Answer:
the basketball player must leave the ground with a velocity of 4.748 m/s
Explanation:
Given that data in the question;
From the third equation of motion;
v² - u² = 2as
such that;
u² = v² - 2as
where u is the initial velocity, v is the final velocity, s is the displacement and a is acceleration
so initial velocity of the basket ball player will be;
u = √( v² - 2as )
so from the question; s is 1.15 m and a = - 9.8 m/s² { player is under negative acceleration to get to the ball } and final velocity of the player will be 0.
so we substitute
u = √( (0)² - (2 × -9.8 × 1.15 )
u = √ -( - 22.54 )
u = √ ( 22.54 )
u = 4.748 m/s
Therefore, the basketball player must leave the ground with a velocity of 4.748 m/s
¿Cuál es la intensidad del campo eléctrico a una distancia de 2 m de una carga de -12μC? *
Answer:
Una secadora de cabello tiene una resistencia de 10Ω al circular una corriente de 6 Amperes, si está conectado a una diferencia de potencial de 120 V, durante 18 minutos ¿Qué cantidUna secadora de cabello tiene una resistencia de 10Ω al circular una corriente de 6 Amperes, si está conectado a una diferencia de potencial de 120 V, durante 18 minutos ¿Qué cantidad de calor produce?, expresado en caloríasad de calor produce?, expresado en calorías
Which statement is true about liquids? They are invisible.
They are always the same temperature.
They retain their shape.
They take the shape of their container.
Answer:
They take the shape of their container.
I think since they move around and fit into anything perfectly.
A car is sitting still what could cause the car to move
How can I become an astronaut I'm currently 13 urs old
What object currently has the most gravitational potential energy?
A, B, C, or D
Answer:
A
Explanation:
this because
gravitational potential energy = mass x height x gravitational field strength
so let's assume mass is 2 kg and gravitational field strength is 10 N /kg
so when height is very low, take it as 3 m
gravitational potential energy= 2 x 3 x 10 = 60 j
but when height is 6m
gravitational potential energy = 2 x 6 x 10 = 120 j
so when the height is the greatest, the gravitational potential energy is the highest
so A is the heighest so it has the highest gravitational potential energy.
hope this helps
please mark it brainliest :D
The diagram below represents a light ray striking the boundary between air and glass. What would be the angle between this light ray and its reflected ray?
30°
60°
120°
150°
Answer:
120°
Explanation:
straight line = 180°
light ray = 30°
the reflection will be like a mirror image
30°+30° = 60°
180° - 60° = 120°
The angle of incidence and the angle of reflection are equal
The correct option for the angle between the given light ray and the reflected ray is the option;
120°
Reason:
The given parameter are;
The angle formed by the light ray and the glass surface = 30°
Required:
To find the angle between the light ray and the reflected ray
Solution:
According to the laws of reflection, the angle between the incident ray and the normal is equal to the angle made between the reflected ray and the normal
The angle made between the incident ray and the normal, [tex]\theta _i[/tex] = 90° - 30° = 60°
Therefore, according to the laws of reflection, we have;
The angle made between the reflected ray and the normal, [tex]\theta _r[/tex] = The angle between the incident ray and the normal, [tex]\theta _i[/tex] = 60°
The angle made between the reflected ray and the normal, [tex]\theta _r[/tex] = 60°
The angle between the given light ray and reflected ray, θ = [tex]\theta _i[/tex] + [tex]\theta _r[/tex]
∴ θ = 60° + 60° = 120°
The angle between the given light ray and the reflected ray, θ = 120°
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What is the resultant?
1400 N
643 N
why are the layers of the earth in the order that they are in?
Answer:
Each layer has its own properties, composition, and characteristics that affects many of the key processes of our planet. They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core.
Explanation:
Bronco the skydiver, whose mass is 100 kg experiences 200 N of air resistance. What is the acceleration of his fall? Show Work, Please help this is due at 11:59
Answer:
Acceleration = 2 m/s²
Explanation:
Given the following data;
Mass = 100 kg
Force = 200 N
To find the acceleration of Bronco's fall;
Mathematically, force is given by the formula;
Force = mass * acceleration
Substituting into the formula, we have;
200 = 100 * acceleration
Acceleration = 200/100
Acceleration = 2 m/s²
Therefore, the acceleration of his fall is 2 meters per seconds square.
Joe follows the procedure below to make a compass.1. Move a magnet from the top of a needle to its point fifty times.2. Lay the needle on a cork that is floating in a bowl of water.3. Observe the direction that the needle points.What is the purpose of step 1
Answer:
The purpose of step 1 is to induce magnetism into the needle, so that it retains magnetism and behaves as a magnet after the process.
