Answer:
Acceleration, a = -0.5 m/s²
Explanation:
Given the following data;
Initial velocity = 72 km/h
Final velocity = 18 km/h
Time = 10 seconds
To find the acceleration of the car;
Conversion:
72 km/h to m/s = 72*1000/3600 = 20m/s
18 km/h to m/s = 18*1000/3600 = 5 m/s
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.
Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
Substituting into the equation;
[tex]a = \frac{5 - 20}{10}[/tex]
[tex]a = \frac{-5}{10}[/tex]
Acceleration, a = -0.5 m/s²
Therefore, the car is decelerating.
A 15kg dog jumps out of a 40 kg canoe. If the dog's velocity is 1.2 m/s, what is the velocity of the canoe
Answer:
the velocity is 0.45 m/s and it is moving in the opposite direction
or
-0.45 m/s
Explanation:
The law of conservation of momentum says that initial momentum = final momentum
( mass x velocity of the dog ) = - (mass x velocity of the canoe)
(15 x 1.2) =- (40 x velocity of the canoe)
Velocity of the canoe = -(15 x 1.2) / 40 = -0.45 m/s
You push a box 3.5 m across the floor with a constant force of 12.4 N. How much work do you do on the box?
Answer:
43.4 N (newton)
What is the resistance of resistor R3?
Answer: 2.0
Explanation: I KNOW !
What is exothermic .Is it a reaction?
Answer:(of a reaction or process) accompanied by the release of heat.
Explanation: trust moi
What is the voltage drop across the 30 q resistor?
A. 120 v
B. 30 V
c. 2 v
D. 60 V
Answer:
120v 120v 120v 120v 120v
For the mirror configuration below, the angle of incidence for the going towards the mirror on the right is 15 degrees. What is the angle of reflection for the light ray leaving the mirror on the bottom
Answer:
Thus, the angle of reflection is 15 degrees.
Explanation:
Angle of incidence, i = 15 degrees
The angle of incidence is the angle between the normal to the mirror and the incident ray, the angle of reflection is the angle between the reflected ray and the normal to the mirror.
According to the laws of reflection, the angle of incidence is equal to the angle of reflection.
Thus, the angle of reflection = angle of incidence = 15 degrees
if displacement covered by a particle is zero then distance cover by it
Answer:
When displacement is zero, the particle may be at rest, therefore, distance travelled = 0.
Again, when displacement is zero, the final position matches with the initial position after some time, but the distance travelled will not be zero.
Is it important to constantly stay connected for you?
Answer:
no
Explanation:
Which of the following statements is CORRECT?
Question options:
A. Sounds that differ in frequency differ in amplitude.
B. Sounds that differ in loudness are said to differ in quality.
C. The speed of sound in air at 20ºC is 330 m/s .
D. Sound does not require a medium in order to travel through
E. Sound waves are an example of longitudinal waves.
Answer:
E.) Sound Waves are an example of longitudinal waves.
Explanation:
I was sure either A or E was correct so I had to look it up. In reference to three sources, it is proven that sound waves are longitudinal. Therefore, without a doubt, I would try to go with E. I know D is wrong as well as B most definitely. That is because sound always requires a medium to travel through in order to be heard; additionally sounds don't necessarily have to be a certain rate of loudness in order to be considered of different quality. Therefore leaving you with A, C, or E. Additionally C is a false fact as well. So I highly suggest choosing E because there is sufficient sources to prove that. I'll provide a direct link down below.
https://www.bing.com/search?q=are+sound+waves+longitudinal+waves&cvid=fc17d9f3f744496da334cf10a7daad57&aqs=edge..69i57l2j69i60j5j69i61j69i60l2.5395j0j1&pglt=2339&FORM=ANNTA1&PC=NMTS
The correct statement is sound waves are an example of longitudinal waves.
Which is an example of the longitudinal wave?In a longitudinal wave, the particles are displaced parallel to the direction the wave travels. An example of longitudinal waves is compressions moving along a slinky. We can make a horizontal longitudinal wave by pushing and pulling the slinky horizontally.
