Isaac Newton's First Law of Motion which is known as Law of Inertia, it states that an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
Atoms of elements in the same group have the same
Explanation:
The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
What are possible units for impulse? Check all that apply.
▪️kg•m
▪️kg• m/s
▪️N•s
▪️N•m
▪️N•m/s
Answer:
kg.m/s
Explanation:
it is a division of a mass and a speed
which wave characteristic is the same for all electromagnetic waves traveling through a vacuum?
Answer:
All waves travel at the same speed c.
What do different forms of energy have in common?
A. They can push or pull on objects.
B. They give objects mass.
C. They can cause changes in matter.
D. They can cause objects to move.
Answer:
C because it changes your energy
(a) Which force is involved in kicking a ball?
i. frictional force
ii.gravity
iii. pushing force
iv. centrifugal force
What is the voltage drop across the 10.0 alpha resistor
Answer:
wow so cool the answer is vr 10
Match each date to the correct description.
1. autumnal equinox
June 21
2. vernal equinox
September 22
3. longest day in Northern Hemisphere
December 22
4. longest day in Southern Hemisphere
March 21
June 21: longest day in Northern Hemisphere
December 22: longest day in Southern Hemisphere
September 22: autumnal equinox
march 21: vernal equinox
Answer:
Autumnal Equinox: September 22nd
Vernal Equinox: March 21st
Longest day in the Northern Hemisphere: June 21st
Longest day in the Southern Hemisphere: December 22nd
Explanation:
I hope this helps! <3
State the relation between acceleration and momentum
Answer:
Acceleration is the rate of change of velocity. Momentum is the mass times the velocity. So if you multiply the mass times the acceleration, you get the rate of change of momentum
WILL GIVE 50 POINTS
Three resistors of 100, 40.0, and
10.0 Ohms are in series with a
24.0 V power supply. What is the
voltage drop across the 40.0 Ohm
resistor?
Answer:
6.4
Explanation:
stole the answer from Chegg and it was right on Acellus
Answer:
Explanation:
did he just say "don't break an arm wanking yourself off!??"
lol funny little comment section not gonna lie
when a car climbs a hill, it only has potential energy
True or false
t
Explanation:
true , a car climbs a hill, it only has potential energy
Answer:
As the car begins to roll down the hill, it loses potential energy, but gains kinetic energy. The potential energy of the position of the car at the top of the hill is getting converted into kinetic energy. Where "g" is the standard acceleration of gravity which equals 9.8 m/s2.
Explanation:
Động cơ khởi động của một ô tô bị quay chậm , thợ cơ khí quyết định phải thay động cơ , dây cap hoặc acquy. Hướng dẫn sử dụng nói rằng acquy 12v phải có điện trở 0.002 ( ôm) , động cơ có điện trở không quá 0.2 (ôm) và dây cáp có điện trở không quá 0.04 ( ôm) , thợ cơ khí cho động cơ chạy đo được là 11,4v trên acquy , 3v trên cáp và dòng bằng 50 A , vậy phần nào bị hỏng ?
Answer:
Việc nắm được các thông số của bình ắc quy cho xe máy sẽ giúp bạn ... Khi di chuyển với tốc độ chậm hoặc gặp phải tắc đường, đối với xe có ... sau: ắc quy có điện áp 12V, CCA = 600, có nghĩa là ắc quy có thể cung cấp
Explanation:
Research indicates that genetics does not influence levels of aggression.
Please select the best answer from the choices provided
True or
False
Answer:
False
Explanation:
Took the test and got a 100%
The statement " Research indicates that genetics does not influence levels of aggression." is False.
What is genetics?Genetics is the branch of biology that studies genes, heredity, and genetic variation in living organisms. It involves the study of how traits and characteristics are passed down from one generation to another through the genetic material, such as DNA, that is contained in the chromosomes of cells. Genetics plays a crucial role in understanding the development, growth, and functioning of organisms, as well as the causes and treatment of genetic diseases.
Here in the Question,
The statement that "genetics does not influence levels of aggression" is not entirely accurate. While there is no single gene that determines aggressive behavior, research has shown that genetics can play a role in influencing aggression.
Studies have found that certain genes are associated with increased risk for aggressive behavior, including those involved in the regulation of neurotransmitters such as serotonin and dopamine, which are known to affect mood and behavior. Additionally, environmental factors can interact with genetic factors to increase or decrease the expression of genes that influence aggression.
So, it is important to note that genetics is not the sole determinant of aggression. Environmental factors, such as childhood experiences, exposure to violence, and social and cultural influences, also play a significant role in shaping behavior.
Therefore, it is more accurate to say that aggression is a complex interplay between genetic and environmental factors.
To learn more about genes click:
https://brainly.com/question/29762819
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If U= <4, -6> and V= <-3, 8> Find U+V
Answer:
[tex]\langle 1,\, 2\rangle[/tex].
Explanation:
Both [tex]U[/tex] and [tex]V[/tex] are two-dimensional vectors. In other words, each of them has two components. Each component is a number.
When adding two vectors, add each component separately. The sum should include the same number of components as the vectors that are being added.
Since [tex]U[/tex] and [tex]V[/tex] has two components each, their sum, [tex](U + V)[/tex], would also include two components.
Sum the first components of [tex]U[/tex] and [tex]V[/tex] to find the first component of [tex](U + V)[/tex]: [tex]4 + (-3) = 1[/tex].
Similarly, sum the second components of [tex]U[/tex] and [tex]V[/tex] to find the second component of [tex](U + V)[/tex]: [tex]-6 + 8 = 2[/tex].
Hence, [tex](U + V) = \langle 1,\, 2 \rangle[/tex].
A hovering mosquito is hit by a raindrop that is 45 times as massive and falling at 8.2 m/s , a typical raindrop speed. How fast is the raindrop, with the attached mosquito, falling immediately afterward if the collision is perfectly inelastic
Answer:
The speed of the raindrop and the mosquito is 8.02 m/s.
Explanation:
mass of mosquito = m
mass of drop = 45 m
initial velocity of mosquito, u = 0 m/s
initial velocity of drop, u' = 8.2 m/s
During the inelastic collision, the momentum of the system is conserved.
Let the speed of rain drop and the mosquito is v.
Use the conservation of momentum
m x u + 45 m x u' = (m + 45 m) v
m x 0 + 45 m x 8.2 = 46 m x v
v = 8.02 m/s