Answer:
B. 1200 J
Explanation:
Hello.
In this case, given the powers, we compute the energy transferred as shown below:
[tex]E=P*t\\\\E_1=60J/s*30s=1800J\\\\E_2=100J/s*30s=3000J\\\\Difference=3000J-1800J\\\\Difference=1200J[/tex]
Therefore, answer is B. 1200 J .
Best regards.
Discuss whether any work is being done by each of the following agents and, if so, whether the work is positive or negative: (a) a chicken scratching the ground no work positive work negative work (b) a person studying no work positive work negative work (c) a crane lifting a bucket of concrete no work positive work negative work (d) the gravitational force on the bucket of concrete no work positive work negative work (e) the leg muscles of a person in the act of sitting down no work positive work negative work
Answer:
a) As the chicken is still, the displacement is zero, which implies that the work is zero.
b) as the person is still there is no displacement therefore the work is zero
c) Lagraua applies a vertical force and the displacement is vertical, therefore the Work is positive
d) the force of gravity is directed downwards and the displacement is upwards, therefore the angle between it is 180º and the 180º fly is -1. Consequently the lock is negative
e) when the person meticulously feels the upward force and the displacement is downward, therefore the work is negative
Explanation:
Work is defined by the expression
W = F. r
bold letters indicate vectors, we can write this expression as a module
W= F r cos θ
where is at the angle between force and displacement.
Let's apply this expression to the different cases
a) As the chicken is still, the displacement is zero, which implies that the work is zero.
b) as the person is still there is no displacement therefore the work is zero
c) Lagraua applies a vertical force and the displacement is vertical, therefore the Work is positive
d) the force of gravity is directed downwards and the displacement is upwards, therefore the angle between it is 180º and the 180º fly is -1. Consequently the lock is negative
e) when the person meticulously feels the upward force and the displacement is downward, therefore the work is negative
Answer:(a)
Explanation:all they do is work work work work
The volume or intensity of a sound wave is measured by the size of the _________ and reported in decibels.
A) amplitude
B) frequency
C) trough
D) wavelength
A.) amplitude (amplitude equates to the volume of a sound wave, frequency equates to the note that is played)
Answer:
A. Amplitude
Explanation:
You’re exploring a cave. Standing in a low cavern, you steady yourself by pushing straight up on the rock ceiling. Identify the forces acting on you
Explanation:
The attached figure shows the free diagram of the person standing in a low cavern.
The forces acting on the person are as follows :
1. Its weight, mg (in downward direction)
2. F₁ = Force exerted by the Earth on the person (in upward direction)
3. F₂ = Force exerted by the ceiling on the person (in downward direction)
A box of mass 44 kg is pushed hard enough to set it in motion across a flat surface. The coefficient of kinetic friction between the box and the surface µk = 0.48. What minimum pushing force is needed to keep the box moving at a constant velocity?
a 231n
b 207n
c 178n
d 283n
Answer:
207
Explanation:
For the box to move at a constant velocity, the applied force must cancel the force due to kinetic friction.
F = mu_k * N
N = normal force = weight (= mg) if sliding horizontally
F = mu_k * mg = (0.48)(44 kg)(9.8 m/s^2) = 207 N
A plane stops from 250 mph in 25 seconds. Calculate the planes acceleration.
Answer:
The plane's acceleration is [tex]-4.47\ m/s^2[/tex]
Explanation:
Kinematics
Kinematics is the science that describes the motion of objects. When the motion has a constant speed, then it has zero acceleration, If the speed increases in time, the acceleration is positive, and if the speed decreases, the acceleration is negative.
The main formula for accelerated motion is:
[tex]v_f=v_o+a.t[/tex]
Where vf is the final speed of the object, vo is its initial speed, a is the acceleration, and t is the time.
The plane was moving at 250 mph and, in 25 seconds, it stopped. The data correspond to the following values of the variables:
vf = 0 (the plane stops)
vo= 250 mph. Since one mile is 1,609 m and 1 hour = 3,600 seconds:
[tex]250*1,609/3,600=111.74\ m/s[/tex]
t = 25 sec
We need to find the value of a. Solving for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}=\frac{0-111.74}{25}=-4.47\ m/s^2[/tex]
The plane's acceleration is [tex]-4.47\ m/s^2[/tex]
Pls help
A cup of hot chocolate has a spoon in it. How does the heat move from
the hot chocolate to the metal spoon handle?
Answer: It moves through conduction, because heat is transferred directly from the hot chocolate to the spoon.