Is sound a longitudinal wave?Sound is a longitudinal wave that alternately compresses and decompresses the component particles of the medium through which it travels.
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John and Henry push a piano with 800N, and the piano refuses to move. According to the definition of work in physics, there is NO work done on the piano.
Answer:
Explanation:
This is true because the definition of work is the parallel force required to move an object times the distance it moves. If it doesn't move, no work has been done. That is not to say that no energy has been expended, because it most certainly has! But that is not the same thing.
A 10- kilogram box is at static equilibrium and the downward pull of gravity acting on the box is 98 Newton's what is the minimum force that would be required to just pick up the box ?
Answer:
Explanation:
Now
Look at it this way. This box is in equilibrium... Meaning forces around balanced out.
Now...
The Earth's pull on it is 98N
What Minimum external forces is needed to pick this up....
Now... The Minimum Force is 98N
Why?
Since This Box is under the influence of gravity...
Gravity is acting as a resistance
If you apply a force less than 98N... Let's say 50N on this box... It won't budge because your applied force is less than the resisting force on it(98N).
So We need a force ≥98. So the least force is 98N. Nothing below this will move the Box
Answer 98N.
Answer:
See image
Explanation:
Plato
You weigh a bear by making him stand on four scales as shown. Draw a free-body diagram showing all the forces acting on the bear. If his weight is 1,500 newtons, what is the reading on
the fourth scale?
Answer:
what a fat bear I love physics
Ohm's law states which relationship between electrical quantities? a. Volts = current x resistance b. Volts = current divided by amps c. Volts = coulombs divided by charge d. Volts = resistance times charge
Answer:
a. Volts = current x resistance
Explanation:
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
Hence, Ohm's law gives the relationship between voltage, current and resistance of an electric circuit.
If the index of refraction for a certain glass is 1.5, and the angle of refraction is 15 degrees for a ray of light
traveling from air (index of 1) what is the angle of incidence? (in coming beam)
Round your answer to the nearest tenth of a digit. The answer is in degrees so don't worry about the units
Answer:
[tex]\theta_i = 23^o[/tex]
Explanation:
The refractive index of a medium is given by the following formula:
[tex]\eta = \frac{Sin\theta_i}{Sin\theta_r}[/tex]
where,
η = refractive index = 1.5
[tex]\theta_i[/tex] = angle of incidence = ?
[tex]\theta_r[/tex] = angle of refraction = 15°
Therefore,
[tex]1.5 = \frac{Sin\theta_i}{Sin15^o}\\\\Sin\theta_i=(1.5)Sin15^o\\\\\theta_i = Sin^{-1}(0.388)\\\\[/tex]
[tex]\theta_i = 23^o[/tex]
Rex decides to launch a priceless vase into the air at a 90-degree angle. The initial velocity vase is +7.0 m/s. Dylan claims that the vase would achieve a higher height if it were launched at a 45-degree a Dylan correct? A. Dylan is correct because a 45-degree launch angle results in the largest vertical range B. Dylan is correct because larger launch angles result in a smaller vertical range. C. Dylan is incorrect because a 90-degree and 45-degree launch angle result in the same range. D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
Answer:
D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
Explanation:
Projectile is the motion of an object thrown into space. When an object is thrown into space, the only force which acts on it is the acceleration due to gravity.
An object thrown into space would reach maximum height (vertical range) if it is launched at an angle of 90 degrees. For maximum horizontal range, the object needs to be launched at an angle of 45 degrees.
Therefore Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
The correct statement is
D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range
Information regarding projectile:It is the object motion that should be thrown into space. At the time when the object is thrown into space, the only force that should act on it represent the acceleration because of gravity.
Since object thrown into space should have to reach maximum height in the case when it is launched the 90 degrees angle. Due to the above reasons, option D is considered.
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A moon orbits a planet in a nearly circular orbit of radius R, as shown in the figure. Which of the following free-body diagrams could be used to analyze the forces exerted on the moon when it is at the position indicated in the figure?
I don't see any free body diagrams.
Free body diagram of a moon orbits a planet in a nearly circular orbit of radius R, as shown in the figure is attached in the answer. This could be used to analyze the forces exerted on the moon when it is at the position indicated in the figure.
What is free body diagram?Free-body diagrams are used to display the relative strength and direction of all forces that are being applied to an item in a certain scenario. A unique illustration of the vector diagrams that were covered in a previous lesson is the free-body diagram. We will make use of these graphics throughout our study of physics. In a free-body diagram, the size of the arrow indicates the strength of the force.
The force is acting in the direction indicated by the arrow's direction. The exact type of force is labelled next to each force arrow in the diagram. In a free-body diagram, it is common practice to depict the item as a box and to draw the force arrow from the box's center outward in the direction that the force is acting.
Learn more about free body diagram here:
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I will give the brainiest for the one who answers it first and CORRECTLY! (pls don't just randomly put any answer just to get points!) Select the correct answers. Which TWO statements are true about generators?
. They covert motion energy to electric energy
. They have a pair of magnets and a rotating metal coil
. They're powered by fossil fuels
.They convert electric energy to motion energy
.They use the relative motion of magnet and coil of wire
Answer:The true statements about generators would be :
They convert motion energy to electric energy
They use the relative motion of a magnet and a coil of wire.
Explanation:
Generators use the energy of the rotating coil in relative motion with magnets to induce a current within the wire. Generators are devices that convert energy into a voltage by the relative motion of the magnet and a coil that changes flux.
A motor is used to pump water from a depth of 5m to fill a volume of 10cubic meter in 5 min . If 50 percent of the power is wasted , What is the power of the motor?
6.) What is the missing element?
a. Hydrogen
b. Helium
c. Carbon
d. Nitrogen
Answer:
It's nitrogen. Specifically, this is the alpha emission of an N-15 isotope.
Which of the following characteristics were not included in John Dalton's description of the atom? A. In any element, all the atoms are the same. B. Atoms are smaller than quarks. C. All matter is made up of atoms. D. Atoms exist only on Earth. E. Elements in a compound are always in a constant ratio. NO LINKS OR VIRUSES PLS
Answer:
d
Explanation:
atoms exits everywhere
Answer: The correct choices to this question are, "B. Atoms are smaller than quarks," and "D. Atoms only exist on earth." Hope this helped.
How much energy is needed to raise the temperature of a 2 g piece of iron from 20 degrees C to 120 degrrees C
Answer:
the amount of energy needed to raise the temperature of the iron is 90 J.
Explanation:
Given;
mass of the iron, m = 2 g
initial temperature, t₁ = 20⁰ C
final temperature, t₂ = 120⁰ C
specific heat capacity of iron, c = 0.45 J/g⁰C
The amount of energy needed to raise the temperature of the iron is calculated as follows;
H = mcΔt
H = mc(t₂ - t₁)
H = 2 x 0.45 x (120 - 20)
H = 90 J
Therefore, the amount of energy needed to raise the temperature of the iron is 90 J.
Which of the following is true
Answer:
E
Explanation:
What is the major function of Eustachain tube of ear?
Answer:
Explanation:
Eustachian tube is located in between the middle ear and the nasopharynx.It's function is to control the pressure within the middle making it equal to the air pressure outside the body.
Name the component used in electric circuits that is sensitive to temperature
Answer :
Tungsten filamentDepending on how there used, pulleys can have different uses. One use for pulleys is that they can...
A. Increase the total work needed
B. Decrease the total work needed
C. Change the direction of a force
D. Roll things down a ramp
0.160-kg hockey puck is moving on an icy, frictionless, horizontal surface. At t 0, the puck is moving to the right at 3.00 m/s. (a) Calculate the velocity of the puck ( magnitude and direction) after a force of 25.0 N directed to the right has been applied for 0.050 s. (b) If, instead, a force of 12.0 N directed to the left is applied from 0 tot 0.050s, what is the final velocity of the puck
Answer: [tex](a)10.812\ m/s\ (b)\ 0.75\ m/s\ \text{left}[/tex]
Explanation:
Given
Mass of hockey puck [tex]m=0.160\ kg[/tex]
Initial velocity of hockey puck is [tex]u=3\ m/s[/tex]
First a horizontal force of [tex]25\ N[/tex] is applied to the right for [tex]0.05\ s[/tex]
acceleration associated with it is
[tex]\Rightarrow a=\dfrac{25}{0.160}\\\\\Rightarrow a=156.5\ m/s^2[/tex]
Using equation of motion i.e.
