Answer:
power can be expressed as P=work/change in time,instead of P=change of energy/change in time because the change of energy is basically the work done.
Answer:
P=W/T....is the answer
What is the net force on a refrigerator that you push with an applied force of 125 N to the right and the (sliding) friction between the floor and the fridge is 95 N to the left? (b) As you increase the force applied to the fridge, will the friction force also increase? Explain. Hint: remember the force of friction between solid surfaces does not depend on speed
Answer:
hola
Explanation:
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An old lorry is 20% efficient at converting the
chemical energy in the diesel into useful
mechanical energy. How many joules of
mechanical energy are produced when 600
joules of chemical energy have been used by
the engine?
Answer:
The amount of mechanical energy produced by the old lorry when 600 Joules of chemical energy have been used by the engine, M.E. is 120 Joules
Explanation:
The question is a word problem on the relationship between energy efficiency and energy consumption
The given parameters of the old lorry are;
The chemical energy to mechanical energy conversion efficiency of the old lorry = 20%
The amount of chemical energy used by the engine = 600 joules
Let 'M.E.' represent the amount of mechanical energy produced by the old lorry, we have;
[tex]Energy \ Efficiency = \dfrac{Energy \ produced }{Total \ Energy \ Taken \ In \ or \ Used} \times 100[/tex]
Therefore, the for the old lorry, we have;
[tex]20\% = \dfrac{M.E. \ Produced}{600 \ Joules} \times 100[/tex]
∴ M.E. Produced = 20/100 × 600 J = 120 J
The amount of mechanical energy produced by the old lorry when 600 Joules of chemical energy have been used by the engine, M.E. = 120 Joules
If you are at the top of a hill on a roller coaster at rest and you are able to complete a loop with a radius of 30 m,
a) find the minimum speed to complete the loop (hint: this is a circular motion problem)
b) find the minimum height of the hill to complete the loop
Answer:
Explanation:
People are wild about amusement parks. Each day, we flock by the millions to the nearest park, paying a sizable hunk of money to wait in long lines for a short 60-second ride on our favorite roller coaster. The thought prompts one to consider what is it about a roller coaster ride that provides such widespread excitement among so many of us and such dreadful fear in the rest? Is our excitement about coasters due to their high speeds? Absolutely not! In fact, it would be foolish to spend so much time and money to ride a selection of roller coasters if it were for reasons of speed. It is more than likely that most of us sustain higher speeds on our ride along the interstate highway on the way to the amusement park than we do once we enter the park. The thrill of roller coasters is not due to their speed, but rather due to their accelerations and to the feelings of weightlessness and weightiness that they produce. Roller coasters thrill us because of their ability to accelerate us downward one moment and upwards the next; leftwards one moment and rightwards the next. Roller coasters are about acceleration; that's what makes them thrilling. And in this part of Lesson 2, we will focus on the centripetal acceleration experienced by riders within the circular-shaped sections of a roller coaster track. These sections include the clothoid loops (that we will approximate as a circle), the sharp 180-degree banked turns, and the small dips and hills found along otherwise straight sections of the track.
If a tsunami is travelling at 970 km/h with a wavelength of 450 km, what is the frequency of the wave
Answer:
Frequency of wave = 2.16 Hz (Approx)
Explanation:
Given:
Speed of tsunami = 970 km/h
Wavelength = 450 km
Find:
Frequency of wave
Computation:
Frequency = Speed / Wavelength
Frequency of wave = Speed of tsunami / Wavelength
Frequency of wave = 970 / 450
Frequency of wave = 2.16 Hz (Approx)
Please help!! I'll name you brainliest!!
Answer:
Has the same properties as it's parts
Explanation:
hey, what is rectilinear propagation of light ?
Relative speed depends on the individual speeds and
A. direction
C. friction
E. all of the above
B. mass
D. resistance
A force that one object can apply to another object without touching it is _____?
Answer:
Gravity
Gravity as well as electrostatic and magnetic attraction and repulsion provide real life examples of forces being exerted by one object on another without them being in contact with each other. Many children are aware of magnetism and have played with fridge magnets.
Explanation:
A force that one object can apply to another object without touching it is Gravity.
