Answer:
athlete W = 2560 J
roce W_{fr} = - 2560 J
Explanation:
For this exercise we can use the relationship between work and kinetic energy
W = ΔK
W = K_f -K₀
as the bearing of rest its v₀ = 0 and the final velocity is v = 8 m / s
athlete's job is
W = ½ m [tex]v_{f}^2[/tex] - 0
let's calculate
W = ½ 80 8²
W = 2560 J
For the work of the friction force let us use that since the athlete goes at constant speed, they relate it to zero, therefore the forces are in equilibrium
∑F = 0
F- fr = 0
F = fr
Therefore, the magnitude of the friction force is equal to the force applied by the athlete, as the friction force always has the opposite direction to the movement, its work is
W_{fr} = - W_{atlete}
W_{fr} = - 2560 J
A train A travelled a distance of 150 km in 3 hours, whereas, train 'B"
travelled a distance of 180 km in 4 hours. Which train travelled faster?
Answer:
Therefore, Train A is faster with 50km/h and a 5km/h difference
Explanation:
train A
150km/3h = 50km/h
train B
180km/4h = 45km/h
Question 2 of 5
What is an example of anaerobic exercise?
A. Walking
B. Lifting weights
C. Swimming
D. Dancing
SMIT
Q7) A box sliding with a velocity of 5 m/s accelerates at 2 m/s^2. How
much is the box displacement after 6 s?
Answer:
The box displacement after 6 seconds is 66 meters.
Explanation:
Let suppose that velocity given in statement represents the initial velocity of the box and, likewise, the box accelerates at constant rate. Then, the displacement of the object ([tex]\Delta s[/tex]), in meters, can be determined by the following expression:
[tex]\Delta s = v_{o}\cdot t+\frac{1}{2}\cdot a\cdot t^{2}[/tex] (1)
Where:
[tex]v_{o}[/tex] - Initial velocity, in meters per second.
[tex]t[/tex] - Time, in seconds.
[tex]a[/tex] - Acceleration, in meters per square second.
If we know that [tex]v_{o} = 5\,\frac{m}{s}[/tex], [tex]t = 6\,s[/tex] and [tex]a = 2\,\frac{m}{s^{2}}[/tex], then the box displacement after 6 seconds is:
[tex]\Delta s = 66\,m[/tex]
The box displacement after 6 seconds is 66 meters.
How do you calculate a bearing angle and its equivalent angle?
Explanation:
A bearing if an angle is measured clockwise from north direction.
e.g Below the bearing of B from A is 025. (3 figures are always given). the bearing of A from B is 205°.
Imagine driving down the road and you suddenly doubled your velocity. What then happens to your overall kinetic energy?
it is halved
it remains unaffected
it is doubled
it is quadrupled
water flows in a pipe of a terminal of A1=0.02 m2 with a speed of V1=2 m/s. At the second end of the pipe A2=0.04 m2, the speed of flow is V2=_______m/s
1) A mass of 20kg was lifted from a height of 5m to 12m. How much work was done?
Answer:
1400joules
Explanation:
work(j)= force × distance.
Distance is from 5m to 12 that is 7m
Force, we weren't given, and the formula is mass × acceleration due to gravity. mass is 20kg and a is 10 or 9.8
f= 20×10
f=200
work= 200 × 7
work= 1400joules
Hope it helped(...and is correct )
Which is a characteristic of the part of the atom marked "A"?Which is a characteristic of the part of the atom marked "A"?Which is a characteristic of the part of the atom marked "A"?Which is a characteristic of the part of the atom marked "A"?Which is a characteristic of the part of the atom marked "A"?
Answer:
its c
Explanation:
just did it
Answer:
c
Explanation:
Also, I need the answer in like 5 mins. This is kinda hard for me can someone help me. It's about the solar system.
