Answer:
Change in kinetic energy = 3297280 J
Explanation:
Given that,
Mass, m = 920 kg
Speed of a car, v = 92 m/s
Kinetic energy, K = 3,893,440 J
If the speed of a car, V = 36 m/s
Net kinetic energy is given by :
[tex]K_n=\dfrac{1}{2}mV^2\\\\=\dfrac{1}{2}\times 920\times (36)^2\\\\K_n=596160\ J[/tex]
The change in kinetic energy = 3,893,440 - 596160
= 3297280 J
So, the change in kinetic energy of the car is 3297280 J.
Calculate how much steam from water boiling at 100 C will just melt 50 gm of wax at 20 C. (Melting point of wax=55 C, sp. heat capacity of wax=0.7cal/g C, sp. latent heat of fusion of wax=35cal/g)
Answer:
m₁ = 5.507 x 10⁻³ kg = 5.507 g
Explanation:
The heat released by the steam must be absorbed by the melting wax, according to the law of conservation of energy:
Heat Released by Steam = Heat Absorbed by Wax
Latent Heat of Fusion of Steam = Heat Absorbed by Wax + Latent Heat of Fusion of Wax
m₁H₁ = m₂CΔT₂ + m₂H₂
where,
m₁ = mass of water = ?
H₁ = Latent Heat of Fusion of Water = 2260 KJ/kg = 2.26 x 10⁶ J/kg
m₂ = mass of wax = 50 g = 0.05 kg
C = specific heat capacity of wax = (0.7 cal/g°C)(1000 g/1 kg)(4.184 J/1 Cal)
C = 2928.8 J/kg.°C
ΔT₂ = Change in Temperature of Wax = 55°C - 20°C = 35°C
H₂ = Latent Heat of Fusion of Wax = (35 cal/g)(1000 g/1 kg)(4.184 J/1 Cal)
H₂ = 146440 J/kg
Therefore,
m₁(2.26 x 10⁶ J/kg) = (0.05 kg)(2928.8 J/kg.°C)(35°C) + (0.05 kg)(146440 J/kg)
m₁ = (5125.4 J + 7322 J)/2.26 x 10⁶ J/kg
m₁ = 5.507 x 10⁻³ kg = 5.507 g
what's computer software, give the types of computer software with 5 examples each
Answer:
The system software is a collection of programs designed to operate, control, and extend the processing capabilities of the computer itself. System software serves, the interface between the hardware and the end users. Some examples of system software are Operating System, Compilers, Interpreter, Assemblers.
Explanation:
A computer software is a collection of computer programs that provides instructions for a computer on what to do and how to do it. There are two types of software:
1. System Software 2. Application software
1. System software controls the various operations performed by the computer hardware. It helps the user operate the computer system.
2. An application software is used to perform operations for a specific task.
Which of the following describes air temperature and air pressure at higher altitudes?
Group of answer choices:
Air temperature increase while air pressure decreases
Air temperature and air pressure both decrease
Air temperature and air pressure both increase
Air temperature decreases while air pressure increases
Answer:
Air temperature and air pressure both decreases
Answer: A
Explanation:
An object with a mass of 5kg accelerates 20m/s" when an unknown force is applied. What is the amount of force?
please help!!
Answer:
100 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 5 × 20
We have the final answer as
100 NHope this helps you
Why do we close our eyes when we sleep
Answer:
because our some of the energy goes from our eyes
explanation;
There are several reasons why it's important to close our eyes while we sleep. Closed eyelids block light, which stimulates the brain to wakefulness. Closing our eyes also protects and lubricates the eyes while we sleep
If a dog ran at 5 m/s how far would it run in 45 s
Answer:
225 m//s
Explanation:
It ran 5m/s so 5x45=225
Answer:
225 meters
Explanation:
If it is running 5 meters per seconds, and it ran 45 seconds, you would need to multiple the seconds it ran by the speed per second: 5 • 45
5 • 45 = 225
The other name for 'net force' is 'unbalanced force'. What is the name of the force that could be applied to an object that would balance a net force and create a state of equilibrium?
Answer:
Since these two forces are of equal magnitude and in opposite directions, they balance each other. The book is said to be at equilibrium. There is no unbalanced force acting upon the book and thus the book maintains its state of motion. When all the forces acting upon an object balance each other, the object will be at equilibrium; it will not accelerate.
Explanation:
I am unsure about what I'm suppose to do
Answer:
1st box: increase
supporting evidence: As the girl swings downward she will gain more height due to the increasing force pushing her
2nd box: increase
supporting evidence: the magnetic force of the earth will increase the kinetic energy of the girl when she goes downward slightly as she swings forward
3rd box :increase
supporting evidence:As the girl swings downward she will gain more speed due to the gravitational pull
Explanation:
What is the Energy Transformation of an electric radiant heater?
Answer:
energy transfer electric to heat
A baseball is hit with 114 newtons has a mass of 0.145kg. What is the acceleration of the baseball?
Answer:
786.2m/s²
Explanation:
Given parameters:
Force = 114N
Mass = 0.145kg
Unknown:
Acceleration of the baseball = ?
Solution:
According to newton's second law of motion, the product of mass and acceleration is the net force on the body;
Force = mass x acceleration
Insert the parameters and find the acceleration;
114 = 0.145 x acceleration
Acceleration = [tex]\frac{114}{0.145}[/tex] = 786.2m/s²
Why sonic the hedgehog its so broken in power?
Answer:
Because of the perpindicularity of the bisectors reacting with the photosynthesis of the lines.
Explanation:
Answer:
it`s quite simple
Explanation
he can use the chao esmeralds and the chaos esmeralds holds a lot of energy what makes he stronger and more quick
Calculate the average time it took the car to travel 0.25 and 0.50 meters with four washers attached to the pulley. Record the averages, rounded to two decimal places, in Table C of your Student Guide.
What is the average time it took the car to travel 0.25 meters?
seconds
What is the average time it took the car to travel 0.50 meters?
seconds
Answer:
0.88 seconds
1.33 seconds
on edge (when four washers are attached)
Explanation:
Answer:
0.88 seconds
1.33 seconds
Explanation:
What is the main function of a cell
Answer:
they provide structure and support, facilitate growth through mitosis, allow passive and active transport, produce energy, create metabolic reactions and aid in reproduction.
Explanation:
they provide six main functions.
Question 4 What is the standard Hz rate (cycles per second) in the US? 60 Hz 20 Hz 50 Hz 80 Hz
The standard in the United States is 120-volt and 60Hz AC electricity.
Answer:
120-volt and 60Hz AC electricity.
Explanation:
what is the definition for scientific model?
Answer:
Explanation:
Scientific modelling is a scientific activity, the aim of which is to make a particular part or feature of the world easier to understand, define, quantify, visualize, or simulate by referencing it to existing and usually commonly accepted knowledge.
how long does it take a 5kW shower to use 25000J of energy?
Explanation:
p=5kw=5000w t=? p=w/t, t=w/p
w=25000j t=25000j/5000w
=5s
Explain the difference between a government Law and a Law of Science
Answer:
U.S. Federal Government Law addresses government interactions on a national scale, and is largely composed of administrative law and constitutional law. ... State law also establishes and regulates local government for cities, towns, counties, and other communities.In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory
Explanation:
In a chemical reaction, molecules of hydrogen gas (H2) react with molecules of oxygen gas (O2) in a sealed reaction chamber to produce water (H2O). This occurs through the following chemical equation. 2H2 + O2 → 2H2O What is conserved as the reaction occurs in the reaction chamber? A. temperature B. mass C. flammability D. molecule size
Answer:
Option (B) is correct.
Explanation:
Given that the molecules of hydrogen gas ([tex]H_2[/tex]) react with molecules of oxygen gas ([tex]O_2[/tex]) in a sealed reaction chamber to produce water ([tex]H_2O[/tex]).
The governing equation for the reaction is
[tex]2H_2 +O_2 \rightarrow 2H_2O[/tex]
From the given, the only fact that can be observed that 2 moles of [tex]H_2[/tex] and 1 mole of [tex]O_2[/tex] reacts to produce 2 moles of [tex]H_2O[/tex].
As the mass of 1 mole of [tex]H_2 = 2[/tex] grams ... (i)
The mass of 1 mole of [tex]O_2 = 32[/tex] grams ...(ii)
The mass of 1 mole of [tex]H_2O = 18[/tex] grams (iii)
Now, the mass of the reactant = Mass of 2 moles of [tex]H_2[/tex] + mass 1 mole of [tex]O_2[/tex]
[tex]= 2 \times 2 + 32[/tex] [ using equations (i) and (ii)]
[tex]=4+32 = 36[/tex] grams.
Mass of the product = Mass of 2 moles of [tex]H_2O[/tex]
[tex]=2\times 18[/tex] [ using equations (iii)]
=36 grams
As the mass of reactants = mass of the product.
So, mass is conserved.
Hence, option (B) is correct.