What is gravity?Gravity is the force of attraction between the two objects separated by a particular distance. Gravity force is exerted on every object present in the universe.
Gravity as well as electrostatic and magnetic attraction and repulsion provide real-life examples of forces being exerted by one object on another without them being in contact with each other. Many children are aware of magnetism and have played with fridge magnets.
Therefore force that one object can apply to another object without touching it is Gravity.
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El carrusel de la feria del pueblo tiene una velocidad de 2 rpm. En un determinado instante se corta la corriente y como consecuencia del rozamiento, aparece una aceleración de frenado de 0,05 rad/s2.
Answer:
t = 4.19 s, θ = 0.437 rad
Explanation:
This is an exercise in rotational kinematics in this case we indicate the angular velocity and the angular acceleration, asking for the time and the angle it takes to stop.
w = w₀ + α t
w² = w₀² + 2 α θ
when the system stops the angular velocity is zero
0 = w₀- α t
0 = w₀² - 2 α θ
t = w₀ / α
tea = w₀² / 2 α
let's reduce the magnitudes to the SI system
w₀ = 2 rpm (2π rad / 1 rev) (1 min / 60s) = 0.209 rad / s
let's calculate
t = 0.209 / 0.05
t = 4.19 s
θ = 0.209 2/2 0.05
θ = 0.437 rad
An object is placed 2.5 cm away from a converging lens with a focal length of 1.5 cm
Answer:
The correct answer is "-1.5 cm".
Explanation:
The given values are:
Object is placed,
u = 2.5 cm
Focal length,
f = 1.5 cm
On applying the lens formula, we get
⇒ [tex]\frac{1}{u} +\frac{1}{v} =\frac{1}{f}[/tex]
or,
⇒ [tex]\frac{1}{v} =\frac{1}{u} -\frac{1}{f}[/tex]
On substituting the given values, we get
⇒ [tex]=\frac{1}{2.5} -\frac{1}{1.5}[/tex]
⇒ [tex]=\frac{1.5-2.5}{3.75}[/tex]
⇒ [tex]=\frac{-1}{3.75}[/tex]
⇒ [tex]v=-3.75 \ cm[/tex]
As we know,
Magnification, [tex]m=\frac{v}{u}[/tex]
On substituting the values, we get
⇒ [tex]=\frac{-3.75}{2.5}[/tex]
⇒ [tex]=-1.5 \ cm[/tex]
Of the many functions of the skeletal system, which is directly helpful to the circulatory system?
stores calcium and phosphorus
stores calcium and phosphorus
provides an attacment point for muscles
provides an attacment point for muscles
produces blood cells
produces blood cells
provides shape and support for the body
provides shape and support for the body
protects internal organs
protects internal organs
Answer:
It provides shape and support for the body
Explanation:
Providing shape and support for the body is one of the many functions of the skeletal system, which is directly helpful to the circulatory system. Thus, the correct option is D.
What are the functions of Skeletal system?The skeletal system is the body's central framework. This system consists of bones and connective tissue, including the cartilage, tendons, and ligaments. The system is also called the musculoskeletal system. It is made up of 206 bones.
The human skeleton serves six main functions which are providing support, movement of the body, protection, production of blood cells such as red blood cells and white blood cells, storage of ions such as calcium and phosphorus, and the endocrine regulation. Bone is a hard, dense connective tissue which is responsible for forming most of the adult skeleton, the support structure of the body of an organism.
Providing shape and support for the body is the function which is directly helpful to the circulatory system of the body.
Therefore, the correct option is D.
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what is the difference between a girl chromosome and a boy chromosomes?
Explanation:
Girls have two X Chromosomes while boys have one X Chromosome and, as you now know, one Y Chromosome. So girls are XX and boys are XY.
Answer: The X and Y chromosomes, also known as the sex chromosomes, determine the biological sex of an individual: females inherit an X chromosome from the father for a XX genotype, while males inherit a Y chromosome from the father for a XY genotype (mothers only pass on X chromosomes).
Explanation:
Other than the resultant force acting on an object what else do you need to know to calculate the acceleration??
In addition to the resultant force acting on an object, the mass of the object should be known to find the acceleration. So, the mass is the answer.
