Answer:
P = 45 [kW]
Explanation:
We must find the difference in kinetic energy during the 20 seconds.
[tex]D_{kE}=2.5-1.6\\D_{kE}=0.9[MJ][/tex]
Power is defined as the relationship between energy over time.
[tex]P=D_{kE}/t\\P=0.9/20\\P=0.045[MW] or 45 [kW][/tex]
What kind of energy involves the flow of negative charges?
Answer: static electricity
Explanation: The movement of charged particles through a wire or other medium is called current or electricity. There is also static electricity, which results from an imbalance or separation of the positive and negative charges on an object. Static electricity is a form of electrical potential energy
2 What can you Infer about this source of electricity?
A It is a source of alternating current
B It Is a source of direct current
С It is a source of static electricity
D It is a source of electromagnetic radiatlon
Answer:i think it's d
Explanation:
Give a paragraph on how to become a better leader
Answer:
Anyone can sit in a corner office and delegate tasks, but there is more to effective leadership than that. Effective leaders have major impacts on not only the team members they manage, but also their company as a whole. Employees who work under great leaders tend to be happier, more productive and more connected to their organization – and this has a ripple effect that reaches your business's bottom line
Explanation:
:)
An 800 kHz radio signal is detected at a point 3.2 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 320 mV/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. The magnetic field amplitude of the signal at that point, in nT, is closest to:
Answer:
1.07 nT
Explanation:
We know that E/B = c where E = electric field amplitude = 320 mV/m = 0.32 V/m, B = magnetic field amplitude and c = speed of light = 3 × 10⁸ m/s.
So, B = E/c
Substituting E and c into B, we have
B = E/c
= 0.32 V/m ÷ 3 × 10⁸ m/s
= 0.1067 × 10⁻⁸ T
= 1.067 × 10⁻⁹ T
= 1.067 nT
≅ 1.07 nT
A block has a length of 1.0 cm, a width of 3.1 cm, and a height of 2.5 cm. What is the block's volume to the nearest tenth?
Answer:
8
Explanation:
1.0 × 3.1 × 2.5 = 7.75 cm^3
nearest tenth 8cm^3
a truck of mass 200kg rests on an inclined plane hindered from rolling down the surface by a storing sprint whose force constant is 10^6N/M.neglecting friction,how much work does the truck do on the spring?
Answer:
1.92 J
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 200 Kg
Spring constant (K) = 10⁶ N/m
Workdone =?
Next, we shall determine the force exerted on the spring. This can be obtained as follow:
Mass (m) = 200 Kg
Acceleration due to gravity (g) = 9.8 m/s²
Force (F) =?
F = m × g
F = 200 × 9.8
F = 1960 N
Next we shall determine the extent to which the spring stretches. This can be obtained as follow:
Spring constant (K) = 10⁶ N/m
Force (F) = 1960 N
Extention (e) =?
F = Ke
1960 = 10⁶ × e
Divide both side by 10⁶
e = 1960 / 10⁶
e = 0.00196 m
Finally, we shall determine energy (Workdone) on the spring as follow:
Spring constant (K) = 10⁶ N/m
Extention (e) = 0.00196 m
Energy (E) =?
E = ½Ke²
E = ½ × 10⁶ × (0.00196)²
E = 1.92 J
Therefore, the Workdone on the spring is 1.92 J
Michael is biking on a trail and is accelerating at a rate of 1.2 m/s/s for 15 seconds. He began this part of his ride with a velocity of 1.62 m/s. Determine Michael's final velocity?
Answer:
Michael's final velocity is 19.62 m/s.
Explanation:
We can find the final velocity of Michael by using the following kinematic equation:
[tex] v_{f} = v_{0} + at [/tex] (1)
Where:
[tex]v_{f}[/tex]: is the final velocity =?
[tex]v_{0}[/tex]: is the initial velocity = 1.62 m/s
a: is the acceleration = 1.2 m/s²
t: is the time = 15 s
By entering the above values into equation (1) we have:
[tex] v_{f} = 1.62 m/s + 1.2 m/s^{2}*15 s [/tex]
[tex] v_{f} = 19.62 m/s [/tex]
Therefore, Michael's final velocity is 19.62 m/s.
I hope it helps you!