Explanation:
An object becomes positively charged when it
A loses protons (P+)
B gains electrons (e-)
C gains neutrons (no)
D Oloses electrons (e-)
Answer:
D
Explanation:
Answer:
A
Explanation:
You found the distance that you will cover while braking. You can use the expected amount of time for braking to check your answer for distance.
Using the information given in the introduction and the value for distance that you found above, determine the time required for you to stop once you press the brakes. Note that the time for braking is just the time interval t3-t2.
This is the information given in the introduction:_______.
You are driving down the highway late one night at 20 m/swhen a deer steps onto the road 35m in front of you. Your reaction time before stepping on the brakes is 0.50s, and the maximum deceleration of your car is 10m/s2. How much distance is between you and the deer when you come to a stop?
Answer:
Explanation:
First we need to determine the distance covered during deceleration. According to the equation of motion.
S = ut+1/2at²
Given:
u = 20m/s
t = 0.50s
a = -10m/s (deceleration is negative acceleration)
S = 20²+1/2(-10)(0.5)²
S = 400-5(0.5)²
S = 400-5(0.25)
S = 400-1.25
S = 398.75m
If the deer steps onto the road 35m in front of you, the distance between you and the deer when you come to a stop will be 398.75-35 = 363.75m
100 POINTS AND BRAINLIST FOR BEST ANSWER!
Please help me i have a 77% in science and i need to bring it up today bc its the end of grades today. If you help me you are seriously the best person in the world, theres 4 questions.
Answer:
Air moves from regions of high pressure to regions of low pressure.
Explanation:
When airs moves horizontally from regions of high pressure to low pressure, it creates wind. If the difference between high and low pressure is greater, then it makes the wind faster.
Best of Luck!
Answer:
C. Air moves from regions of high pressure to regions of low pressure.
Explanation:
The air from the regions of high pressure will hold onto that pressure. So, when it moves into the regions with low pressure it'll turn into wind.
The greater the pressure, the stronger the wind and vise versa.
Hope this helps!
An object is moving to the right and experiencing a net force that is Directed to the right .the magnitude of force is decreasing with time the speed of object is
Answer:
hdggdskjn ijwzsa
Explanation:
What if boy A and boy B pull the heavy cabinet at the same time in opposite directions with 10N and 5N of force perspectively, what will be the net force on the cabinet?
Answer:
Explanation:
Boy b will win and cabinate will move in his direction
15 is maybe the net force
A force is a vector quantity, and the net force on an object is the vector sum of all the forces acting on the object
The net force on the cabinet is 5 Newtons in the direction boy A is pulling
The reason the net force value is correct is given as follows
The known parameter are;
Force with which boy A pulls the cabinet = 10 NForce with which boy B pulls the cabinet = 5 NThe direction boy B pulls the cabinet = Opposite direction to the direction boy A pulls the cabinetRequired:
The net force on the cabinet
Solution:
Let the vector form of the force applied by boy A, [tex]\overset \rightarrow {F_1}[/tex] = 10·i, therefore, the force applied by boy B in the opposite direction is, [tex]\overset \rightarrow {F_2}[/tex] = -5·i
The net force on the cabinet, [tex]F_{NET}[/tex] = [tex]\overset \rightarrow {F_1}[/tex] + [tex]\overset \rightarrow {F_2}[/tex], therefore;
[tex]F_{NET}[/tex] = 10·i - 5·i = 5·i
The net force on the cabinet, [tex]F_{NET}[/tex] = 5 Newton, in the direction of boy ALearn more about net force here:
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Jeff finds a pond during a nature walk, and he has some questions based on his observations of the pond.
Which question can he answer through a scientific investigation?
Which organisms are part of the food web in the pond?
How much money should be spent to make the pond more attractive?
Which pond animals would make the best pets?
Which plants in the pond are the prettiest in summer?
Answer:
Which organisms are part of the food web in the pond?
Explanation:
A "scientific investigation" is a method of looking for an answer with the help of a scientific method. It helps a person learn more about the world around him.
Since the scientific investigation only employs "measurable" observations, then the only question he can ask is the types of organisms (which is measurable) that belonged to the pond's food web. This question is more focused on observing the pond, unlike the other questions that talked about different things like money, having a pet and summer season–these are not directly observable and measurable in the current situation.
Answer: Which organisms are part of the food web in the pond?
Explanation:
Which changes involve forming or breaking chemical bonds?
Answer: burning and melting
Combustion (burning of molecules) is an exothermic oxidation-reduction reaction. When the combustion is intense, it results in a flame or an explosion (deflagration or detonation if the flame front exceeds the speed of sound).
This chemical reaction is a recombination of molecules. It goes through an intermediate step during which the molecules are "destructured" but not yet recombined; these are called radicals and are very reactive. In the case of combustion, the radicals are created by chemical bond breakage due to thermal energy, and they will be able to act on the molecules of the product (releasing other radicals) and thus generating a chain reaction that will continue as long as the following two conditions are met: presence of fuel and oxidizer.
Digestion is a food processing that is ingested into smaller particles that can or can not be assimilated by the body.
Explanation:
when a crystal of potassium permanganate is placed in the bottom of water in a beaker, the water in the whole Beaker turn purple on its own, even without stirring. This is an example of-
Calculate the Earth's linear momentum, in kilogram meters per second.
2. What is the momentum of a football of mass 500g traveling at a
velocity of 10m/s.
5 kg m/s
Salam Abatibor
Answer:
5000 ns
Explanation:
hope this helps
It took Lilly 7 seconds to ride her bike 35 meters to the end of the block.What was her speed?
Answer:
5 meters
Explanation:
Kyle is wondering what he is getting for his birthday. He decides to shake the box that contains his present. Kyle did not realize it, but he was acting like a scientist. What was the first step Kyle took in this situation that a scientist also takes?
Answer: Asking questions
Explanation:
Scientists always start with their question before
Observing anything
what is the slope of the line represent on a velocity vs time graph
Answer:
acceleration
Explanation:
Determine the velocity of a car that travels 28km in 2.2 hours
Answer:
velocity = 12.73 km/hr.Explanation:
velocity = distance / time
= 28 km
2.2 hr
= 12.73 km/hr.
Coach Wilkins drops a football from the top of the home bleachers at Tiger Stadium. If the stadium is 40.6 meters tall, how long did it take the ball to fall?
Answer:70.6 meters
Explanation:
A car is moving at 10 m/s and accelerates at 4 m/s2. How fast is the car going after 4
seconds?
Use the kinematics formula: [tex]v = v_0+at[/tex]
Your initial velocity is 10 m/s. Your acceleration is 4 m/s². The time elapsed is 4 s. And so,
[tex]v=10+4(4) \\v= 26 \text{ m/s}.[/tex]
state Boyle's law .Explain why this law may not apply in solids
Jasper and Gemma are going to play on a teeter totter. Gemma gets on first. When Jasper gets on, Gemma moves into the air, but she does not move to the top.
Which statement could correctly explain the forces acting on the teeter totter? assume that Jasper and Gemma are the same distance from one another.
The forces are balanced because Jasper weighs the same as Gemma.
The forces are unbalanced because Jasper weighs the same as Gemma.
The forces are balanced because Jasper weighs more than Gemma.
The forces are unbalanced because Jasper weighs more than Gemma.
Answer:
it will most likely be a: the forces are balanced because jasper weighs the same as gemma.
Explanation:
Answer:
The correct answer is A.) The forces are balanced because Jasper weighs the same as Gemma.
Explanation:
I just did the test on edge 2021 and got it right
_3. The type of philosophical reflection which trains the mind to think
logically. It is also the ability of the mind to construct and evaluate
arguments
A. Secondary reflection C. Primary reflection
B. Tertiary reflection D, all of the above
Answer:
C. Primary reflection
Explanation:
"Primary Reflection" is the type of philosophical reflection which trains the mind to think logically. It is also the ability of the mind to construct and evaluate arguments.
It's expressed in our ability to think logically; which means it's the ability for the mind to construct and evaluate arguments. It's an important tool when doing philosophy. It's the ability to express and support the claim of one rationally.
Primary reflection is used to examine its object by abstraction. It is usually concerned with technical solutions to problems.
The type of philosophical reflection which is responsible for training of mind is Primary reflection
Primary Reflection can be regarded as type of philosophical reflection which is responsible for the training of mind so the mind can think in a logical way.
Primary reflection can be regarded as important tool in philosophy and
It gives the mind the ability to construct as well as evaluate arguments.
It express the support of claim when it comes to rational mind and can be used in examination of object by abstraction.Therefore, Primary reflection can be regarded as ability that a mind has in construction and evaluation of argument.
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A car has momentum, p=10880 kg m/s, east. If the car is traveling east at 16 m/s, its mass must be [m] kg.
Answer:
The answer is 67.5 kgExplanation:
To find the mass of an object given it's momentum and velocity we use the formula
[tex]m = \frac{p}{v} \\ [/tex]
where
p is the momentum
v is the velocity
From the question
p = 1080 kgm/s
v = 16 m/s
We have
[tex]m = \frac{1080}{16} = \frac{135}{2} \\ [/tex]
We have the final answer as
67.5 kgHope this helps you
Momentum of car = 10880 kg m/s
Velocity of car = 16 m/s
To Find :We. have to find mass of the car[tex].[/tex]
Solution :★ Momentum of body is measured as the product of mass and its velocity.