Newton's second law of motion states that
a = F / m
Where:
a is the acceleration of the object,
The net force acting on the object is F
m is the mass of the object.
By dividing the net force (F) by the mass (m), you can determine the acceleration (a) of the object.
So, both the net force and the mass are necessary to calculate the acceleration. So, the mass is the answer.
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A bowling ball is thrown at a distance of 0.5 m toward the pins. If it takes the
bowling ball 2.3 seconds to reach the pins, what is the speed of the bowling
ball?
Answer:
Speed = 0.217 m/s
Explanation:
Given the following data;
Distance = 0.5m
Time = 2.3 seconds
To find the speed;
Speed = distance/time
Speed = 0.5/2.3
Speed = 0.217 m/s
Therefore, the speed of the bowling
ball is 0.217 meter per seconds.
ANSWER QUICK! In an experiment, a scientist places human red blood cells in seawater. What changes do you think would be made to the red blood cells due to osmosis? Cite facts about osmosis to support your prediction.
12. An unbalanced 6.0 newton force acts eastward on an object for 3.0 seconds. The impulse
produced by the force is
Answer:
Impulse=18Ns
Explanation:
Impulse= force*time
Plug in known values...
I=6N*3s
I=18Ns
The impulse produced by the force is 18Ns
What is Impulse?
Impulse is the integral of a force, F, over the time interval, t, for which it acts. Since force is a vector quantity, impulse is also a vector quantity. Impulse= force*time Impulse is the change of momentum of an object when the object is acted upon by a force for an interval of time.Given:
F= 6.0N
t= 3.0 s
On substituting these values in the above formula:
[tex]I=6N*3s\\ \\I=18Ns[/tex]
Thus, The impulse produced by the force is 18 Ns.
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As an astronaut travel far away from earth her weight
Explanation:
As an astronaut travel far away from the earth her weight Decreases because weight depends upon the acceleration due to gravity and in space there is no gravity.
The diagram above shows the process of natural selection. What is X?
Competition
Evolution
Mimicry
Reproduction
Answer:
Reproduction
Explanation:
because reproduction produces variation within the species allowing the species to survive selection
Answer: D = reproduction
Explanation:
how do crumple zones extend the deceleration of a car?
how do crumple zones help redistribute the force of an impact?
Answer:
Uv rays
Explanation:
ultraviolet rays of the suun gives force
Answer:
what zones
Explanation:
If a book was to fall from the shelf, how fast would it be moving just before hitting the floor?
Answer:
0 becouse it will still before falling
Explanation:
what best decribes the science method
Complete the statements about convection currents. Convection currents occur in fluids because of temperature and differences. Convection currents transfer energy throughout a fluid. They continue until all of the fluid is at the same temperature.
Answer:
density; thermal
Explanation:
Convection currents occur in fluids because of temperature and density differences. Convection currents transfer thermal energy throughout a fluid.
When a fluid is heated, the molecules closest to the heat source gets heated first and their temperature is raised. The rise in temperature lowers their density and as such, they move to the upper portion of the fluid to be replaced by yet-to-be-heated molecules at the upper portion.
When the replacement molecules also get heated, the same process occurs and a to-and-from rotational movement of molecules, also known as convection current, is created within the fluid. The to and from movement, thus, transfer thermal energy within the fluid until all the molecules within the fluid are at the same temperature.
Answer
density; thermal
Explanation:
its right i just did it
5 points
A car, of mass 1600 kg, is travelling at a speed of 20 m/s when the driver
applies the brakes. The car decelerates at a constant rate and stops. The
braking force used to stop the car and driver was 8000 N. Calculate the
braking distance of the car in m. This is a two step problem, you must
calculate a value and use it to find the final answer.
Answer:
The braking distance of the car is 40 m
Explanation:
The two steps are;
1) Calculation (finding) of the initial kinetic energy , K.E., of the car
2) Calculation (finding) of the braking distance from the calculated K.E., of the car
The initial Kinetic energy of the car, K.E. = 1/2×m×v²
Where;
m = The mass of the car = 1,600 kg
v = The velocity of the car = 20 m/s
∴ K.E. = 1/2 × 1,600 kg × (20 m/s)² = 320,000 joules
2) The work done in stopping the car, W = The braking force, 'F' × The braking distance, 'd'
∴ W = F × d
Where;
F = The braking force = 8,000 N
d = The braking distance of the car
By energy conservation principle, the work, 'W', that is required to stop the car = The initial kinetic energy of the car, K.E.
