Answer:
The total distance covered by the car is 3,810.08 m
Explanation:
Given;
initial speed of the car, u = 72 km/hr = 20 m/s
initial time, t₁ = 15 minutes = 900 s
final speed of the car, v = 80 km/hr = 22.22 m/s
final time, t₂ = 12 minutes = 720 s
The acceleration of the car is given as;
[tex]a = \frac{v-u}{t_2 -t_1} \\\\a = \frac{22.22-20}{900-720}\\\\a = 0.0123 \ m/s^2[/tex]
The total distance covered by the car is given as;
v² = u² + 2as
where;
s is the total distance covered by the car
22.22² = 20² + 2(0.0123)s
22.22² - 20² = 2(0.0123)s
93.728 = 0.0246s
s = 93.728 / 0.0246
s = 3,810.08 m
Therefore, the total distance covered by the car is 3,810.08 m
Answer:
34 km
Explanation:
Remark
You are dealing with distance not direction. So you just figure out the two parts separately and add.
15 minutes
t = 15 minutes * 1 hour / 60 minutes = 0.25 hours.
r = 72 km / hr
d = 72 km / hr * 0.25 hours
d = 18 km
12 minutes
t = 12 minutes * 1 hour/ 60 minutes = 0.2 hours
r = 80 km/hour
d = 80 * 0.2 = 16 km
Total distance
d = d1 + d2
d = 18 + 16 = 34 km
PLEASE HELP ME. And ACTUALLY give correct answers and EXPLAIN because these are free responses. If you get it right, I will mark you brainliest.
a 2kg box frictionless ramp angle 60 degrees top of ramp is 30 m how long will it take to reach the ground
Answer:
2.66secs
Explanation:
To get the time it will take to reach the ground, we will use the equation of motion;
S = ut + 1/2at²
S is the distance
u is the initial velocity
g is the acceleration due to gravity
Given
S = 30m
u = 0m/s
Let's get the acceleration
According to newton's second law;
[tex]\F_x = ma_x\\F_m - F_f = ma_x\\mgsin \theta - 0 = ma_x\\gsin\theta = a_x\\a_x = 9.8sin 60\\a_x = 9.8(0.8660)\\a_x = 8.49m/s^2[/tex]
Get the required time:
Recall that: S = ut + 1/2at²
Substitute the given parameters and find t
30 = 0(t) + 1/2(8.49)t²
30 = 4.24t²
t² = 30/4.24
t² = 7.08
t = √7.08
t = 2.66secs
Hence it take the box 2.66seconds to reach the ground
Projectiles move in which two directions?
Analyzing two-dimensional projectile motion is done by breaking it into two motions: along the horizontal and vertical axes.
hope it helps!!
Answer:
up and down
Explanation:
this is because they do have the correct flagellum to move to the left and to the right
The process of a nucleus giving off radioactive particles to become more stable is called
Answer:
Radioactive Decay
Explanation:
A 45kg sled is being pulled from camp by 5 dogs each capable of exerting 25N force on the sled. If the sled starts from rest and the frozen ground exerts 15N of friction, how far will the sled be from the camp after 7s?
Answer:
58.8m
Explanation:
Un carro parte del reposo y acelera uniformemente a 4.0 m / s^2 durante 5.0 s. A continuación, mantiene la velocidad que alcanzó durante 10 s. Luego, disminuye la velocidad a una velocidad constante de 2.0 m / s^2 durante 4.0 s.
Answer:
Average speed of the car = 16.53 m.s
Explanation:
For first 5 seconds:
As the car starts from rest, so the initial speed of the car, u=0
Acceleration, a= 4 m/s^2
So, the final speed (speed at time, t=5 second)
v=u+at
v=0 + 4 x 5 = 20 m/s
Distance covered,
[tex]s=ut+\frac 1 2 a t^2 \\\\s=0+\frac 1 2 \times 4 \times 5^2[/tex]
s=50 m
As the car maintained the constant speed of 20 m/s for the next 10 seconds.
Distance traveled in 10 seconds, d=20 x 10 =200 m
For the last 4 seconds:
The car slows down at the rate of 2.0 m / s ^ 2 from the speed of 20 m/s.
As the car slows down, so the acceleration will be negative, i.e a=-2 m/s^2
[tex]s=ut+\frac 12 at^2 \\\\s=20\times 4 +\frac 12 (-2)4^2[/tex]
s=80-16=64 m.
