Answer:
[tex]6.42\ \text{m/s}[/tex]
Explanation:
v = Final velocity
u = Initial velocity = 0
s = Displacement of Tarzan's feet = 2.1 m
a = g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]
From the kinematic equations we get
[tex]v^2-u^2=2as\\\Rightarrow v=\sqrt{2as+u^2}\\\Rightarrow v=\sqrt{2\times 9.81\times 2.1+0}\\\Rightarrow v=6.42\ \text{m/s}[/tex]
At the instant just before Tarzan's feet touch the ground the velocity of his feet are [tex]6.42\ \text{m/s}[/tex].
The speed at an instant just before Tarzen's feet touch the ground will be
[tex]V=6.42\ \dfrac{m}{s}[/tex]
What is speed?The speed of any body is defined as the movement of the body with respect to the time.
It is given in the question that
Mass of the Tarzen m=100 kg
The distance of the Tarzen's feet from the ground s=2.1 m
The acceleration due to gravity [tex]a=9.81\ \frac{m}{s^2}[/tex]
The speed of the Tarzen will be calculated by applying the equation of motion.
[tex]v^2=u^2+2as[/tex]
Since initial velocity is zero u=0
[tex]v^2=2as[/tex]
[tex]v=\sqrt{2as}[/tex]
[tex]v=\sqrt{2\times 9.81\times 2.1} =6.42 \ \frac{m}{s}[/tex]
Thus the speed at an instant just before Tarzen's feet touch the ground will be
[tex]V=6.42\ \dfrac{m}{s}[/tex]
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Some people say that you can contract HIV by sharing a drink with someone who has HIV. True or false? Why?
Answer: This is definitely false... you have to.. have séx with someone who has H.I.V to actually get H.I.V
Excluding the noble gas group, how does the number of valence electrons in an element influence its chemical stability?
A. Elements with intermediate numbers of valence electrons are the last chemically stable.
B. Elements with the highest number of valence electrons are the most chemically stable.
C. Elements with intermediate number of valence electrons are the most chemically stable.
D. Elements wit the lowest number of valence electrons are the most chemically stable.
Answer:
C. Elements with intermediate number of valence electrons are the most chemically stable.
A macro element that is a component of ATP
Phosphorus is a macro element that is a component of ATP.
A Canadian college student who has taken an astronomy class goes home for the holidays and persuades his parents to let him borrow the family car. When he returns, he finds that his parents are very angry with him, claiming he left the garage door open. Yet he remembers that he carefully closed the garage door with the electronic remote control in the car. After consulting with his astronomy instructor, he comes up with an alternative explanation for why the garage door is open. Which of the following is PART of that explanation?
a. The Sun was so bright and high in the sky in December in Canada that it got into his
parents' eyes
b. There was an eclipse of the Sun
c. It was a time of solar maximum, and there had been a big flare on the Sun earlier
d. No aurorae had been seen in the sky for many months
e. The number of sunspots had reached an all-time minimum
c. It was a time of solar maximum, and there had
Answer:
Option C, It was a time of solar maximum, and there had been a big flare on the Sun earlier
Explanation:
It was solar maximum due to which the amount of magnetic flux on the sun's surface rises up
This causes high frequency radio blackouts and interrupt with the communication on earth
Some times they also cause ripple effect in the electronic items as in the remote control used by the college student. They can disrupt the electronic communications.
Hence, option C is correct
can someone help me :)
Answer:
mass= 60kg
velocity= 10m/s
momentum = mass × velocity
p=m×v
p= 60×10
p= 600kgm/s
A satellite orbits earth at constant speed in circular orbit.Which statement is correct? A The resultant force on the satellite is zero. B The resultant force on the satellite is towards the Earth. C The resultant force on the satellite is away from the Earth. D The resultant force on the satellite is in the direction of motion.
Answer:
B The resultant force on the satellite is towards the Earth.
