The arrow's speed after 3 seconds is approximately 43.091 m/s.
The horizontal and vertical components of the velocity can be determined using trigonometry. The initial vertical velocity is given by v₀y = v₀ sin θ, and the horizontal velocity is given by v₀x = v₀ cos θ.
Given, θ = 30°, v₀ = 20 m/s, t = 3 s. The acceleration of gravity is g = 9.81 m/s².Let's now use the kinematic equation vf = v₀ + at. Since the arrow is launched at an angle above the horizontal, we need to calculate the horizontal and vertical components of the velocity.
The initial vertical velocity of the arrow is:
v₀y = v₀ sin θ= (20 m/s) sin 30°= 10 m/s
The horizontal velocity of the arrow is:
v₀x = v₀ cos θ= (20 m/s) cos 30°= 17.3205 m/s
Using the kinematic equation vf = v₀ + at, we can calculate the vertical velocity of the arrow after 3 seconds:
vfy = v₀y + gt
= (10 m/s) + (9.81 m/s²)(3 s)
= 39.43 m/s
The horizontal velocity doesn't change during the flight of the arrow, so vf = v₀x = 17.3205 m/s.
The final velocity of the arrow is given by the vector sum of the horizontal and vertical velocities:
v = √(vf² + v₀x²)
= √(39.43² + 17.3205²)
= 43.091 m/s
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In a complete description of a force vector, which is usually not necessary?
Answer:
Position
Explanation:
A force vector has both magnitude and direction, which can be represented by a line with an arrow head. The length of the line describes magnitude, while the arrows points in the required direction.
generally, the position of a vector is unimportant when describing the vector. Thus, when a force vector is to be described, it is unnecessary to make reference to its original position. Majorly, its magnitude and direction is considered.
which part of the central nervous system controls reflexes?
a. cerebrum
b. cerebellum
c. brain
d. spinal cord
Answer:
spinal cord becuse it does all of the reflexes
Answer:
none of these
Explanation:
what actually controlls reflexes is the brain stem
PLEASE HELP ME WILL GIVE BRAINLIEST
The horizontal and vertical components of a projectile's velocity are......
A. always changing
B. independent of each other
C. dependent on each other
D. always equal
Answer:
A.always changing
Explanation:
Answer:
always equal
The horizontal and vertical components of a projectile's velocity is always equal. The horizontal and vertical have different charges.
if Sarah melts 10g of tin. What mass of melted tin would she have at the end of the experiment?
Answer:
10g
Explanation:
As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".
Though melting of tin isn't a chemical change, the same logic is applied here...
Hence,
The mass of tin will be 10 g itself...
Answer:
10g
Explanation:
The experiment is about melting of tin. When solid tin is melted, it retains the amount of substance it originally has and we expect it to still be 10g.
Mass is the quantity or amount of matter contained in a substance. For most chemical processes, the law of conservation of matter is always succinctly observed.
The law states that "matter is neither created nor destroyed in a chemical reaction or process". Although melting is a phase change, we can adapt this law to the process. Owning to no loss of matter in the melting procedure, the amount of substance remains the same.
Therefore, we are left with about the same mass of substance we started with which is 10g.
The point on the graph that lies on the y-axis (vertical axis) is called the y-intercept. What does the y-intercept tell you about the runner? ( look at photo)
the ending position of the runner
Choices:
the runners distance from the state
the starting position of the runner
the runners speed
Answer:
The starting position of the runner.
Explanation:
When you look at the graph, you can see that the first point on the graph is twenty on the y-axis.
The runner starts at twenty, and ends at thirty.
Therefore, the runner starts at twenty on the y-axis, so it's the starting position of the runner.
The y-intercept tell you about the starting position of the runner.
What is y-intercept of a function?The intersection of the graph of the function with the y-axis gives y-intercept of that function. The y-intercept is the value of y on the y-axis at which the considered function intersects it.
Assume that we've got: y = f(x)
At y-axis, we've got x = 0, so putting it will give us the y-intercept.
Thus, y-intercept of y = f(x) is y = f(0)
When we look at the graph, we can see that the first point on the graph is twenty on the y-axis.
The runner starts at twenty and ends at thirty.
Thus, the runner starts at twenty on the y-axis, so it is the starting position of the runner.
The y-intercept tell you about the starting position of the runner.
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The temperature of a sample of iron with a mass of 10.0 g changed
from 50.4°C to 25.0°C with the release of 114.3 J of heat. What is the
specific heat of iron
Answer:
Q = mc(θ₂-θ₁)
47 calories = 10 g *c*(50.4 - 25)
47cal = 10*c* 25.4
47 /(10*25.4) = c
0.185 = c
Specific heat of iron = 0.185 cal/g°C
Explanation:
Silvia rides her bike 2.7km to school. After school, she rides an additional 1.3 km to the mall in the opposite direction. What is her total distance traveled?