Answer:
North star, its close to our solar system but not in it. hope this helps
Answer all of these questions and you will get the brainlist
Answer:
2 ans : the bell has 8550 J energy
Answer:
1. kinetic energy = ½mv²
m= 2.1 kg
v = 30m/s
Ek = ½ ×2.1×30×30
= 945J
2. potential energy = mgh
m = 190kg
g = 9.8
h = 45m
Ep = 190×9.8 × 45
= 83790J
3.potential energy = mgh
m= 75kg
g= 9.8
h = 300m
Ep = 75×9.8×300
= 220,500J
what are the 5 forces in science?
Applied Force.
Gravitational Force.
Normal Force.
Frictional Force.
Air Resistance Force.
Answer:
Gravity, Electromagnetism, Weak Interaction, Strong Interaction, Unifying the Fundamental Forces.
Explanation:
...he...
2- A diver on Saturn's moon Titan is 50 m below the surface of a lake of liquid
methane.
(a) what is the increase in pressure on him due to his depth in the methane? The
density of liquid is 420 kg/m3. the gravitational field on Titan is 1.4 N/kg.
[2]
(6) we are told that the pressure of the atmosphere on Titan is 1600 mbar. What is
the total pressure on the diver (in kPa)
[2]
research has shown ____ often depends on one's current status, circumstances, and expectations.
Research has shown
A subjective well-being
B relative deprivation
C. parasympathetic division
D. evaluative aspect
Answer:
A. subjective well-being
Explanation:
A subjective well being does indeed often on the status, expectations and circumstances according to the theory of emotion. Also, there are flashcards on quizlet about this subject so if you want to learn more go there!
Answer: A
Explanation:
How is blue colour made?
Answer:
In terms of the light spectrum, blue is a primary color, which means that it is one of the base colors that exist in the universe and it cannot be created by combining different colors together. The primary pigment colors are cyan, magenta, and yellow. Cyan absorbs red, yellow absorbs blue, and magenta absorbs green.
Explanation:
Hope this helped Mark BRAINLEST!!!
What part of the atom takes up most of the atoms space?
The atom
The electron cloud
The nucleus
The bottom part
Answer:
The electrons
Explanation:
what affects the strength of an electric field? FOR SCIENCE
Answer:
The electric field strength is dependent upon the quantity of charge on the source charge (Q) and the distance of separation (d) from the source charge.
What is the SI unit of measurement for speed? A.meters per second (m/s) B.meters per second (m/s) C.Miles per hour (mi/hr) D.Miles per hour (mi/hr) Kilometers per minute (km/min) Kilometers per minute (km/min) Grams per unit (g/u) Grams per unit (g/u)
Explanation:
The SI unit of measurement for speed is metres per second (m/s) .
Speed : The distance travelled by a body per unit time is know as speed.
Hope it will help.
please help meeee, I need help to complete my assignment
Does an object of a higher mass absorb more thermal energy than an object of lower mass?
he concept of energy can be calculated in multiple ways. Which units are used for energy? Check all that apply.
joules
kilogram meters2/seconds2
newtons
kilojoules
meters/seconds2
Answer:
Joules, Kilogram Meters²/Seconds², and Kilojoules
Explanation:
electromagnetic wav
Answer:
e search mo sa utak mo kasi di mo alam
PLZZZ HELP ME ASAP FOR BRAINLIEST AND 20 POINTS
I am desperate and these are my last points.
:'(
Answer:
gamma rays
Explanation:
How is atomic energy is produced ?
Answer:
Fission and Fusion
Explanation:
There are two basic processes: fission and fusion. In both processes, mass is converted to energy according to the famous equation, e=mc2
In fission, heavy fuel (isotopes of uranium, plutonium, thorium, etc.) atoms split, releasing kinetic energy daughter particles and as radiation. In a reactor plant kinetic energy of the daughter particles is converted to thermal energy as the particles are slowed by the fuel matrix or primary coolant. Radiation is absorbed by various components of the reactor and converted to thermal energy. Thermal energy from both sources is then carried out of the reactor core by primary coolant to a turbine where it is converted to electrical energy which is then transmitted to the power grid.
In fusion, light atoms of hydrogen combine to form helium. Energy released from this reaction will be captured and used to generate electricity as well, once we have constructed a fusion reactor large enough to be self-sustaining (i.e. produce as much or more energy from fusion than needed to start the reaction going).