A container is filled with liquid the depth of the liquid is 60 CM if exertingc in pressure is 2000pa. calculator the density of a liquid
Answer:
The density of the liquid is 340.136 kg/m³
Explanation:
Given;
depth of liquid in the container, h = 60 cm = 0.6 m
pressure of the liquid, P = 2000 Pa = 2000 N/m²
The pressure of the liquid is calculated as ;
P = ρgh
where;
ρ is density of the liquid
g is acceleration due to gravity = 9.8 m/s²
h is depth of the liquid
Make the density (ρ) the subject of the formula;
[tex]\rho = \frac{P}{gh} \\\\\rho = \frac{2000}{9.8 \times 0.6}\\\\\rho = 340.136 \ kg/m^3[/tex]
Therefore, the density of the liquid is 340.136 kg/m³
Describe the 3 types of collisions. Then explain how they are alike and different.
A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest
Options are;
(a) the red beam
(b) the violet beam
(c) it is the same for both beams
(d) cannot answer this without knowing the light intensity
Answer:
A: Red Beam
Explanation:
The energy of a photon is given by the formula;
E = hc/λ
Where;
h is Planck's constant
c is speed of light
λ is wavelength
From online sources, wavelength of red light is greater than that of violet.
Thus, it means that the value of E for red light will be lesser than that of violet since the denominator under red light will be larger. Therefore, the beam of red light will have the greatest number of photons hitting the surface per second.
The Planck's equation and the definition of power allow you to find the result for which beam has the largest number of photons is:
The red beam has more photons than the violet beam.
The energy of a photon is given by the Planck's equation.
E = h f
Where h is the Planck constant and f the frequency.
The speed of light is related to wavelength and frequency.
c = λ f
f = [tex]\frac{c}{\lambda }[/tex]
Let's substitute
E = [tex]\frac{hc}{\lambda}[/tex]
Power is defined as energy per unit of time.
P = W / t
P t = W
The wavelength of red light, in the order of 700 nm, is greater than the wavelength of violet light, which is on the order of 400 nm, therefore the energy of a photon of red light is less than the energy of a photon of violet light.
[tex]E_{red} < E_{violet}[/tex]
The total energy deposited is the number of photons times the energy of each photons.
W = [tex]#_{photons} \ E_o[/tex]
They indicate that the power delivered by the two rays is the same.
[tex]P_{red} = P_{violet}[/tex]
#_ {red photons} [tex]E_{o \ red}[/tex]d = #_{photons violet} [tex]E_{o \ violet}[/tex]
[tex]number_{red \ photons} = \frac{E_{violet}}{E_{red}} \ number _{violet \ photons}[/tex]
The amount of energy of the violet photons is greater than the amount of energy of the red photons.
[tex]\frac{E_{violet}}{E_{red}} > 1[/tex]
Consequently, to leave the same power, there must be more red photons than violet wavelength photons.
In conclusion, using Planck's equation and the definition of power, we can find the result for which beam has the greatest number of photons is:
The red beam has more photons than the violet beam.
Learn more here: brainly.com/question/5528489
Example of first, second and third law of motion.
Examples of Newton's three law of motion.
First law of motion: A rocket being launched up in the atmosphere.
Second law of motion:while riding a bicycle, a bicycle acts as a mass and our legs pushing on the pedals of the bicycle is the force.
Third law of motion:when we jump off from the boat,the boat moves backward.
Hope,it will helpyouu!
the force measuring instrument is called
Answer:
A force gauge (also called a force meter) is a measuring instrument used to measure forces. Applications exist in research and development, laboratory, quality, production and field environment. There are two kinds of force gauges today: mechanical and digital force gauges.
[tex]x3n + 5x2n + 12xn + 18 \div xn + 3[/tex]
Answer:
sorry its impossible
Explanation:
state Newton second law of motion
Newton 2ns law state that external forces that exert on an object is proportional to the mass and the acceleration of an object
Formula : ΣF = ma
ask me if you're confused with my answer
You have to travel 5000 meters. You only have two minutes (120 seconds) to get there. How fast must you travel to get there in time in meters per second?
Answer:
416.667 m/s
Explanation:
divide the distance by the time
A book weighing 2 Newtons is at rest on a table. The net force on the book is zero.