Considering all three cases, the total distance covered=
=50+200+64=314 m
Total time= 5+10+4=19 s
So, the averate peed= Totat distance covered / total time taken
=314/19=16.53 m/s
A man can jump 1.5 m on earth. calculate the approximate
height he might be
able to jump on
a planet whose
density is one quarter of the earth and where radius
is one third that of earth.
Radius of earth = 6400km
Acc. due to gravity=9.8 m/s²
Mass of earth = 6X10^24 kg
Answer:
18 m
Explanation:
G = Gravitational constant
m = Mass of planet = [tex]\rho V[/tex]
[tex]\rho[/tex] = Density of planet
V = Volume of planet assuming it is a sphere = [tex]\dfrac{4}{3}\pi r^3[/tex]
r = Radius of planet
Acceleration due to gravity on a planet is given by
[tex]g=\dfrac{Gm}{r^2}\\\Rightarrow g=\dfrac{G\rho V}{r^2}\\\Rightarrow g=\dfrac{G\rho \dfrac{4}{3}\pi r^3}{r^2}\\\Rightarrow g=\dfrac{4G\rho\pi r}{3}[/tex]
So,
[tex]g\propto \rho r[/tex]
Density of other planet = [tex]\rho_p=\dfrac{1}{4}\rho_e[/tex]
Radius of other planet = [tex]r_p=\dfrac{1}{3}r_e[/tex]
[tex]\dfrac{g_e}{g_p}=\dfrac{\rho_e r_e}{\rho_p r_p}\\\Rightarrow \dfrac{g_e}{g_p}=\dfrac{\rho_e r_e}{\dfrac{1}{4}\rho_e\times \dfrac{1}{3}r_e}\\\Rightarrow \dfrac{g_e}{g_p}=12\\\Rightarrow g_p=\dfrac{g_e}{12}\\\Rightarrow g_p=\dfrac{9.8}{12}[/tex]
Since the person is jumping up the acceleration due to gravity will be negative.
From kinematic equations we have
[tex]v^2-u^2=2g_es\\\Rightarrow u^2=v^2-2g_es\\\Rightarrow u^2=0-2\times -9.8\times 1.5\\\Rightarrow u^2=2\times 9.8\times 1.5[/tex]
On the other planet
[tex]v^2-u^2=2g_ps\\\Rightarrow s=\dfrac{v^2-u^2}{2g_p}\\\Rightarrow s=\dfrac{0-(2\times 9.8\times 1.5)}{2\times -\dfrac{9.8}{12}}\\\Rightarrow s=18\ \text{m}[/tex]
The man can jump a height of 18 m on the other planet.
If you put 2 eggs in water for 5 secs will it explode???
Answer:
No not at all
Explanation:
Answer:
Hard-boiled eggs don't react well (or, depending on the perspective, react extremely well) to microwaves. Heat one up in a microwave and — assuming it doesn't burst
so yeah it does not explode
A ball is rolling down a track as shown. How fast must it be going at A in order to just make it to the top of B? The ball is at Peak A which is 5.0 m tall and wants to go to Peak B, which is 10.0m tall
Answer:
v = 98.1 m/s
Explanation:
We will apply the law of conservation of energy here, between peak A and peak B.
Total Energy of Ball at A = Total Energy of Ball at B
[tex]K.E_{A}+P.E_{A}=K.E_{B}+P.E_{B}\\where,\\K.E_{A} = Kinetic\ Energy\ of\ ball\ at\ Peak\ A = \frac{1}{2}mv^{2} \\K.E_{B} = Kinetic\ Energy\ of\ ball\ at\ Peak\ B = \frac{1}{2}m(0)^{2} = 0\ J (since, ball\ stops\ at\ last) \\[/tex]
[tex]P.E_{A} = Potential\ Energy\ of\ ball\ at\ Peak\ A = mgh_{A}\\P.E_{B} = Potential\ Energy\ of\ ball\ at\ Peak\ B = mgh_{B}[/tex]
[tex]\frac{1}{2}mv^{2} + mgh_{A} = 0\ J + mgh_{B}\\m(\frac{1}{2}v^{2} + gh_{A}) = mgh_{B}\\v = \sqrt{2g(h_{B}-h_{A})}\\where,\\h_{A} = height\ pf\ peak\ A = 5\ m\\h_{B} = height\ pf\ peak\ B = 10\ m\\v = \sqrt{2(9.81\ m/s^{2})(10\ m-5\ m)}\\[/tex]
v = 98.1 m/s
The data table shows how the amplitude of a mechanical wave varies with the energy it carries. Analyze the data to identify the mathematical relationship between amplitude and energy. Use your equation to find the energy if the amplitude is 8 units.