Explanation:
The method of production the needle magnet in the procedure is the single stroke. This process involves a continuous stroking of a magnetic object (e.g needle) repeatedly for a period or number of times with a permanent magnet. Thus, when the permanent magnet is removed, the object retains magnetism, and behaves like a magnet.
The importance of the stroking process is the turn a magnetic object to a magnet by inducing magnetism into it.
When placed at a certain point, a
0.110 C charge feels an electric
force of 19.8 N. What is the
magnitude of the electric field at
that point?
Answer: 180
Explanation: Acellus
This equation gives the magnitude of the electric field generated by a point charge Q. The distance r in the denominator is the separation between the point of interest and the point charge Q. Or the center of a spherical charge.
What magnitude of the electric field at that point?It is simple to determine the size of the electric field by calculating the force per charge on the test charge. From this definition, the common metric units for electric field strength are derived. Electric field units would be force units divided by charge units, as the definition of an electric field is a force per charge.
F = |qvBsin()| calculates the magnetic force's magnitude. The following factors are involved in determining the force's direction. A plane is first defined by the magnetic field vector, B, and the velocity vector, v. In or out of this plane, the magnetic force is perpendicular to it.
Therefore, The electric force F, or Coulomb force, exerted per unit positive electric charge q at that place can be used to determine an electric field's strength, or E = F/q.
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In a certain material, a beam of monochromatic light (f=5.09 × 10^14 Hz) has a speed of 2.04× 10^8 meters per second. The material could be
Question 14 options:
crown glass (n=1.52)
flint glass (n=1.66)
glycerol (n=1.47)
water (n=1.33)
Answer:
The Answer to question 14 is : glycerol (n=1.47)
The material should be considered as the glycerol (n=1.47).
Calculation of the material:Since
a beam of monochromatic light (f=5.09 × 10^14 Hz) has a speed of 2.04× 10^8 meters per second.
Now the material should be
= 3*10^8 / 2.04× 10^8
= 1.47
Hence, The material should be considered as the glycerol (n=1.47).
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1. Explain what the frequency of a transverse wave is.
2. What happens to the wave when you set the amplitude to 0 mm?
3. What happens when you move the amplitude to 40 mm?
4. Explain what the amplitude of a transverse wave is.
Explanation:
I am not understanding your question
"Heat conduction to skin": Suppose 175 W of heat flows by conduction from the blood capillaries beneath the skin to the body's surface area of 1.5 m2. If the temperature difference is 0.70°C, estimate the average distance of capillaries below the skin surface.
Answer:
Explanation:
Thermal conductivity of human skin K = 21 W / m²
Formula for heat conduction
Q = KA ( θ₂ - θ₁) / d
A is surface area , θ₂ - θ₁ is temperature difference , d is thickness .
Putting the values
175 = 21 x 1.5 x .70 / d
d = .126 m
= 12.6 cm .
newton's second law states that when a net force acts on an object, it accelerates it.Explain how it would be possible for two or more forces to act on object without accelerating it
Answer:
See Explanation
Explanation:
According to Newton's second law of motion, the acceleration of a body is proportional to the net external force that acts on the body.
A body accelerated when it is acted upon by an unbalanced net external force.
When the external forces acting on a body are balanced, the effect of each force is cancelled by the other hence the body is not accelerated according to Newton's second law.
A 0.5-kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s. If the impulse occurs for a time duration of 0.01 s, find the magnitude of the net force on the ball.
Answer: 350 N
Explanation:
Given
Mass of ball is [tex]0.5\ kg[/tex]
Speed of ball after rebound is [tex]v=2\ m/s[/tex]
Time period for impulse [tex]t=0.01\ s[/tex]
Impulse imparted in equal to the change in the momentum of object
[tex]\Rightarrow J=m(v-u)\quad [\text{u=speed of ball before collision}]\\\Rightarrow J=0.5\times \left(2-(-5)\right)\\\Rightarrow J=0.5\times 7\\\Rightarrow J=3.5\ N.s[/tex]
Impulse is the product of average force and duration of application
[tex]\Rightarrow J=F_{avg}\cdot \Delta t\\\Rightarrow 3.5=F_{avg}\times 0.01\\\\\Rightarrow F_{avg}=350\ N[/tex]
If the oil film becomes dark when the path length difference is less than one fourth the wavelength, what is the thickest the oil film can be and appear dark at all visible wavelengths
His question is incomplete, the complete question is;
A film oil on water will appear dark when it is very thin, because the path length difference becomes small compared with the wavelength of light and there is a phase shift at the top surface.
If the oil film becomes dark when the path length difference is less than one fourth the wavelength, what is the thickest the oil film can be and appear dark at all visible wavelengths. Oil has an index of fraction of 1.40.