TRUE
FALSE
Answer: I think its True
The vertical (top to bottom) parts of periodic table are called groups or
your stopped at a red light. You've checked the intersection to see that it is clear of vehicles and pedestrians, unless a tells you not, you may then?
Answer:
Unless you are at a red light you may not proceedYou pose a threat to other drivers who are following the instructions and ethics.10 cm^3 of iron have a smaller
mass then 115 cm^3 of wood.
(density of iron 7.9 g/cm^3)
(density of wood 0.7 g/cm^3)
true or false
Explanation:
Mass of iron = (7.9)(10) = 79g
Mass of wood = (115)(0.7) = 80.5g
Therefore iron has a smaller mass than the wood, which is true.
A race car moves along a circular track at a speed of 0.512 m/s. If the car's centripetal acceleration is 15.4 m/s2, what is the distance between the car and the center of the track?
Answer:
The radius is [tex]r = 0.0170 \ m[/tex]
Explanation:
From the question we are told that
The speed at which the race car moves is [tex]v = 0.512 \ m/s[/tex]
The centripetal acceleration is [tex]a _r = 15.4 \ m/s[/tex]
Generally the centripetal acceleration is mathematically represented as
[tex]a_r = \frac{v^2 }{r}[/tex]
=> [tex]15.4 = \frac{0.512^2 }{ r}[/tex]
=> [tex]r = 0.0170 \ m[/tex]
Fossils, plants, and animals are what make rocks different from minerals.
true of fales
Francine is standing on the edge of a cliff. She determines that she has 6615J of gravitational potential energy relative to the bottom of the cliff. If she has a mass of 45kg, how high is the cliff?
Answer:
h = 14.98 [m]
Explanation:
We can calculate this height using the definition of potential energy, which tells us that this energy is equal to the product of mass by gravitational acceleration by height. In this way we can find the height, by means of the following equation:
[tex]E_{pot}=m*g*h[/tex]
where:
Epot = potential energy = 6615 [J]
m = mass = 45 [kg]
g = gravity acceleration = 9.81 [m/s²]
h = elevation [m]
[tex]6615 = 45*9.81*h\\h = 14.98 [m][/tex]
Use the drop-down menus to determine which state of matter is described in each statement.
The atoms in a
are closely packed, but able to slide past each other.
The atoms in a
spread as far apart as possible.
A
has a definite shape and volume.
The shape of a
can change, but the volume is definite.
Answer:
Explanation:
There are three states of matter; solid, liquid and gaseous states.
The solid state of matter has it's particles tightly packed with very restricted or no movement within the molecule hence the reason for it's definite shape.
The liquid state of matter has it's particles with a free movement (better than solid but not as free as gases) within the molecule hence it's particles are loosely packed within the molecule. Hence, they (liquids) assume the shape of the container in which they are stored and they move freely when released from the container.
The gaseous state of matter has it's particles totally loosely packed as a result of it's particles moving freely and colliding against one another.
Thus, we can use the above descriptions to answer the statements from the question.
1) The atoms in a ----- are closely packed, but able to slide past each other. Answer: From the description above, it can be deduced that the atoms here are in a solid because the particles within a solid are closely packed.
2) The atoms in a -------- spread as far apart as possible.
Answer: The atoms here are in gaseous form because, as described earlier, they are loosely packed and can thus be as far apart as possible.
3) A ----- has a definite shape and volume.
Answer: As described earlier, a solid substance would have a definite shape and volume because it's particles are tightly packed.
4) The shape of a ----- can change, but the volume is definite.
Answer: The substance here is a liquid because the particles are free (but not as free as gases) and would have a definite volume but will assume the shape of the any container they are placed in (hence they have an irregular shape).
Answer:
The atoms in a
✔ liquid
are closely packed, but able to slide past each other.
The atoms in a
✔ gas
spread as far apart as possible.
A
✔ solid
has a definite shape and volume.
The shape of a
✔ liquid
can change, but the volume is definite.
Explanation:
An object located near the surface of Earth has a weight of a 245 N
object?
• What is the mass of the object?
• What is the weight of the object on Mars where the gravity is
3.72 m/s?
Answer:
The mass of the object is 24.5 kg and weight of the object on Mars is 91.14 N.