Amplitude
1
2
3
4
energy
2
8
18
32
A.66 units
B. 108 units
C. 128 units
D. 88 units
Answer:
E∝A²
Energy varies as square of change in amplitude
If amplitude of 1 has energy of 2
Amplitude of 2 (double of 1) = (2x2)=4x2=8 4 times the energy at amplitude of 1.
For 8 units of amplitude change
8x8=64x2= 128 or C:
Explanation:
When the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.
The given parameters;
first amplitude, A = 1, corresponding energy = 2second amplitude, A = 2, corresponding energy = 8The energy of a string at a given amplitude is calculated as follows;
[tex]E = \frac{1}{2} kA^2\\\\\frac{E}{A^2} = \frac{E_1}{A_1^2}[/tex]
When the amplitude is 8, the energy of the wave is calculated as follows;
[tex]\frac{2}{1^2} = \frac{E_2}{8^2} \\\\E_2 = 2(8^2)\\\\E_2 = 2(64)\\\\E_2 = 128 \ units[/tex]
Thus, when the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.
Learn more here:https://brainly.com/question/21981451
When going from a fast speed to a slow speed how is light bent?
1.away from the normal line
2.toward the normal line
Answer:
Toward the normal line
Explanation:
I had the same question on a quiz
An empty coke bottle is dropped off a 236 m high cliff in Nairobi. At what speed does the bottle hit the ground?
Answer:
v=68[m/s]
Explanation:
To solve this problem we have to use the law of energy conservation, which tells us that potential energy is converted into kinetic energy.
[tex]E_{pot}=E_{kin}[/tex]
[tex]E_{pot}=m*g*h[/tex]
[tex]E_{kin}=0.5*m*v^{2}[/tex]
where:
m = mass [kg]
g = gravity acceleration = 9.81 [m/s²]
h = elevation = 236 [m]
v = velocity [m/s]
[tex]m*9.81*236=0.5*m*v^{2}\\2315.16 = 0.5*v^{2}\\v=\sqrt{4630.32} \\v=68[m/s][/tex]
Do you attract the earth or the earth attract you ?Which one is attracting with a large force ?You or the earth
Please select the word from the list that best fits the definition
Is equal to mass multiplied by velocity
Answer:
Hi... Your answer is impulse
The diagram is a real world example of the first and second laws of thermodynamics. It shows how thermal energy is used to generate electricity. Which best describes how the diagram illustrates both laws of thermodynamics?
Answer:
First law: kinetic energy is used to turn an electric generator
Second law: some thermal energy is lost to the environment as it travels through the system
Explanation:
The first law of thermodynamics is known as the law of conservation of energy. It states that energy can neither be created nor destroyed but can only be transferred or changed from one form to another. When thermal energy is used to generate electricity, the kinetic energy of the steam is used to turn the electric generator (thereby producing electrical energy).
The second law of thermodynamics states that energy transfer or transformation leads to an increase in entropy resulting in the loss of energy. This law also states that as energy is transferred or transformed, some is lost in a form that is unusable. When thermal energy is used to generate electricity, some of the thermal energy is lost to the environment as it travels through the system.
Answer:
NOT A
Explanation:
Sorry I couldn't guess it right. Source EDGEN
Referring to the graph below of data describing a cart pulled across a level surface. When a 4 N force pulls on the cart, the cart accelerates at 5 m/s^2. What is the friction force resisting the pull?
Answer:
0.5 N
Explanation:
(0.6 kg)(9.8 m/s^2) = 5.88 N
(0.6 kg)(5 m/s^2) = 3 N
4 N - 3 N = 1 N
1 N/5.88 N = 0.17
(0.17)(3 N) = 0.51 N which rounds to 0.5 N
When a 4 N force pulls on the cart, the cart accelerates at 5 m/s². The frictional force resisting the pull is 0.5 N.