In this question, assume the wavelength visible light is in the range of 400 nm to 700 nm.
Answer:
the minimum thickness of the oil for destructive interference to occur is approximately 35.714 nm
Explanation:
Given the data in the question;
Path difference for destructive interference between the two reflected waves ( top and bottom );
δ = 2nt ---------- let this be equation 1
Also, for one path difference of reflected waves, one fourth of the wavelength of reflected waves;
δ = λ/4 ---------- let this be equation 2
from equation 1 and 2;
δ = δ
2nt = λ/4
we find t;
8nt = λ
t = λ / 8n
given that; λ[tex]_{minimum[/tex] = 400 nm and n = 1.40
we substitute
t = 400nm / 8(1.40)
t = 400nm / 11.2
t = 35.7142857 ≈ 35.714 nm
Therefore, the minimum thickness of the oil for destructive interference to occur is approximately 35.714 nm
How would a person who believes in the geocentric solar
system model explain the movement of the sun across
the sky during the day?
Select one:
A.The sun is revolving around a stationary Earth.
B.Earth is revolving around a stationary sun.
C.Both Earth and the sun are stationary; the movement is
due to Earth's rotation.
D.The sun is revolving around the moon, which in turn is
revolving around Earth.
Please Help!!!!
Your Best friend gets on a ship and travels away fast. They return 10.0 years later and I’ve only aged 4.00 years. How fast was your friend traveling? Give your answer as ex. 0.5c
Answer:
v = 0.92 c
Explanation:
Here, we will use the time dilation formula from Einstein's theory of relativity to find the speed of traveling of the friend:
[tex]t =\frac{t_o}{\sqrt{1-\frac{v^2}{c^2}}} \\\\\\\sqrt{1-\frac{v^2}{c^2}}=\frac{t_o}{t}\\\\[/tex]
where,
v = speed of traveling = ?
c = speed of light
t = time of return = 10 years
t₀ = time passed on earth = 4 years
Therefore,
[tex]\sqrt{1-\frac{v^2}{c^2}} = \frac{4\ years}{10\ years}\\\\ 1-\frac{v^2}{c^2}=(\frac{2}{5})^2\\\\\frac{v^2}{c^2} = 1-\frac{4}{25}\\\\\frac{v^2}{c^2} = \frac{21}{25}\\\\v^2 = 0.84c^2\\\\[/tex]
v = 0.92 c
Since a light year is a unit of astronomical distance equal to the distance light travels in one year, which phrase best completes the sentence? The distance from the sun to Earth would be ___________.
Question 3 options:
exactly one light year
less than one light year
any number of light years
more than one light year
Answer:
less than one light year
Explanation:
earth is 0.00001581 light years away from the sun :)
Friction _____.
1.happens whenever work is done
2.occurs when objects rub against each other
3.releases energy as heat
4.all of the above
Answer:
all above
Explanation:
friction is necessary to live
Answer:
All of above
Explanation:
Which explanation best describes a wave?
A.
a disturbance that travels through a medium with a transfer of energy and matter
B.
a disturbance that travels through a medium without a transfer of energy and matter
C.
a disturbance that travels through a medium with a transfer of energy and without a transfer of matter
D.
a disturbance that travels through a medium with a transfer of matter and without a transfer of energy
E.
a disturbance that travels only in the absence of a material medium
Answer:
C. a disturbance that travels through a medium with a transfer of energy and without a transfer of matter
Explanation:
A wave is any disturbance that transfers energy from one location to the other via a substance called medium. It is important to note that a wave only conveys energy and not matter. For example, sound wave is a type of wave that carries sound energy from one place to another via mediums such as water, air etc.
Hence, according to this question, a wave can be described as a disturbance that travels through a medium with a transfer of energy and WITHOUT A TRANSFER OF MATTER.
can you explain the three main important reason why we use machine
Answer:
HERE IS YOUR ANSWER
Explanation:
1. The machines makes pur life easier.
2. It makes us do our works faster.
3. It does all the works that are harder for us.
Hope it helps you.
Explanation:
First of all some do most of the work for us
Second, us humans are quite lazy
Third, it makes it quite easier in life
(b) A lift (elevator) in a high building transports 12 passengers, each of mass 65 kg, through a
vertical height of 150 m in a time of 64 s.
(0) Calculate the power needed to transport the passengers through this height.
power =
Explanation:
P =F * v
F = m * a = 65 kg * 9.81 ms^-2 * 12 passengers
v = d/t = 150m / 64 s
I think you can calculate and substitute this units should be watts
The power needed to transport the passengers through this height is 17.933 KW or 17933 Watts.
What is Power?Power can be defined as the rate at which work is done by an object. Power can be calculated by the formula:
P = W × t
where, P = power, w = work done, and t = time taken.