Explanation:
In the case when the satellite orbits earth would be at constant speed in the circular orbit so hee the resultant force that on the satellite would be with regard to the earth
So as per the given situation, the option B is correct
And, the rest of the options would be wrong
And, the same would be relevant
which is the best description of a soil sample with a pH of 4.5?
a. acidic
b. basic
c. inconclusive
d. neutral
Answer:
A. Acidic
Explanation:
I hope this helped!
Part A
Which sentence best states the central idea of paragraphs 21-22 in "Energy Story"?
A. Materials that are insulators and conductors have a high
resistance to electricity.
B. It is more difficult for electricity to pass through insulators than conductors.
C. Insulators and conductors are able to generate a high amount of electricity
D.Electrons move through rubber easier than they move through
metal.
Part B
Which sentence from "Energy Story" best supports the answer in Part A?
A. "Electricity is conducted through some things better than
others."
B. "Its resistance measures how well something conducts
electricity."
C."Some things hold their electrons very tightly."
D. "Other materials have some loosely held electrons, which move
through them very easily."
Answer:
Which sentence best states the central idea of paragraphs 21-22 in "Energy Story"?
A. Materials that are insulators and conductors have a high
resistance to electricity.
Part B
Which sentence from "Energy Story" best supports the answer in Part A?
B. "Its resistance measures how well something conducts
electricity."
Explanation:
Which statements about braking a car are true?
The greater the kinetic energy of a car, the longer it takes for the car to stop.
The lower the kinetic energy of a car, the longer it takes for the car to stop.
If the speed of a car doubles, the car’s kinetic energy and braking distance quadruple.
If the speed of a car doubles, the car’s kinetic energy and braking distance remain the same.
Answer:
the first statement...
Answer:
The first answer is correct.
Plz mark brainliest.
Hope I helped.
Explanation:
your dog has been scratching itself for the past few days. You notice that this scratching is occurring more than usual. When you take him to the veterinarian, the doctor explains that your dog has been infested with fleas. The fleas have been making your dog scratch like crazy, while making a nice little home for themselves within your dog's fur.
In this scenario, what type of relationship does the dog and the fleas have?
a. mutualism
b. commensalism
c. parasitism
Answer:
Parasitism
Sorry if I'm wrong
Answer: C
Explanation:
Parasites can cause symptoms ranging from mild discomfort and intermittent loose stool, to severe issues such as anemia, skin disease, secondary infections, difficulty breathing, and malnutrition which is why it's so important to prevent infestations, and, if they do occur, to treat your pet quickly
The dog is itichingbecause a parasite.
A fruit basket of mass 44.5 kg weighs approximately how much in newton? (Answer should have a number and a proper unit) *
Answer:
445N
Explanation:
F=mg
m=44.5kg
g=10m/s2
F=44.5 * 10
=445N
A lawn mower is pushed with a force of 79 N. If 11,099 J of work are done on mowing the lawn, what is the total distance the lawn mower was pushed? Round your answer to a whole number (no decimal places).
Answer:
141m
Explanation:
a 200 kg rock lies on the surface of a planet. the acceleration due to gravity on the surface of the planet is 6,0. calculate the mass of the planet if it's radius is 700km
Answer:
4.41 × 10²² kg
Explanation:
Let the mass of planet be M, rock be m
Therefore,
[tex]net \: force \: on \: rock \: = weight \\ (200)(6) = \frac{(6.67 \times 10 {}^{ - 11})(200)(m) }{(700000) {}^{2} } \\ m = 4.41 \times 10 {}^{22} \: kg[/tex]
An object of mass 1.5 kg is moving forwards along the floor against an applied force of
40.0 N [backwards]. If the coefficient of kinetic friction is 0.25, determine the
acceleration of the object.
Answer:
The acceleration of the object is -29.12 m/s².