What is friction?Friction is defined as the force preventing sliding solid surfaces, fluid layers, and material components from moving relative to one another. When two bodies in contact move in relation to one another, friction, a resistive force, arises. friction factors Between-body surface adhesion: When two materials are in close proximity to one another, a molecular force called adhesion is created.
(0.6 kg) (9.8 m/s²2) = 5.88 N
(0.6 kg) (5 m/s²2) = 3 N
4 N - 3 N = 1 N
1 N/5.88 N = 0.17
(0.17) (3 N) = 0.51 N ≅ 0.5 N
Thus, when a 4 N force pulls on the cart, the cart accelerates at 5 m/s². The frictional force resisting the pull is 0.5 N.
To learn more about friction, refer to the link below:
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What is the KE of a 13kg boulder moving at 78.3m/s?
Answer:
39850.785 J
Explanation:
0.5 x m x v^2
0.5x13x78.3^2
Answer:
KE =
[tex] \frac{1}{2} m {v}^{2} \\ [/tex]
Explanation:
[tex]ke = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times 13 \times {78 . 3}^{2} \\ ke = 39850.785j \\ [/tex]
What is the motion of the particles in this kind of wave?
O The particles will move up and down over large areas.
O The partices will move up and down over small areas.
O The particles will move side to side over small areas.
O The particles will move side to side over large areas.
Answer:
a is correct
The particles will move up and down over large areas.
Answer:
B. The particles will move up and down over small areas.
Explanation:
I just took the quiz and got 100% :)
A 25-newton horizontal force northward and a 35-
newton horizontal force southward act concurrently on
a 15-kilogram object on a frictionless surface. What is
the magnitude of the object's acceleration?
Answer:
2/3.or 0,67
Explanation:
acceleration = Result or sum of force / the mass
a = F/m
a = (35-25)/15
a = 10/15 = 2/3 m/s²
a = 0,67 m/s²
Determine the molar mass of CeAl12O19.
Answer:
1 mole = 767.882 g
1 gram = 0.001 mole
Explanation:
The molar mass of CeAl₁₂O₁₉ is 770.686grams. The molar mass of a substance is the amount of substance which is present in one mole of the compound.
What is Molar mass?Molar mass of a substance is the mass in grams of one mole of the compound or chemical substance. In a chemical substance, the amount of entities which are present such as atoms, molecules, ions, is defined as a mole. A mole of any substance has 6.022 × 1023 molecules in it.
The molar mass of CeAl₁₂O₁₉ can be calculated as it is made up of three atoms which are Ce (Cerium), twelve atoms of Aluminium (Al), and nineteen atoms of O (Oxygen).
Atomic mass of Cerium = 140.116u
Atomic mass of Aluminium = 26.981539 u
The mass of 12 Aluminium atoms = 12 × 26.98 u
The mass of 12 Aluminium atoms = 323.76 u
Atomic mass of Oxygen = 15.999 u
The mass of 19 atoms of Oxygen = 303.81 u
Therefore, the mass of CeAl₁₂O₁₉ = 140.116 u + 323.76 u + 303.81 u
The molar mass of CeAl₁₂O₁₉ is 770.686 grams.
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How the frequency of ultraviolet radiation compares to that of visible light?
Ultraviolet (UV) "light" is a type of electromagnetic radiation. UV light has a shorter wavelength than visible light. ... The wavelength of violet light is around 400 nanometers (or 4,000 Å). Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 1012 hertz) and 30,000 THz.
If you're starting at the lowest frequency that our eyes can see, you're at RED light.
Then, as you hike through higher and higher frequencies, you travel through orange light, yellow light, green light, blue light, violet light.
Suddenly, as you keep going to higher frequency, you can't see the light any more. You've crossed the line from violet to ULTRAviolet. Now your eyes don't know it's there. The frequency is too high. (Wavelength is too short.)
which is an example of non-renewable energy source?
a. petroleum
b. Solar energy
c. wind energy
d. geothermal energy
Answer:
Petroleum
Explanation:
Because Petroleum reservoirs can be depleted but something like wind energy wind will always be there
Answer: Petroleum
Explanation: Have a Good day!!
Pollen is one-celled, or unicellular. It is used for reproduction in many types of plants. The bee is collecting nectar and, while doing that is transferring the very tiny pollen grains. The bee and the flowering plant are multicellular organisms, but they both have many things in common with the unicellular pollen What is one feature NOT shared by all three? All are made of one or more cells. The cells of each contain genetic material. The cells of each contain exactly the same parts.