Answer:
4.0 km
Explanation:
Total distance traveled doesn't care about direction:
Total distance traveled = 2.7km + 1.3 km = 4.0 km
What is the momentum of a baseball with a mass of 4 kg being thrown at a velocity of 84 m/s towards the hitter
Answer:
The answer is 336 kgm/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocityFrom the question
mass = 4 kg
velocity = 84 m/s
We have
momentum = 4 × 84
We have the final answer as
336 kgm/sHope this helps you
a body at rest in one reference frame may be in motion in another reference frame what does it mean?
Answer:
Explanation:
Suppose you are standing on a platform connected to a train station. You appear to be at rest to a third person looking at you from the parking lot.
But what happens if you are observed by someone in the dining car of the train that just passed you?
You appear to be moving. He can prove it because your relative size is getting smaller. How does he know that it is he that is moving and that you are standing still? If he has no idea what's going on with his motion, he also has no idea who is moving.
During an ,
experiment, a siginal from a spaceship
reached the ground station in five minutes. What was the
distance of
the spaceship from
the ground station? The
signal travels at the speed of light, that is 3x 109 ms‐1
Answer:
1.5*10^9
Explanation:
distance =V x T
=3x10^8x5
=1.5*10^9
what is the properties of polarization
Answer:
Explanation:
The polarization characteristics depend on the shape, size, and optical properties of the surface particles. Generally, the radiation is linearly polarized and is said to be negatively polarized if it lies in the scattering plane and positively polarized if it is perpendicular to the scattering plane.
Processes such as dissolving, melting, freezing, and evaporationg can affect the appearance of a substance, but the identity of the substance remains the same. These processes are called
A. physical properties
B. chemical change
C. chemical process
D. physical change
which statement is an example of the law of conservation of energy
Answer:
The law of conservation of energy can be seen in these everyday examples of energy transference: Water can produce electricity. Water falls from the sky, converting potential energy to kinetic energy. This energy is then used to rotate the turbine of a generator to produce electricity.
Explanation:
Answer:
When a light bulb is turned on, electrical energy is converted to light and heat.
Explanation:
got it right :)
A handball is hit toward a wall with a velocity of 14.3 m/s in the forward direction. It returns with a velocity of 13.5 m/s in the backward direction. If the time interval during which the ball is accelerated is 0.011 s, what is the handball's average acceleration?
Answer:
Let's define t = 0 as the moment when the ball hits the wall.
in this moment, we have a given acceleration, but if we only want to calculate the average acceleration, then let's consider the acceleration constant.
a(t) = A.
To find the velocity equation we should integrate, and the constant of integration will be the initial velocity, in this case, is 14.3m/s.
v(t) = A*t + 14.3m/s
Now we know that at t = 0.011s, the velocity is -13.5m/s (the sign is negative because the ball is moving in the opposite direction as before).
Then we can solve the equation:
v(0.011s) = -13.5m/s = A*0.011s + 14.3m/s
Now we can solve it for A, the average acceleration:
-13.5m/s - 14.3m/s = A*0.011s
(-27.8m/s)/0.011s = A = -1313.5 m/s^2
difference between
Atmospheric pressure and Liquid pressure.
Answer:
one is Atmospheric and one is a Liquid
Explanation:
please help me with this question asap
12. A train is traveling away from you at a constant speed.
What would a distance-time graph look like for this train?
Answer:
b
Explanation:because think about it its going straight so you have to coiunt the miles the train is going and boom your answer is b
Answer:
It would be choice b
Explanation:
speed is constant so they value won't change, on the other hand time is always going.
A 100 kg steel beam is being lifted by a crane to the top of 15 meter building. How much Potential Energy is in the steel be a m when it reaches the top of the building.
Use the information below to solve this problem: A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters. Question 2 options: 0.6945 m 0.7204 m 1.439 m 343 m
Answer:
Option (1). 0.6945 m
Explanation:
Frequency of a B note = 493.88 Hz
Speed of sound in the air = 343 meters per second
Since, formula to calculate the wavelength of a note is,
λ = [tex]\frac{v}{f}[/tex]
By substituting the given values in the formula,
λ = [tex]\frac{343}{493.88}[/tex]
λ = 0.6945 m
Therefore, wavelength of the music note is 0.6945 m.
Option (1) will be the answer.
HELPPPP!!!!!