It is a vector quantity having both magnitude as well as direction.
SI unit : kg m/s or N s
Formula : p = m × v
p denotes momentumm denotes massv denotes velocity★ Calculation :
⭆ p = m × v
⭆ 10880 = m × 16
⭆ m = 10880/16
⭆ m = 680 kg
∴ Mass of the car = 680 kg
Hope It Helps!A race car exerts 18,344 N while the car travels at an acceleration of 92.54 m/s2. What is the mass of the car? (Use the formula m=F/a)
Answer:
The answer is 198.23 kgExplanation:
To find the mass of an object given it's mass and acceleration we use the formula
[tex]m = \frac{f}{a} \\ [/tex]
where
m is the mass
F is the force
a is the acceleration
From the question
a = 92.54 m/s²
F = 18,344 N
We have
[tex]m = \frac{18344}{92.54} \\ = 198.2277933...[/tex]
We have the final answer as
198.23 kgHope this helps you
A car traveling at a velocity of 40 m/s accelerates at 5 m/s/s for 10 seconds. What is the car's final velocity?
Answer:
The answer is 90 m/sExplanation:
To find the final velocity of an object given it's initial velocity , time taken and it's acceleration we use the formula
v = u + atwhere
v is the final velocity
u is the initial velocity
t is the time taken
a is the acceleration
From the question
u = 40 m/s
t = 10s
a = 5 m/s²
We have
v = 40 + 5(10) = 40 + 50
We have the final answer as
90 m/sHope this helps you
The Kentucky Derby is one of the most exciting horse races run every year. In 1973, the horse Secretariat set a record that still stands. This 500-kg horse ran the 2000-m track in 120 s. What was Secretariat’s average kinetic energy? (1 kJ = 1000 J)
A. 4.2 kJ
B. 8.3 kJ
C. 69.0 kJ
D. 139.0 kJ
Answer:
C. 69.0 kJ
Explanation:
Step 1: Given data
Mass of the horse (m): 500 kg
Distance traveled by the horse (d): 2000 m
Time elapsed (t): 120 s
Step 2: Calculate the speed of the horse (v)
The speed of the horse is equal to the distance traveled divided by the time elapsed.
v = d/t
v = 2000 m/120 s
v = 16.6 m/s
Step 3: Calculate the kinetic energy (K) of the horse
We will use the following expression.
K = 1/2 × m × v²
K = 1/2 × 500 kg × (16.6 m/s)²
K = 6.90 × 10⁴ J
Step 4: Convert "K" to kJ
We will use the conversion factor 1 kJ = 1000 J.
6.90 × 10⁴ J × (1 kJ/1000 J) = 69.0 kJ
The average kinetic energy is option C. 69.0 kJ
Calculation of the average kinetic energy:But before that we have to do following calculations:
The Mass of the horse = (m)= 500 kg
The Distance traveled by the horse= (d)= 2000 m
And, Time elapsed (t) = 120 s
Now the speed of the horse (v) should be
v = d/t
= 2000 m/120 s
= 16.6 m/s
Now kinetic energy (K) of the horse should be
K = 1/2 × m × v²
K = 1/2 × 500 kg × (16.6 m/s)²
K = 6.90 × 10⁴ J
Now we have to Convert "K" to kJ
Since 1 kJ = 1000 J.
So,
= 6.90 × 10⁴ J × (1 kJ/1000 J)
= 69.0 kJ
hence, The average kinetic energy is option C. 69.0 kJ
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Joe walked 8 meters from his seat to his teacher's desk to turn in an assignment. On
the way back to his seat Joe stops and talks to Sarah. Sarah's desk is in the front row,
exactly 2 meters from the teacher's desk. What is Joe's displacement in meters?
Answer: Joe's displacement is 6
Step-by-step explanation:
8-2=6
The displacement of Joe for the entire journey is 6 m backwards.
The given parameters;
fist position of Joe, x₁ = 8 mfinal position of Joe, x₂ = 2 mDisplacement is the change in the position of an object. It can also be described as the shortest distance between the final position and the initial position.
Displacement = Δx = x₂ - x₁
Let the forward direction be negativeLet the backward direction be positiveDisplacement = -2 - (-8)
Displacement = -2 + 8
Displacement = 6 m backwards
Thus, the displacement of Joe for the entire journey is 6 m backwards.
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