The SI unit for power is the watt (W), where 1 watt power is equal to 1 joule/second (1W = 1J/s). Because, the work done by an object is the energy transfer by the object, and power is also the rate at which energy is expended.
P = F × v
where, P = Power, F = Force, and V = velocity of the object
F = m × a = 65 kg × 9.81 ms⁻² × 12 passengers = 7651.8
v = d/t = 150m / 64 s = 2.343
P = 7651.8 × 2.343
P = 17,933.90
P = 17.933 KW
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A force is applied to a 12 kg box. The force is applied parallel to the motion of the box. Determine the force acting on the box if it moves 22 meters and increases the box’s speed from 10 m/s to 25 m/s.
Answer:
Force = 143.16 Newton
Explanation:
Given the following data;
Distance, S = 22 m
Initial velocity, U = 10 m/s
Final velocity, V = 25 m/s
Mass = 12 kg
To find the force acting on the box;
First of all, we would determine the acceleration of the box using the third equation of motion;
V² = U² + 2aS
25² = 10² + 2*a*22
625 = 100 + 44a
625 - 100 = 44a
525 = 44a
Acceleration, a = 525/44
Acceleration, a = 11.93 m/s²
Next, we find the force;
Force = mass * acceleration
Force = 12 * 11.93
Force = 143.16 Newton
Select all the correct answers.
A worker is holding a filled gas cylinder still. Which two sentences are true about the energy of the filled gas cylinder?
It has no energy because it's being held still
it has gravitational potential energy because of its height
its atoms and molecules have thermal energy
it has motion energy because it will fall if let go
its kinetic energy is being converted to potent energy
Answer:
b and c
Explanation:
its correct
If humans cannot see ultraviolet waves, how can ultravoilet light be used to gather evidence of a crime?
Answer: The question is incomplete because the options are not given here are the options gotten from Another website.
A. Ultraviolet light detects the presence of radioactive substances.
B.Ultraviolet light shows cold areas as blue and warm areas as red.
C.Ultraviolet light causes substances to fluoresce and give off visible light.
D. Ultraviolet light transmits information to AM and FM radio receivers.
The correct option is C.
Ultraviolet light causes substances to fluoresce and give off visible light
Explanation:
This is because UV light radiates at a very short wavelengths compared to visible light which is impossible for humans to see it. Therefore , when UV light is absorbed by some particular materials, it reflect back towards the eye as visible radiation with a longer wavelength .This process is called UV-induced visible fluorescence.
5- A 2.0 kg block of aluminum (specific heat = 897 J/kg·K) is at an initial temperature of 300 K. What will its final temperature be if (3.35 × 105 J )of thermal energy is transferred to the block?
Answer:
T = 486.6 K
Explanation:
The final temperature of the block can be found using the following formula:
[tex]Q = mC\Delta T\\[/tex]
where,
Q = Thermal Energy Transferred = 3.35 x 10⁵ J
m = mass of aluminum block = 2 kg
C = Specific Heat = 897 J/kg.K
ΔT = Change in Temperature = T - 300 K
T = Final Temperature of the Block = ?
Therefore,
[tex]3.35\ x\ 10^5\ J = (2\ kg)(897\ J/kg.K)(T-300\ K)\\\\5.38\ x\ 10^5\ J + 3.35\ x\ 10^5\ J = (1794 J/K)(T)\\\\T = \frac{8.73\ x\ 10^5\ J}{1794\ J/K}[/tex]
T = 486.6 K
Three 7-ohm resistors are connected in parallel with an ideal 12-volt battery. What is the equivalent resistance of the circuit?
Answer:
Equivalent Resistance of Resistors in Parallel is
1/R = 1/r1 + 1/r2 .....
1/R = 1/7 + 1/7 + 1/7
R= 7/3
R=2.33ohms
After performing a long equation using the conservation of mechanical energy you get a final answer that is negative. What does this mean?
A. Because energy is scalar it means that the energy is less than 0.
B. Because energy is scalar it means that the energy was transferred somewhere else.
C. Because energy is a vector it means that the energy was destroyed in the opposite direction.
D. Because energy is scalar it means that the energy was destroyed.
Answer:
The correct option is D.
Explanation:
The energy is the capacity to do work.
There are several types of energies.
1. kinetic energy : it is due to the motion of the body.
2. Potential energy : It is due to the position or the configuration of the body.
3. Mechanical energy: The sum of the kinetic energy and the potential energy is called mechanical energy.
The energy is a scalar quantity.
According to the law of conservation of energy, the energy can not be created and cannot be destroyed, it can transformed from one form to another.
When we get the mechanical energy negative, it means the energy was destroyed in some other forms of energy.