The air we breathe is a(n) _____.
A. compound
B. mixture
C. element
D. alloy
PLEASE HURRY AND HELP
What is the correct unit for acceleration?
A. m
B. m/s
C. m/s2
An object moves in a straight path. Its position x as a function of time t is presented by the equation x(t) = at – bt2+c, where a = 1.4 m/s, b = 0.06 m/s2 and c =50 m. a. Calculate the average velocity of the object for the time interval t = 0 to t = 5 s b. Calculate the average velocity of the object for the time interval t = 0 to t = 10 s c. Calculate the average velocity of the object for the time interval t = 10 to t = 15 s
Answer:
The answer is below
Explanation:
Given that:
x(t) = at – bt2+c
a) x(t) = at – bt2+c
Substituting a = 1.4 m/s, b = 0.06 m/s2 and c =50 m gives:
x(t) = 1.4t - 0.06t² + 50
At t = 5, x(5) = 1.4(5) - 0.06(5)² + 50 = 55.5 m
At t = 0, x(0) = 1.4(0) - 0.06(0)² + 50 = 50 m
The average velocity (v) is given as:
[tex]v=\frac{x(5)-x(0)}{5-0}\\ \\v=\frac{55.5-50}{5-0}=1.1\\ \\v=1.1\ m/s[/tex]
b) x(t) = 1.4t - 0.06t² + 50
At t = 10, x(10) = 1.4(10) - 0.06(10)² + 50 = 58 m
At t = 0, x(0) = 1.4(0) - 0.06(0)² + 50 = 50 m
The average velocity (v) is given as:
[tex]v=\frac{x(10)-x(0)}{10-0}\\ \\v=\frac{58-50}{10-0}=0.8\\ \\v=0.8\ m/s[/tex]
c) x(t) = 1.4t - 0.06t² + 50
At t = 15, x(5) = 1.4(15) - 0.06(15)² + 50 = 57.5 m
At t = 10, x(10) = 1.4(10) - 0.06(10)² + 50 = 58 m
The average velocity (v) is given as:
[tex]v=\frac{x(15)-x(10)}{15-10}\\ \\v=\frac{57.5-58}{15-10}=0.1\\ \\v=0.1\ m/s[/tex]
What is the force that causes you t land on the floor when you fall out of bed?
Answer: gravity.
Explanation:
Answer:gravity
Explanation:
as a car skids to a stop, friction transforms kinetic energy to
Answer:
potential energy
Explanation:
please help!!
There are more electrons in the orbitals of an atom that there are protons in the nucleus of the atom true or false
Answer:
An element is a pure substance that contains only one type of atom. TRUE. 2. ... FALSE, they are all carbon atoms. 7. The smallest unit of matter is an atom. TRUE. 8. When an ... TRUE. 10. Most of the mass of an atom is found in the electron layers. FALSE. 11. The nucleus of an atom contains protons and neutrons. TRUE ...
Explanation:
PLEASE HELP!!!!! 30 POINTS!!!!! I HAVE NO IDEA HOW TO DO THIS!!
Match these items and the phrases with which they are associated.
1. upward force of a liquid on an object
2. H 2 O
3. basic unit of matter
4. amount of matter in an object
5. n = 1
6. l × w × h
7. drew first picture of atom
8. mass/volume
mass,
atom,
water,
buoyancy,
inner shell,
volume,
density,
Neils Bohr,
concrete
State Newton’s first law of motion in your own words.
Answer:
An object in motion will stay in motion until an outside force is acted upon it.An object at rest will stay at rest until an outside force acts upon it.
Explanation:
Answer:
An object in motion will stay in motion until an outside force is acted upon it. An object at rest will stay at rest until an outside force acts upon it.
Explanation:
I really need help with this question, I can't wrap my brain around this.
region 4: warm, low pressure air
region 1: higher pressure air fills vacancy from low pressure air
region 3; cool high pressure air
region 2: warm air cools and increases in pressure.
Two swimmers relax close together on air mattresses in a pool. One swimmer’s mass is 48 kg, and the other’s mass is 55 kg. If the swimmers push away from each other,
A. their total momentum triples.
B. their momentums are equal but opposite.
C. their total momentum doubles.
D. their total momentum decreases.
In the case when the swimmer push away so the momentum should be equal but it should be opposite.
What is momentum?Momentum means the product of the mass of a particle and its velocity. It is a vector quantity, it applied to both magnitude and direction. Since the swimmers are push away so here the momentum should be equal but it should be an inverse direction, not the direct direction.
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x = 20
v = 3.5 m/s
t = ?
Answer:
16.5 I think
Explanation:
