would someone just answer this now?
Answer:
x=36.5 m
Explanation:
Rectangular Components of a Vector
A vector can be expressed as an ordered pair (x,y) where x is the x-coordinate, and y is the y-coordinate of a rectangular system.
It can also be given as a magnitude-angle pair (r,θ) where θ is measured from the positive x-axis. It's also known as polar coordinates.
The conversion from polar to rectangular coordinates is:
[tex]x=r\cos \theta[/tex]
[tex]y=r\sin\theta[/tex]
We are given the vector as a magnitude r=47.3 m and at an angle θ=39.4°. The x-component of the vector is:
[tex]x=47.3\cos (39.4^\circ)[/tex]
Using a scientific calculator to find the trigonometric function:
[tex]x=47.3\cdot 0.7716[/tex]
x=36.5 m
A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of Earth. At its maximum height, the speed of the ball is
Answer:
0 m/s
Explanation:
In this problem,
A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of Earth. We need to find the speed of the ball at the maximum height. When an object reaches its maximum height, after then it starts to decrease its speed. As a result, the speed of the ball will be equal to 0 m/s.
The speed of the ball thrown upwards is zero when the object reaches maximum height.
The given parameter:
maximum height, h = 30 mThe velocity of an object thrown upwards decreases with time because the object is moving against gravity, and the eventually becomes zero when the object reaches maximum height.
[tex]v_f = v_0 - gt= 0[/tex]
Thus, the speed of the ball thrown upwards is zero when the object reaches maximum height.
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Select the correct answer
All of the following will help you safely cool foods EXCEPT:
A After a meal put leftovers in a deep container so the food cools down more slowly.
B Put cold foods away immediately after purchasing.
c.
Nestle a bowl of cold food in a slightly larger bowl of ice during a picnic.
D. Transfer cold foods directly from the refrigerator to the cooler when going out.
If someone knows this answer please help me
Answer:
I may be a little late, but it's A i got it right on the exam
Explanation:
All of the following will help you safely cool foods except after a meal put leftovers in a deep container so the food cools down more slowly, therefore the correct answer is option A.
What is thermal energy?
It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
The option that will help you safely cool foods is by putting cold foods away immediately after purchasing, Nestle a bowl of cold food in a slightly larger bowl of ice during a picnic, and Transferring cold foods directly from the refrigerator to the cooler when going out.
The right response is A, option a since all of the options will help you safely cool meals, with the exception of putting leftovers in a deep container after a meal to allow them to cool more slowly.
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A boxer hits a punching bag and gives it a change in momentum of 12 kg multiplied by m divided by s over 7.0ms what is the magnitude of the net force on the punching bag
Answer:
1714N
Explanation:
The change in momentum of an object is the product of mass and the change in velocity
The magnitude of the netforce can be calculated using 12kg/7.0ms
But we can convert 7ms to "s" = 7× 10^-3s
F= Force = 12/7×10^-3= 1714N
Hence, the magnitude of the net force on the punching bag is 1714N
What is the common property of the elements pinctogen
Answer:
The pnictogens consist of two non-metals, two metalloids, one metal, and one element with unknown chemical properties. All the elements in the group are solids at room temperature, except for nitrogen which is gaseous at room temperature.
How does a battery supply electrical energy to a circuit?
A. Chemical reactions in a battery cause positively and negatively
charged particles to separate and become concentrated at the
battery terminals.
B. Chemical reactions in a battery cause positively and negatively
charged particles to concentrate in the center of the battery.
C. The force of attraction between positively and negatively charged
particles generates electrical energy within the battery.
O
D. Negatively charged particles that are concentrated at the negative
terminal are repelled from one another, forcing them into a
conducting wire.
ko
Answer: A.
Explanation:
took the test just now
A battery supplies electrical energy to a circuit Chemical reactions in a battery cause positively and negatively charged particles to separate and become concentrated at the battery terminals. The correct option is A.
What is a chemical reaction?A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products
Chemical reactions in a battery cause positively and negatively charged particles to separate and become concentrated at the battery terminals resulting in the transformation into electrical energy therefore the correct option is A.
Learn more about chemical reactions
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What, exactly, is moving across the medium?
Answer:
So waves are everywhere. But what makes a wave a wave? What characteristics, properties, or behaviors are shared by the phenomena that we typically characterize as being a wave? How can waves be described in a manner that allows us to understand their basic nature and qualities?
A wave can be described as a disturbance that travels through a medium from one location to another location. Consider a slinky wave as an example of a wave. When the slinky is stretched from end to end and is held at rest, it assumes a natural position known as the equilibrium or rest position. The coils of the slinky naturally assume this position, spaced equally far apart. To introduce a wave into the slinky, the first particle is displaced or moved from its equilibrium or rest position. The particle might be moved upwards or downwards, forwards or backwards; but once moved, it is returned to its original equilibrium or rest position. The act of moving the first coil of the slinky in a given direction and then returning it to its equilibrium position creates a disturbance in the slinky. We can then observe this disturbance moving through the slinky from one end to the other. If the first coil of the slinky is given a single back-and-forth vibration, then we call the observed motion of the disturbance through the slinky a slinky pulse. A pulse is a single disturbance moving through a medium from one location to another location. However, if the first coil of the slinky is continuously and periodically vibrated in a back-and-forth manner, we would observe a repeating disturbance moving within the slinky that endures over some prolonged period of time. The repeating and periodic disturbance that moves through a medium from one location to another is referred to as a wave.
Hope That Helps!!
Explanation:
what is focus of convex
Answer: lens is thicker at the central egde
Explanation:
5. Which type of energy do all objects
contain?
Answer:
kinetic energy
Explanation:
An object is dropped from a height of 78.0 m. How long will it take to hit the ground?
Answer:
3.98978287s
Explanation:
v²=u²+2as
v²=0²+2(9.8)(78)
v²=1528.8m/s
∴v=39.09987212m/s (speed when object hits the ground)
v=u+at
39.09987212=0+9.8t
∴t=3.98978287s
wo models of the same compound are shown.
A top line labeled Model A saying C subscript 2 H subscript 4 O subscript 2. A bottom image with 2 C's connected by 1 black line. The left C has 3 H's connected to it by 1 black line each and the right C has 2 Os attached to it, the top O by two black lines and the bottom O by 1 black line. The bottom O also has an H attached to it by 1 black line.
In what way is Model B better than Model A?
Model B shows the types of elements in the compound, but Model A does not.
Model B shows the three-dimensional shape of the molecule, but Model A does not.
Model B shows how the atoms in the molecule are connected, but Model A does not.
Model B shows the number of atoms of each element in the molecule, but Model A does not.
Answer:
its c. , Remember that the answer isnt B. Cause here is proof.
Explanation:
A force of 5 N gives to mass my and an acceleration of 8m/s2 and a mass m2
an acceleration of 24m/s2. What acceleration would it give if both masses are
tied together
Answer:
a=6m/sec²
Explanation:
f=5 N
a1=8m/sec²
a2=24m/sec
m1=f/a1=5/8kg
m2=f/a2=5/24kg
New, f=(m1+m2)a
a=5/5/8+5/24=5/15+5/24=24*5/20
a=6m/sec²
Go to the roller coaster simulation and click on the “launch” button. Pay attention to the pie chart as the roller coaster moves and fill in the blank. Be sure to keep this website open because there will be several questions related to it. The kinetic energy as the roller coaster goes downhill.
Answer:
increases
Explanation:
Answer:
increases
Explanation:
which term best discribes our sun
Answer:
medium sized star
Explanation:
If a bicyclist travels 25 km/h, how long will it take her to travel 40 km?
Answer: 1.6 hours
Explanation: 40/1.6 = 25
A car of mass 500 kg travelling at 36 km/hr brought to
rest over a distance of 40m find the average retraldation and
average braking force
Answer:
Explanation:
mass, m = 500 kg
initial velocity, u = 36 km/h = 10 m/s
final velocity, v = 0
distance, s = 40 m
[tex]v^{2} = u^{2} + 2as[/tex]
[tex]0^{2} = 10 ^{2} +[/tex] 2 × a × 40
0 = 100 + 80 a
- 80a = 100 - 0
-80a = 100
a = -100 / 80
a = -1.25 m/[tex]s^{2}[/tex]
force, f = ?
mass = 500 kg
acceleration = -1.25 m/s^2
f = ma
= 500 × -1.25
= -625 N
Hope this helps
plz mark as brainliest!!!!!!!
What forces are acting on a book lying on the table? Are action-reaction forces involved in this situation?
ILL GIVE YOU ANYTHING TO ANSWER THIS!! IM HELPING MY CRUSH AND IDK THE ANSWER TO THIS PLZ HELP!
C is your answer. PH is an acidic trait used to define just how acidic an acid is. Since you are classifying an acid it would go in C with PH.
What is the magnitude of the initial velocity?
Magnitude of initial velocity
To calculate the magnitude of the velocity at any point in time, multiply the constant acceleration rate times the time difference and then add it to the initial velocity. As an example, if you dropped a rock off a cliff, its velocity increases by 32 feet per second, every second.
Hope this helps you a lot ...Good day :)
Answer:
magnitude of initial velocity
Explanation:
To calculate the magnitude of the velocity at any point in time, multiply the constant acceleration rate times the time difference and then add it to the initial velocity. As an example, if you dropped a rock off a cliff, its velocity increased by 32 feet per second, every second
please help!!! I will mark brainly.
A parachute on a drag-race car opens and changes the velocity of the car from 75 meters per second to 25 meters per second in just 5 seconds. Calculate the acceleration of the car.
Explanation:
v = u + at
25 = 75 + a * 5
25 = 75 + 5 a
a = 25 - 75/5
a = -50/5
a = -10m/sec^2
please mark me as a brainelist
Describe the motion of an object in which it's speed is constant but the velocity is changing?
Answer:
To summarize, an object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of the object is...
HELP ASAP HELP Two tennis balls of the same mass are served at different speeds: 30 m/s and 60 m/s. Which serve has more kinetic energy and by how much? Defend your answer. *
Answer:
The second ball has four times as much kinetic energy as the first ball.
Explanation:
Kinetic Energy
Is the type of energy an object has due to its state of motion. It's proportional to the square of the speed.
The equation for the kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where:
m = mass of the object
v = speed at which the object moves
The kinetic energy is expressed in Joules (J)
Two tennis balls have the same mass m and are served at speeds v1=30 m/s and v2=60 m/s.
The kinetic energy of the first ball is:
[tex]\displaystyle K_1=\frac{1}{2}m\cdot 30^2[/tex]
[tex]\displaystyle K_1=\frac{1}{2}m\cdot 900[/tex]
[tex]K_1=450m[/tex]
The kinetic energy of the second ball is:
[tex]\displaystyle K_2=\frac{1}{2}m\cdot 60^2[/tex]
[tex]\displaystyle K_2=\frac{1}{2}m\cdot 3600[/tex]
[tex]K_2=1800m[/tex]
Being m the same for both balls, the second ball has more kinetic energy than the first ball.
To find out how much, we find the ratio:
[tex]\displaystyle \frac{K_2}{K_1}=\frac{1800m}{450m}[/tex]
Simplifying:
[tex]\displaystyle \frac{K_2}{K_1}=4[/tex]
The second ball has four times as much kinetic energy as the first ball.
Answer:
he second ball has four X as much kinetic energy as the first ball
Explain:
Kinetic Energy Is the type of energy an object has due to its state of motion. It's proportional to the square of the speed
m/the mass of the object
v/the speed at which the object moves
The kinetic energy is expressed in Joules (J)
Two tennis balls have the same mass m and are served at speeds v1=30 m/s and v2=60 m/s.
Being m the same for both balls, the second ball has more kinetic energy than the first ball. So there for The second ball has four times as much kinetic energy as the first ball.
define pressure. write it's Si unit.
A ball is thrown vertically upwards with a velocity of 50 m/s. calculate
(a) the maximum height to which it rises.
(b) the total time it takes to return to the surface of earth. (take g =10 m/s2 )
Answer:
Given, For a vertically thrown upward,
Initial velocity (u) = 50m/s
Final velocity (v) = 0m/s { ∵ the body is thrown vertically upward }
Acceleration due to gravity(a) = -(g)= -10m/s²
Height reached (h) = ? , Time taken (t) = ?
We know that,v² = u²+2as
or, 0² = (50)²+2×(-10)×h { ∵ s=h }
or, 0 = 2500+(-20h)
or, 0 = 2500-20h
or, 20h = 2500
or, h = [tex]\frac{2500}{20\\}[/tex]
∴ h = 125metres
Also, v = u + at
or, 0 = 50+(-10)×t
or, 0 = 50-10t
or, 10t = 50
or, t = [tex]\frac{50}{10}[/tex]
∴ t = 5seconds ANS
Hence, The height reached by the ball is 125m and time taken is 5secs.
9. An object is launched at a velocity 40m/s in adirection making an angle of 60° upward with the horizontal.
a)what is the maximum height reached by the object?
b)what is the time of the object?
c)what are the horizontal and vertical componenet of vectors?
Answer:
a) 61.224 m
b) t = 7.070 seconds
c) horizontal component = 20 m/s; vertical component = 34.641 m/s
Note: I rounded all of these values to the nearest thousandth but if you want the precise values please read the explanation below.
Explanation:
Horizontal and Vertical Components:Let's start this problem by solving for the horizontal and vertical components of the initial velocity vector.
We can solve for these x- and y-components by using the formulas:
h. component: [tex]v_i \times cos \theta[/tex]v. component: [tex]v_i \times sin \theta[/tex]Where [tex]v_i[/tex] is the initial velocity (here it's given to us: 40 m/s) and [tex]\theta[/tex] is the angle at which the object is launched above the horizontal (it's also given to us: 60°).
Substitute these given values into the formulas to solve for the horizontal and vertical components:
h. component = [tex]40 \times $cos(60)[/tex] v. component = [tex]40 \times $sin(60)[/tex]Input these values into a calculator and you will get:
h. component = 20 m/sv. component = 34.641 m/sTime of the Object:Now we want to solve for the time t of the object before finding the maximum height of the object. In other words, the max height of the object is its vertical displacement at half of the time t we're about to find.
In order to solve for t, we can use one of the constant acceleration equations we are given in Physics. This equation is:
[tex]v_f=v_i+at[/tex]The time t is always solved for by using the vertical (y-direction) motion of the object in projectile motion, so therefore, we are going to be using this equation in terms of the y-direction.
[tex](v_f)_y = (v_i)_y + a_yt[/tex]Time is the same regardless of the x- or y- direction.
Now, we don't necessarily know the final velocity of the projectile, but we do know its final velocity in the y-direction at the very top of the trajectory, which is 0 m/s.
We can use this to our advantage and solve for only half of the time t, then multiply it by 2 at the end to get the full time that the object is in the air.
We have already solved for [tex](v_i)_y[/tex], which is the vertical component. We know that an object in projectile motion has an acceleration of -g in the y-direction, so we use -9.8 m/s² for a.
[tex]0=(40\times $sin(60)) + (-9.8)t[/tex]Subtract the vertical component from both sides of the equation.
[tex]-(40 \times $sin(60))= -9.8t[/tex]Divide both sides of the equation by -9.8 in order to solve for t.
[tex]\text{t}=3.534797566\ \text{seconds}[/tex]Remember that this is only half of the time that the object spends in the air. However, this is the time that it takes for the object to reach its maximum height, which we will use later. For now, let's say that the time of the object is 2t.
[tex]\text{2t = 7.069595132 seconds}[/tex] Maximum Height of the Object:In order to find the maximum height of the object, let's use another kinematic equation for constant acceleration:
[tex]$x_f=x_i+v_it+\frac{1}{2} at^2[/tex]Since we are still dealing with the y-direction, we can change this equation to be in terms of y.
[tex]$(x_f)_y = (x_i)_y + (v_i)_yt + \frac{1}{2} a_yt^2[/tex]The displacement in the y-direction, or the vertical displacement, can be modeled by subtracting [tex](x_i)_y[/tex] from both sides of the equation.
[tex]$\triangle x_y = (v_i)_yt + \frac{1}{2} a_yt^2[/tex]In order to solve for the maximum height of the object, we want to use the time t that it takes for the object to reach its highest point, which we found was ~3.53 seconds. This is true because the object essentially follows the movement of a parabola.
We know the vertical component [tex](v_i)_y[/tex] , and we know the acceleration in the y-direction is -g, so let's substitute these values into the formula for vertical displacement and solve for [tex]\triangle x_y[/tex].
[tex]$\triangle x_y = (40 \times \text{sin}(60))(3.534797566) + \frac{1}{2} (-9.8)(3.534797566)^2[/tex] [tex]$\triangle x_y = (122.4489796) + \frac{1}{2} (-9.8)(3.534797566)^2[/tex] [tex]$\triangle x _y = (122.4489796) -(4.9 \times 3.534797566^2)[/tex] [tex]$\triangle x_y = (122.4489796) - (61.22448978)[/tex] [tex]$\triangle x_y = 61.2244898[/tex]The maximum height of this object in projectile motion is 61.224 m.
(This answer exceeded the character limit if I included the "Helpful Shortcuts" section, so I included it as an attachment in case you're interested.)
Describe the importance that keystone species have in the environment. What would happen if these species disappeared? How would it affect the local ecosystems?
Answer:
See the answer below
Explanation:
The keystone species of an environment are those species of organisms that are highly influential to the functioning of the ecosystem without whom the ecosystem would be drastically affected, lose its structure, or cease to exist totally.
The influence of keystone species in an environment is disproportionately high when compared to their population in the environment. If keystone species disappeared from an environment, such an environment will find it difficult to perform ecosystem functions with an entirely different structure. In some cases, the ecosystem might cease to exist in its entirety because the species that hold it together are no longer present.
How dogs can help scientists better understand human disease
Answer:
They can also help us better understand human diseases. Because the development, progression and behavior of several disorders afflicting humans and dogs are so similar, understanding the genetic components of these diseases in dogs can give us an idea of what may be happening in humans.
Explanation:
.
Moon A has a mass of 3M and a radius of 2R. Moon B has a mass of 4M and a radius of R. What is the ratio of the force of gravitational attraction of Moon A for Moon B to the force of gravitational attraction of Moon B for Moon A?
A.) 1:1
B.) 1:5.3
C.) 5.3:1
D.) 0.75:4
Answer:
c
Explanation:
5.3" (and any subsequent words) was ignored because we limit queries to 32 words.
I need help with this, Help me
Answer:
283.78
Explanation:
Under what conditions do rocks experience the strongest physical weathering?
Answer:
correct me if im wrong but i think its erosion because they are being broken down.