Answer:
The cells of each contain exactly the same parts.
Explanation:
Three different organisms are involved in this question viz: pollen, bee and flowering plant. According to the question, they are all living organisms, which means that they all contain one or more cells.
Although they all have cells but the cells of each does not contain exactly the same parts. Bee is an animal while pollen produced by the flowering plants are plants, hence, the parts/organelles contained in each cell of the mentioned organisms are mentioned.
A projectile is launched from ground level at an angle of 30.0° above horizontal with a speed of 10.0 m/s. If the projectile is moving over level ground, what is the maximum height above the ground that the projectile reaches?
Answer:
Maximum height = 1.27 m
Explanation:
Given:
θ = 30°
Speed = 10 m/s
Find:
Maximum height
Computation:
Maximum height = v²(sinθ)² / 2g
Maximum height = 10²(sin30)² / (2x9.81)
Maximum height = 1.27 m
A light ray transfers from more to less dense medium at certain condition , if we repeat this experiment by increasing the angle of incidence in more dense medium to double its value in the 1st condition so the value of the relative refractive index between the 2 media is
increased to double
decreased to half
still constant
there is no relative refractive index between more and less dense medium
Answer:
The correct option is;
Still constant
Explanation:
The relative refractive index ₁n₂ between the two medium can be as follows;
[tex]_1n_2 = \dfrac{The \ speed \ of \ light \ in \ medium \ 1}{The \ speed \ of \ light \ in \ medium \ 2} = \dfrac{c_1}{c_2}[/tex]
Therefore, given that the speed of light in medium 1 is constant and the speed of light on medium 2 is also constant, the relative refractive index ₁n₂ = c₁/c₂ is always constant.
Andre listed some properties of electromagnetic waves.
1) transfer thermal energy by radiation
2) can transfer energy over great distances
3) need matter to transfer energy through
4) are disturbances that carry energy
Which best describes Andre’s error?
Electromagnetic waves transfer thermal energy by conduction.
Electromagnetic waves can only transfer energy over short distances.
Electromagnetic waves can transfer energy through empty space.
Electromagnetic waves are not considered disturbances.
Answer: Electromagnetic waves can transfer energy through empty space.
Explanation:
Electromagnetic waves are formed when an electric field comes in contact with a magnetic field. The electric field and magnetic field of an electromagnetic wave are perpendicular to each other. They are also perpendicular to the direction of the wave.
Electromagnetic waves travel with speed of light in vacuum.
Electromagnetic wave does not need a medium to propagate or travel from one place to another. Electromagnetic waves are 'transverse' waves which means that they are measured by their amplitude and wavelength.
Electromagnetic waves do not lose energy when they travel and thus can travel far from its source.
Answer:
C.
Electromagnetic waves can transfer energy through empty space.
Explanation:
cause i dont need one
How can the speed of ripples in a ripple tank be changed
Answer:
By putting something like a sheet of glass in the water.
Explanation:
Putting a sheet of glass in the water will make the ripples move slower because the speed of a wave depends on the depth of water.
When your motivation is intrinsic, the process is more important than the __________.
result
weight loss
mindset
By comparing yourself to a standard of fitness, you will be able to see your natural ____________ and where there is room for improvement.
hobbies
strengths
interests
Information gives you the ____________ to change your body and your life.
power
ability
excitement
Your ____________________ is the number of beats per minute your heart needs during a workout.
resting heart rate
maximum heart rate
target heart rate
If you want to make something official, _____________!
write it down
visualize it
tell a friend
A state of being conscious, or aware, of something is called ________________.
activation
mindfulness
motivation
Flexibility is earned through regular ____________ and ____________.
effort and practice
effort and determination
hard work and new gym clothes
Answer:
1. result
2.strengths
3. power
4. target heartbeat
5. visualize it
6. mindfulness
7. effort and practice
tried my best not sure if #3 #5 and #7 is correct but I tried. How is it?
Answer:
i think its....A
Explanation:
What is the GPE of a ball with a mass of 2.3N that is sitting on top of a shelf 3.25m high?
Answer:
mgh = GPE
Explanation:
2.3×3.25
7.475J
Create a scenario that explains relative motion.