In the case of nuclear weapons, the tremendous energy from the nearly simultaneous fission/fusion reactions is used to create a fireball, intense radiation, and a large shock wave.
TRUE OR FALSE, PLEASEE HELPPP ASAP
6) The amount of work done on an object depends on the final speed of the object
7) 1 Horsepower (hp) is equal to 746 Watts.
8) The SI unit for Work is the Joule.
9) The lower the percentage, the better the efficiency
10) The Work-Energy theorem states that the change in kinetic energy also equals the amount of work done on an object or system.
Answer: You do not deserve help, You dont help other people you only use them for points so...do not ask for help from us now
Explanation:
please help me im struggling
Answer:
right
Explanation:
Un automóvil viaja a la velocidad de 10 m/s. Se acelera Durante 12s y aumenta su velocidad hasta 70 m/s ¿Que aceleración experimenta el automóvil?
Answer:
Aceleracion = 5 m/s²
Explanation:
Dados los siguientes datos;
Velocidad inicial = 10 m/s
Velocidad final = 70 m/s
Tiempo, t = 12 segundos
Para encontrar la aceleración;
Aceleración se puede definir como la tasa de cambio de la velocidad de un objeto con respecto al tiempo.
Esto simplemente significa que la aceleración viene dada por la resta de la velocidad inicial de la velocidad final a lo largo del tiempo.
Por lo tanto, si restamos la velocidad inicial de la velocidad final y la dividimos por el tiempo, podemos calcular la aceleración de un objeto. Matemáticamente, la aceleración viene dada por la fórmula;
[tex] Aceleracion = \frac{final \; velocidad - inicial \; velocidad}{tiempo}[/tex]
Sustituyendo en la fórmula, tenemos;
[tex] Aceleracion = \frac{70 - 10}{12}[/tex]
[tex] Aceleracion = \frac{60}{12}[/tex]
Aceleracion = 5 m/s²
A golf club with mass 0.5 kg is swung at 23 m/s toward a stationary golf ball on a tee. The club barely slows down to 17 m/s, but the ball flies off the tee at 69 m/s. Calculate the mass of the golf ball in kg. Answer to 4 decimals. Help fast please. Will mark brainliest
Answer:
I gotchu fam. 0.0435 kg
Explanation:
m1v1+m2v2=m1v1f+m2v2f
(0.5)(23)+(m2)(0)=(0.5)(17)+(m2)(69)
11.5=8.5+69m2
3=69m2
0.0435 kg
state kepler's three laws of planetary motion
Answer:
1) every planet’s orbit is an ellipse with the Sun at a focus.
2) a line joining the Sun and a planet sweeps out equal areas in equal times.
3) the square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit.
Lamar writes several equations trying to better understand potential energy. What conclusion is best supported by lamar's worm?
Complete question is;
Lamar writes several equations trying to better understand potential energy. What conclusion is best supported by Lamar’s work?
A) The elastic potential energy is the same for any distance from a reference point.
B) The gravitational potential energy equals the work needed to lift the object.
C) The gravitational potential energy is the same for any distance from a reference point.
D) The elastic potential energy equals the work needed to stretch the object
Answer:
B) The gravitational potential energy equals the work needed to lift the object.
Explanation:
In physics, we know that potential energy is the energy of a body at rest while the energy of a body in motion is known as kinetic energy.
However,the work required to lift a body from it's position of rest is equal to the Gravitational potential energy of that body.
Elastic potential energy is the one that is stored as a result of force applied to deform an elastic object. Thus, it is not equal to the work needed to stretch the object and it is also not the same for any distance from reference point.
Thus, looking at the options, Option B is correct
How does a pendulum model an energy conversion system?
NO LINKS!
Answer:As a pendulum swings, its potential energy converts to kinetic and back to potential. ... A swinging pendulum.
Explanation:During the course of a swing from left to right, potential energy is converted into kinetic energy and back.
What geologic process creates an alcove?
Group of answer choices
A. wind erosion
B.glaciation
C.tectonic uplift
D.coastal erosion