Answer:
20km/h
Explanation:
Given parameters:
Distance moved = 24km
Time = 1.2hrs
Unknown:
Speed of her ride = ?
Solution:
Speed is the distance covered per unit of time.
So;
Speed = [tex]\frac{distance}{time}[/tex]
Speed = [tex]\frac{24}{1.2}[/tex] = 20km/h
10. If a wave has a frequency of 12 Hz and a wavelength of 3 meters,
what is its wave speed?
Answer: 36 m/s
Explanation:
Wave speed = Wavelength * Frequency
12 * 3 = 36 m/s
Answer: 36 m/s
Explanation:
two 100 kg astronauts are floating in space. the first astronaut is moving at 5 m/s while the second is at rest. the two astronauts collide. both astronauts are moving at 3 m/s. based on the information provided, which of the following statements is true?
Answer:
The true statement is;
Neither momentum or kinetic energy is conserved
Explanation:
The question relates to the verification of the conservation of linear momentum, and kinetic energy
The given parameters are;
The mass of each astronaut = 100 kg
From which, we have;
The mass of the moving astronaut, m₁ = 100 kg
The mass of the stationary astronaut, m₂ = 100 kg
The initial velocity of the moving astronaut, v₁ = 5 m/s
The initial velocity of the stationary astronaut, v₂ = 0 m/s
The final velocity of both astronauts, v₃ = 3 m/s
The sum of the initial momentum of both astronauts is given as follows;
[tex]P_{initial}[/tex] = m₁·v₁ + m₂·v₂ = 100 kg × 5 m/s + 100 kg × 0 m/s = 500 kg·m/s
[tex]P_{initial}[/tex] = 500 kg·m/s
The sum of the final momentum of the astronauts is given as follows;
[tex]P_{final}[/tex] = m₁·v₃ + m₂·v₃ = (m₁ + m₂) × v₃ = (100 kg + 100 kg) × 3 m/s = 600 kg·m/s
[tex]P_{final}[/tex] = 600 kg·m/s
∴ [tex]P_{initial}[/tex] = 500 kg·m/s ≠ [tex]P_{final}[/tex] = 600 kg·m/s
[tex]P_{initial}[/tex] < [tex]P_{final}[/tex], therefore, the sum of the linear momentum of both astronauts is not conserved
The sum of the initial kinetic energy of each astronaut is given as follows;
[tex]K.E._{initial}[/tex] = 1/2·m₁·v₁² + 1/2·m₂·v₂² = 1/2 × 100 kg × (5 m/s)² + 1/2 × 100 kg × (0 m/s)² = 1250 Joules
[tex]K.E._{initial}[/tex] = 1250 Joules
The sum of the final kinetic energy of the astronaut is given as follows;
[tex]K.E._{final}[/tex] = 1/2·m₁·v₃² + 1/2·m₂·v₃² = 1/2 × 100 kg × (3 m/s)² + 1/2 × 100 kg × (3 m/s)² = 900 joules
[tex]K.E._{final}[/tex] = 900 joules
[tex]K.E._{initial}[/tex] > [tex]K.E._{final}[/tex], therefore, the kinetic energy is not conserved
From which we get that neither momentum or kinetic energy is conserved.
particle has 17.5 joules of kinetic energy and 12.5 joules of gravitational potential energy at one point during its fall from a tree to the ground. An instant before striking the ground, how much mechanical energy — rounded to the nearest joule — does the particle have?
Answer:
Em = 30 J
Explanation:
The principle of conservation of mass and energy is one of the most important in physics, it establishes that energy cannot be created just by transforming it.
Therefore, the mechanical energy at a point is the same throughout the movement, only in some parts it will be kinetic, in others potential and in the intermediate points a mixture of the two, but the total value is always the same.
Em = K + U
Em = 17.5 + 12.5
Em = 30.0 J
At the point just before touching the ground the mechanical energy is the same Em = 30 J
If you run with an average speed of 3.9 meters per second for 1,200 seconds, then what distance will you have traveled?
Answer: 3.9 x 1200 = 4680
Explanation:
Please help me. I'll mark brainiest
During the course of a trajectory, is the vertical component of the velocity a constant or a changing value? ___________________ If it is a changing value, then describe its changes (increasing, decreasing, or ...)