Explanation:
The acceleration of the object can be calculated by Newton's second law:
[tex] \Sigma F = ma [/tex]
[tex] - F - F_{\mu} = ma [/tex]
[tex] - F - \mu mg = ma [/tex]
Where:
F: is the applied force = 40.0 N
μ: is the coefficient of kinetic friction = 0.25
m: is the mass of the object = 1.5 kg
g: is the acceleration due to gravity = 9.81 m/s²
a: is the acceleration =?
[tex] a = \frac{- F - \mu mg}{m} = \frac{-40.0 N - 0.25*1.5 kg*9.81 m/s^{2}}{1.5 kg} = -29.12 m/s^{2} [/tex]
The minus sign is because means that the object is decelerating due to the applied force and the friction.
Therefore, the acceleration of the object is -29.12 m/s².
I hope it helps you!
A race car has a mass of 710kg. It starts from rest and speeds up to 12m/s in 12.0s. The car is uniformly accelerated during the entire time. What net force is applied to it?
En un recipiente de cobre de forma rectangular de aproximadamente 3.5 m largo por 4.5m ancho tiene una temperatura en temporada de invierno 4 ° C . Calcular su superficie cuando este en verano a una temperatura 40 ° C . ( Cobre 16.6 x 10 ( -6 )
Answer:
A_f= 15,769 m²
Explanation:
Este es un ejercicio de dilatación térmica,
ΔA = (2α) A₀ ΔT
el arrea de recipiente
A₀ = L A
A₀ = 3,5 4,5
A₀= 15,75 m²
el coeficiente de dilatación térmica es alfa = 16,6 10⁻⁶ C⁻¹
calculemos
ΔA = 2 16,6 10⁻⁶ 15,75 ( 40 -4)
ΔA = 522,9 (36) 10⁻⁶
A= 1,88 10⁻² m2
el cambio de volumen es
ΔA = A_f – A₀
A_f = A₀ + ΔA
A_f= 15,75 +1,88 10⁻²
A_f= 15,769 m²
A car moves 8 km from home to school and then back to the home. a) Calculate the Distance covered by this car. b) What is the Displacement for the whole trip?
Explanation:
Distance covered = Total distance travelled by the car
Since the car travels to school and back to home again,
Total diatance covered = 8 + 8 = 16km
Displacement = Shortest distance between start point and destination.
Since, the car returns back to home from school,
the start and destination point are same.
So Displacement = 0
.
[tex]25 {?}^{?} \times \frac{?}{?} [/tex]
Answer:
what is your exact question.
A wire of radius 5 x 10⁻⁴ m is needed to prepare a coil of resistance 40 Ω. The resistivity of the material of the wire is 3.14x10⁻⁷ Ωm. Calculate the length of the wire.
Answer:
100 m
Explanation:
From the question,
R = Lρ/A.................... Equation 1
Where R = resistance of the wire, L = length of the wire, ρ = resistivity of the wire, A = cross sectional area of the wire.
But,
A = πr².................... Equation 2
Where r = radius of the wire.
Substitute equation 2 into equation 1
R = Lρ/πr²
Make L the subject of the equation
L = Rπr²/ρ...................... Equation 3
Given: R = 40 Ω, r = 5×10⁻⁴ m, ρ = 3.14×10⁻⁷ Ωm
Constant: π = 3.14
Substitute these values into equation 3
L = [40×3.14×( 5×10⁻⁴)²]/ (3.14×10⁻⁷)
L = 40×3.14×25×10⁻⁸/(3.14×10⁻⁷)
L = 100 m
Hence the length of the wire is 100 m
A light wave has a frequency of 5 x 108. What is the wavelength of the light wave? (Assume the speed of light to be 3 x 108.)
Answer:
Wavelength of light wave = 0.6 m
Explanation:
Given:
Frequency of wave = 5 x 10⁸
Speed of light = 3 x 10⁸ m/s
Find:
Wavelength of light wave
Computation:
The size of a wave form is its spatial duration, or the duration in which the wave's form repeats.