[tex]\Rightarrow v=u+at\\\Rightarrow v=3+156.25\times 0.05\\\Rightarrow v=3+7.812\\\Rightarrow v=10.812\ m/s[/tex]
(b) When a force of [tex]12\ N[/tex] is applied for 0.05s
Using equation of motion i.e.
[tex]\Rightarrow v=3-\dfrac{12}{0.160}\times 0.05\\\\\Rightarrow v=3-75\times 0.05\\\Rightarrow v=3-3.75\\\Rightarrow v=-0.75\ m/s\\\Rightarrow v=0.75\ \text{towards left}[/tex]
A __________ is a push or pull.
Answer:
force
Explanation:
Force is a push or a pull of an object that causes the object to speed up, slow down, or stay in one place. In other words, a force is what causes an object to move. Friction and gravity are two types of forces that influence how an object moves.
1. Explain and find the volume of the round pan rounded to the nearest tenth.
2. Explain and find the volume of the rectangular pan rounded to the nearest tenth.
3. Explain how the volume of the two cake pans compare.
4. The cake density is 0.454 ounce per cubic inch and the fair price is $0.20 per ounce. What should be a fair price for each cake?
Explanation:
1. Given,
Diameter of the round pan = 8in
Radius of the round pan = 8/2 = 4in
Height of the round pan = 2in
Therefore,
Volume of the round pan
[tex]\pi {r}^{2} h[/tex]
[tex] = 3.14 \times 4in \times 4in \times 2in[/tex]
[tex] = 100.48 {in}^{3} [/tex]
When rounded to nearest tenth,
[tex] = 100.5 {in}^{3} (ans)[/tex]
2. Given,
Dimensions of the rectangular pan = 12in, 8in, 2in
Therefore,
Volume of the rectangular pan = breadth × height × length
= 12in × 8in × 2in
[tex] = 192 {in}^{3} [/tex]
When rounded to nearest tenth,
[tex] = 192.00 {in}^{3} [/tex]
[tex] = 192.0 \: or \: 192 {in}^{3} [/tex]
3. Volume of round pan
[tex] = {100.5in}^{3} [/tex]
Volume of Rectangular pan
[tex] = 192 {in}^{3} [/tex]
Hence,
Their difference of volume will be ,
[tex] = (192 - 100.5) {in}^{3} [/tex]
[tex] = 91.5 {in}^{3} (ans)[/tex]
4. In this case we must know either the mass of the cake or its volume.
Given the case that we know the mass of the cake, it would be:
price = x * 0.2
where x is the mass of the cake in ounces, that is to say if for example a cake has a mass of 10 ounces, it would be:
price = 10 * 0.2 = 2
which means that each cake costs $ 2
Given the case of the volume, we must first multiply the density by this volume in order to calculate the mass and finally the price.
price = x * 0.454 * 0.2
where x is the volume of the cake in cubic inches, if for example the volume is 10 cubic inches it would be:
price = 10 * 0.454 * 0.2 = 0.908
which means that each cake costs $ 0.9
What is the magnitude of kinetic energy of a 20kg box moving at a velocity of 8m/s
A. 160 J
B. 80 J
C. 640 J
D. 1280 J
Answer:
Explanation:
[tex]KE=\frac{1}{2}mv^2[/tex] and we are solving for KE:
[tex]KE=\frac{1}{2}(20)(8)^2[/tex] which gives us that
KE = 640 J, choice C.
What is a specific heat capacity of air in calorie per gram Celsius?
Answer:
I dont know hehe
Explanation:
Sakit na ulo ko.