If F applied is 17 Newtons to the right, what is the magnitude and direction of the friction force, if the object is traveling with the constant velocity?
Find friction force and its direction
There's some missing context here, but I would guess you're talking about a box or something with some mass m being pushed over a flat surface. Since it's moving with constant velocity, there is no acceleration and so the box is in equilibrium. In particular, the horizontal forces cancel each other. If f is the magnitude of the friction force, then
17 N + (-f ) = 0
f = 17 N
and this force points opposite the direction of motion.
Select all that apply.
Which of the following is a valid reason why females are underrepresented in STEM jobs?
Females like technology and science, but they are not confident in their mathematics abilities.
Females are more likely to pursue STEM education in societies where females have STEM jobs.
Females like to study STEM subjects, but they do not want to work in STEM jobs.
Females are not as competent as males in mathematics, science, and technology.
Answer:
Its most likely answer number 2
Answer:
Females like technology and science, but they are not confident in their mathematics abilities.
and
Females are more likely to pursue STEM education in societies where females have STEM jobs.
Im doing this assignment right now
Which of Newton’s laws explains why your hands get red when you press them hard against a wall.
Answer:
Newton's third law, if i'm not mistaken.
Explanation:
Any action that occurs will have a opposite and equal action. The greater the force u apply to the wall, the greater the force the wall exerts back at you, hence why ur hands become red if u try pushing extremely hard on the wall.
Sam lifted his backpack with 5 Newtons of force a total of 400
meters. How much work did he do?
80 watts
2000 watts
2000 joules
80 joules
2000joules
Explanation:
work done=force×meters
if your smart in science please help me, thank u
Answer:
Air steel water
Explanation:
You are standing at the top of a high cliff. You drop a rock and it hits the ground 4 seconds later. How fast was it going when it hits the ground?
A. -9.8 m/s
B. -38.2 m/s
C. -29.4 m/s
D. -19.6 m/s
Answer:
B. -38.2 m/s
Explanation:
Given parameters:
Time of fall = 4s
Unknown:
Final velocity of the rock = ?
Solution:
To solve this problem, we use the expression below;
V = U + gt
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity = 9.8m/s²
t is the time taken
Now, insert the parameters and solve;
V = 0 + (9.8 x 4) = 39.2m/s
Need done ASAP! A golf ball with a mass of 200g leaves the ground with an initial velocity of 50m/s what is the maximum gravitational store of the ball when it reaches its highest point ?
Answer:
10 m
Explanation:
200 g convert to kg = 0.2 kg
v = 50 m/s
F= ma
= 0.2(50)
= 10
The mechanical energy of a coconut falling from a tree______
A. doesn't exist
B. increases
C. decreases
D. remains constant
Answer:
D. is the answer
Explanation:
Answer:
D
Explanation:
PLEASE ANSWER
15. A 20-kilogram monkey hangs from a tree limb by both arms. Draw a free-body diagram showing the forces on the monkey. Hint: 20 kilograms is not a force!
Answer:
Farm = 98.1 [N]
Explanation:
To solve this problem we must draw the respective free body diagram, with the forces acting on the monkey. An analysis of the sums on the y-axis must be performed, in this axis the weight is acting down and the forces of both arms pulling up.
Weight is defined as the product of mass by gravitational acceleration.
W = m*g
where:
m = mass = 20 [kg]
g = gravity acceleration = 9.81 [m/s²]
W = 196.2 [N] (units of Newtons)
As this force points down, the force of both arms must go up, therefore each arm exerts a force of:
Farm = 196.2 / 2
Farm = 98.1 [N]
The purpose of concept-mapping is to
a. Identify sequence
b. Identify vocabulary
c. Identify relationships
d. Identify questions
Please select the best answer from the choices provided
Ο Α
OB
ОС
OD
Answer:
c. Identify relationships
Explanation:
One of the most important feature of concept-mapping is to identify relationships between the phenomenon being mapped.
Concept map is the process of using shapes, colors and lines to represent a person's thought process. Concept maps are very useful study aids. They present the relationship between different part of a study.Answer:
its a... i have seen one for every letter lol
Explanation:
What is the work done if you push a tree with
50 N of force but the tree does not move?
Answer:
The work done is 0.
Explanation:
The reason no work is done is because the equation W = Fs.
W = work
F= force
s= displacement
In this scenario F = 50 and s= 0
Therefore.
W = 50(0)
W = 0
Fiber is not easily digested by the body.
True
False
Answer:
true
Explanation:
Answer:
Is Falseeee
Explanation:
Hope it helps