Wavelength of light wave = Speed of light / Frequency of wave
Wavelength of light wave = [3 x 10⁸] / [5 x 10⁸]
Wavelength of light wave = 0.6 m
A sound wave is propagating through the air from left to right as shown in the diagram below.
Answer:
Explanation: Pules
Answer: longitudinal (compression)
Explanation:
Which statement describes the weight of the horse?
Weight is the total amount of matter in the horse's body.
Weight is the resistance to a change in the horse's motion.
Weight is the gravitational force of attraction between Earth and the horse.
Weight is a property of the horse that remains the same from planet to planet.
Weight is the gravitational force of attraction between the Earth and the horse. The correct option is C.
What is gravitational force?Weight is a measure of the force with which the Earth's gravity attracts the mass of an object. The weight of an object depends on its mass of the object and the strength of the gravitational field it is in. On Earth, the weight of an object is directly proportional to its mass and acceleration due to gravity.
Therefore, the weight of the horse is the force with which the Earth attracts the mass of the horse, and it is proportional to the mass of the horse and the strength of the gravitational field at the horse's location. The other options do not accurately describe weight.
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1. On planet Jupiter, the acceleration due to
gravity is about 26 m/s2. How high would a boy
be able to throw a ball on Jupiter if he can
throw it vertically 10m high on Earth?
Answer:
The boy can throw the ball to a height of 3.85 m on Jupiter
Explanation:
We'll begin by calculating the initial velocity at which the ball is thrown on EARTH. This can be obtained as follow:
On Earth:
Acceleration due to gravity (g) = 10 m/s²
Maximum height (h) = 10 m
Final velocity (v) = 0 m/s (at maximum height)
Initial velocity (u) =?
v² = u² – 2gh (since the ball is going against gravity)
0² = u² – 2 × 10 × 10
0 = u² – 200
Collect like terms
0 + 200 = u²
200 = u²
Take the square root of both side
u = √200 m/s
Finally, we shall determine the maximum height of the ball at JUPITER. This can be obtained as followb
On Jupiter:
Acceleration due to gravity (g) = 26 m/s²
Initial velocity (u) = √200 m/s
Final velocity (v) = 0 m/s (at maximum height)
Maximum height (h) =..?
v² = u² – 2gh (since the ball is going against gravity)
0² = (√200)² – 2 × 26 × h
0 = 200 – 52h
Collect like terms
0 – 200 = –52h
–200 = –52h
Divide both side by –52
h = –200 / –52
h = 3.85 m
Thus, the boy can throw the ball to a height of 3.85 m on Jupiter.
A couch is pushed with a force of 82 N and moves a distance of 6 m across the floor. How much work was done in moving the couch? Round to a whole number.
Answer:
492J
Explanation:
How do we know that pulsars must be neutron stars?
a) We have observed massive-star supernovae produce pulsars.
b) This is only a theory that has not yet been confirmed by observations.
c) No massive object, other than a neutron star, could spin as fast as we observe pulsars to spin and remain intact.
d) Pulsars have the same upper mass limit as neutron stars do.
e) Telescopic images of pulsars and neutron stars look exactly the same.
Answer:
funny
Explanation:
The body needs small amounts of ________ to help enzymes break down proteins.
Answer:
I would say vitamin B-6
Explanation:
it is also known as pyridoxine. it helps ebzymes break down protein and carry the dismantled amino acids to the blood stream
Hope this helps ✌✌
Answer:
The body needs small amount of vitamin B-6 to help enzymes break down protein and carry the dismantled amino acids to the blood stream.
Calculati rezistenta filamentului unui bec al lanternei de buzunar daca la tensiunea de 3,5 v el este parcurs de un curent cu intensitatea de 0,28 A
Answer:
Resistencia = 12.5 Ohmios
Explanation:
Dados los siguientes parámetros;
Voltaje = 3.5 Volts
Corriente = 0.28 Amps
Para encontrar el resistencia;
La ley de Ohm establece que a temperatura constante, la corriente que fluye en un circuito eléctrico es directamente proporcional al voltaje aplicado en los dos puntos e inversamente proporcional a la resistencia en el circuito eléctrico.