Explanation:
Weight of the object on the surface of Earth, W = 245 N
On the surface of Earth, acceleration due to gravity, g = 10 m/s²
Weight of an object is given by :
W = mg
m is mass
[tex]m=\dfrac{W}{g}\\\\m=\dfrac{245\ N}{10\ m/s^2}\\\\=24.5\ kg[/tex]
So, the mass of the object is 24.5 kg
Acceleration due to gravity on Mars, g' = 3.72 m/s²
Weight of the object on Mars,
W' =mg'
W' = 24.5 kg × 3.72 m/s²
= 91.14 N
So, the weight of the object on Mars is 91.14 N.
Given the data in the question;
Weight of object; [tex]W = 245N[/tex]
What is the mass of the object.Weight the measure of the force of gravity pulling down on a particle or object.
It is expressed as:
[tex]W = m* g[/tex]
Where m is mass of the object and g is acceleration due to gravity { Acceleration due gravity of Earth [tex]g_{earth} = 9.8m/s^2[/tex] }
We substitute our values into the equation
[tex]245N = m * 9.8m/s^2\\\\245kg.m/s^2 = m * 9.8m/s^2\\\\m = \frac{245kg.m/s^2}{9.8m/s^2} \\\\m = 25kg[/tex]
Therefore, mass of the object located near the Earth surface is 25kg
Weight of the object on Mars where the gravity [tex]3.72m/s^2[/tex]
So on planet Mars; [tex]g = 3.72m/s^2[/tex], we know that mass of the object is [tex]25kg[/tex]
We substitute into our equation
[tex]W = m* g[/tex]
[tex]W = 25kg * 3.72m/s^2\\\\W = 93kg.m/s^2\\\\W = 93N[/tex]
Therefore, the weight of the object on Mars with the given gravity is 93 Newtons.
Learn more: https://brainly.com/question/23245710
Potassium chloride forms a solid made up of a highly organized set of
positive and negative particles. Which term describes this solid?
A. An ion
B. A crystal
C. An atom
D. A molecule
Answer: It is b. a crystal
Explanation:
Answer:
B. A crystal
Explanation:
What is the random walk?
Answer:
In mathematics, a random walk is a mathematical object, known as a stochastic or random process, that describes a path that consists of a succession of random steps on some mathematical space such as the integers.
Explanation:
A 750 g ball is raised 3 m off the ground and then thrown. What is the potential energy
of the ball before the throw?
Answer:
22.05 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass in kg
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question
750 g = 0.75 kg
We have
PE = 0.75 × 9.8 × 3
We have the final answer as
22.05 JHope this helps you
help please 10 pts and quick!
can someone write me a short response
Answer:
Explanation:
Pecan 1 and 4 seem the best answer
A bullet of mass 4.0g is fired from a rifle of mass 2.0kg with muzzle velocity of 380m/s. What is the initial recoil velocity of the rifle?
Answer:
v = 0.76 [m/s]
Explanation:
The linear momentum generated by the shot must be calculated. This can be calculated using the following expression.
[tex]P=m*v\\[/tex]
where:
P = linear momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
[tex]P=0.004*380\\P=1.52[kg*m/s][/tex]
Now we can calculate the recoil velocity, because the momentum is equal for the rifle.
[tex]P=m*v\\v = P/m\\v = 1.52/2\\v = 0.76[m/s][/tex]
An airplane flies at 40 m/s at an altitude of 50 meters. The pilot drops a heavy package which falls to the ground. Where, approximately, does the package land relative to the plane's new position
Answer:
128 m
Explanation:
From the question given above, the following data were obtained:
Horizontal velocity (u) = 40 m/s
Height (h) = 50 m
Acceleration due to gravity (g) = 9.8 m/s²
Horizontal distance (s) =?
Next, we shall determine the time taken for the package to get to the ground.
This can be obtained as follow:
Height (h) = 50 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
50 = ½ × 9.8 × t²
50 = 4.9 × t²
Divide both side by 4.9
t² = 50 / 4.9
t² = 10.2
Take the square root of both side
t = √10.2
t = 3.2 s
Finally, we shall determine where the package lands by calculating the horizontal distance travelled by the package after being dropped from the plane. This can be obtained as follow:
Horizontal velocity (u) = 40 m/s
Time (t) = 3.2 s
Horizontal distance (s) =?
s = ut
s = 40 × 3.2
s = 128 m
Therefore, the package will land at 128 m relative to the plane