∴ W = K.E. = 320,000 joules
Therefore, by substituting the known values for the variables, we have;
320,000 J = 8,000 N × d
∴ d = 320,000 J/(8,000 N) = 40 m
The braking distance of the car, 'd' = 40 m.
what hapenes to the wavelength of a wave if the frequency of the wave is increased?
Answer: The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
Explanation:
A horizontal net force F is exerted on an object at rest. The object starts at x=0 m and has a speed of 4.0 m/s after moving 4.0 m along a horizontal frictionless surface. The net force F as a function of the object's position x is shown below
Explanation:
The solution is be found in the attachment.
A horizontal net force F is exerted on an object at rest. The object starts at x = 0 m and has a speed of 4.0 m/s after moving 8.0 m along a horizontal frictionless surface. The net force F as a function of the object's position x is shown below.
What is the mass of the object?
Answer: 30 kg
What statement below is true about Mercury?
A)
On Mercury you weigh only 70% of what you weigh on Earth
B)
On Mercury you weigh only 38% of what you weigh on Earth
On Mercury you weigh only 90% of what you weigh on Earth
D)
On Mercury you weigh only 10% of what you weigh on Earth
Answer: It is B 38% have a good day :DDD
If you run up a set of steps quickly compared to walking up the same set of steps slowly. Which requires
more WORK
a.) running b.) walking c.) same
Answer:
a. running
Explanation:
because you are using more energy
Answer:
In mechanical terms, person A who walks slowly for most of the way then runs the last few steps does more work than person B who runs most of the way then walks slowly the last few steps. Person B uses more energy than person A, but this is a separate issue about the difference between external and internal work.
Explanation:
sourced from comminity fitbit
A hydrogen atom has a radius of 2.5 x 10-11 m
Determine the radius of a magnesium atom.
Answer:
[tex]R = 1.5* 10^{-10}m[/tex]
Explanation:
Given
[tex]r = 2.5 * 10^{-11}m[/tex] -- radius of hydrogen atom
See attachment
Required
Determine the radius of magnesium atom (R)
From the attachment, the ratio of a hydrogen atom to a magnesium atom is:
[tex]Ratio = 6mm : 36mm[/tex]
Simplify
[tex]Ratio =1 : 6[/tex]
Represent the radius as ratio:
[tex]Ratio = r : R[/tex]
Substitute [tex]r = 2.5 * 10^{-11}m[/tex]
[tex]Ratio = 2.5 * 10^{-11}m : R[/tex]
Equate both ratios
[tex]2.5 * 10^{-11}m : R = 1 : 6[/tex]
Express as fraction
[tex]\frac{2.5 * 10^{-11}m}{R} = \frac{1}{6}[/tex]
Cross Multiply
[tex]R * 1 = 2.5 * 10^{-11}m * 6[/tex]
[tex]R * 1 = 2.5 * 6* 10^{-11}m[/tex]
[tex]R * 1 = 15* 10^{-11}m[/tex]
[tex]R = 15* 10^{-11}m[/tex]
[tex]R = 1.5*10* 10^{-11}m[/tex]
[tex]R = 1.5* 10^{1-11}m[/tex]
[tex]R = 1.5* 10^{-10}m[/tex]
Hence, the radius of the magnesium atom is: [tex]1.5* 10^{-10}m[/tex]
Plzzzz help me!! Plz don’t guess, than you!!
Answer:
The answer is W
The graph is the path Beth took on a walk.
A graph with horizontal axis time (seconds) and vertical axis position in (meters). The line runs in 2 straight segments from 0 seconds 2 meters to 6 seconds 8 meters to 10 seconds 0 meters.
What does the line from time 6 to 10 indicate?
Beth slowed down considerably.
Beth went back toward her origin.
Beth sped up considerably.
Beth went farther away from origin
Answer:
Beth went back toward her origin
Explanation:
Answer:
B
Explanation:
Hope this helps :)