Matemáticamente, La ley de Ohm viene dada por la fórmula;
Voltaje = corriente * resistencia
Resistencia = voltaje/corriente
Resistencia = 3.5/0.28
Resistencia = 12.5 Ohmios
Por tanto, la resistencia del filamento de una linterna de bolsillo es de 12,5 ohmios.
____________ is the rate at which the electric charges move through a given area.
Magnetism
Current
Induction
Flux
Answer:
current is the rate at which the electric charges move through a given areaNewton's law of cooling states that the temperature of an object changes at a rate proportional to the difference between its temperature and that of its surroundings. Suppose that the temperature of a cup of coffee obeys Newton's law of cooling. If the coffee has a temperature of 190190 degrees Fahrenheit when freshly poured, and 11 minutes later has cooled to 172172 degrees in a room at 6060 degrees, determine when the coffee reaches a temperature of 122122 degrees.
Answer:
4.9 minutes
Explanation:
Given; T(t) = Ce^-kt + Ts
Now;
T(t) = 190 degrees Fahrenheit
Ts = 60 degrees
To obtain C;
190 = Ce^0 + 60
190 - 60 = C
C = 130
Hence, to find k when t=11
172 = 130 e^-11k + 60
172 -60/130 = e^-k
e^-k = 0.86
ln(e^-k) = ln( 0.86)
-k = -0.15
k = 0.15
Hence at 122 degrees, t is;
T(t) = Ce^-kt + Ts
122 = 130e^-0.15t + 60
122 - 60/130 = e^-0.15t
0.477 = e^-0.15t
ln (e^-0.15t) = ln (0.477)
-0.15t = -0.74
t = 0.74/0.15
t = 4.9 minutes
A 1,000 kg car traveling 15.0 m/s brakes and comes to a stop after traveling 20.0 m.
a. What is the car’s initial kinetic energy?
b. What is the car’s final kinetic energy?
c. How much work does it take to stop the car?
d. How much constant force is applied in bringing the car to a stop?
A. The car’s initial kinetic energy is 112500 J
B. The car’s final kinetic energy is 0 J
C. The amount of work done to stop the car is –112500 J
D. The force applied in bringing the car to a stop is –5625 N
A. How to determine the initial kinetic energy Mass (m) = 1000 KgInitial velocity (u) = 15 m/sInitial kinetic energy (KEᵢ) =?KEᵢ = ½mu²
KEᵢ = ½ × 1000 × 15²
KEᵢ = 112500 J
B. How to determine the final kinetic energy Mass (m) = 1000 KgFinal velocity (v) = 0 m/sFinal kinetic energy (KEբ) =?KEբ = ½mv²
KEբ = ½ × 1000 × 0²
KEբ = 0 J
C. How to determine the workdone Initial kinetic energy (KEᵢ) = 112500 J Final kinetic energy (KEբ) = 0 JWorkdone (Wd) =?Wd = KEբ – KEᵢ
Wd = 0 – 112500
Wd = –112500 J
D. How to determine the forceWe'll begin by calculating the acceleration. This can be obtained as follow:
Initial velocity (u) = 15 m/sFinal velocity (v) = 0 m/sDistance (s) = 20 mAcceleration (a) =?v² = u² + 2as
0² = 15² + (2 × a × 20)
0 = 225 + 40a
Collect like terms
0 – 225 = 40a
–225 = 40a
Divide both side by 40
a = –225 / 40
a = –5.625 m/s²
Finally, we shall determine the force. This is illustrated below:
Mass (m) = 1000 KgAcceleration (a) = –5.625 m/s²Force (F) =?F = ma
F = 1000 × –5.625
F = –5625 N
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