Answer:
1) Changing value
2) The velocity is decreasing for upward motion and increasing for downward motion due to gravitational force
Explanation:
1) A trajectory is the motion of an object which is being acted upon by specified forces. The flight path of an object in projectile motion is its trajectory
During the course of a trajectory, the vertical component of the velocity, [tex]v_y[/tex], is a changing value
2) The vertical component of the velocity first decreases, during the upward motion, according to the following equation;
[tex]v_y[/tex] = [tex]u_y[/tex] - g·t
Where;
[tex]v_y[/tex] = The vertical component of the velocity after a given time, t
[tex]u_y[/tex] = The initial vertical velocity
t = The time of motion of the trajectory
g = The acceleration due to gravity ≈ 9.8 m/s²
When the vertical velocity of the object decreases to zero, which is the point at which the object reaches the maximum height of its motion, the direction of the vertical motion of the object reverses, and object begins to accelerate and increase its velocity downwards according to the following equation;
[tex]v_y[/tex] = [tex]u_y[/tex] + g·t
Therefore, the velocity of the object is decreasing on its way up, and then increasing on its way down.
If an 80 kg swimmer pushes off a pool wall with a force of 250 N, what is her
acceleration?
Answer:
Explanation:
Force = Mass*Acceleration
Remember this formula because its one of the most used formula in all of physics.
250N = 80kg*Acceleration
a = 3.125 m/s^2
There would definitely be friction because of the water, but since this says high school physics, you prolly can assume it to be negligible
When electricity moves through a metal wire, the wire is
A. A resistor
B. A conductor
C. an insulator
D. a power supply
When electricity moves through a metal wire, the wire is option B. A conductor.
What is a Conductor?Conductors are materials that allow electricity to flow easily through them. An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow and causes resistance.The flow of electricity through a wire is the flow of electrons. An electron is a negatively charged subatomic particle. In electrical conductors, the flow of electricity results from the movement of electrons from one atom to the next.To learn more about conductors, refer to: https://brainly.com/question/27533161
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The mass of an object is the measure of what characteristic of the object?
O A. its volume
OB. the space it occupies
OC, the amount of matter it has
OD. its weight
ANSWER PLZ
Answer:
C. The amount of matter it has
Sodium and phosphorus combine to form Na3P. What is the name of this compound? phosphorus sodiate phosphorus sodide sodium phosphate sodium phosphide
Answer:
Sodium phosphide
Explanation:
Answer:
sodium phosphide
Explanation:
i just took the test. Good luck!! Have a great day!!
Can someone help me solve this?
Answer:
so the answer is number one which is A
what is the work done when a 400.n force is use to lift a 400.n object 3.5 meters strait up
Answer:
i think it's 1400
Explanation:
w = Force x displacement
w = 400 x 3.5
Why don't you notice your gravitational force on other objects?
A. too much interference
B. distance is too big
C. not enough mass
D. you don't exert a gravitational force
Answer:
C. not enough mass
Explanation:
Trust me bro
What is the net force on this box?
100 N
80N
90 N
110
100 N
Answer:
where is the box? how can we answer if your question is lack given? how do we know what box is it your talking about
PLEASE PLEASE
HELP!!!!!!!!
Answer:
b 8W
Explanation:
i dont know u find out
Answer:
B. 8 I believe that this is the answer
LOOK AT PICTURE FOR QUESTION
What is the second daughter element from the nuclear fission reaction shown below? (solve
for x) *
(3 Points)
Answer:Cs
Explanation: for this one 92-37 is 55
1. Convert the following to Scientific notation
A) 0.005
which forces are contact forces give one example of each
Answer:
A contact force is any force that requires contact to occur. Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter. Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.
Encuentra la magnitud y dirección de la suma de los siguientes vectores: A= 7m al noreste B= 12m 50° al oeste del norte
A rocket has a mass of 80,000 kg and accelerates at a rate of 35 m/s2. Calculate the force that provides this acceleration,
Explanation:
Given
Mass(M) = 80,000 kg
Acceleration (a) = 35 m/s²
Force (F) = ?
We know we have the formula
F = m * a
= 80000 * 35
= 2800000
= 2.8 * 10 ^ 6 N
The force is 2.8 * 10 ^ 6 N.
Hope it will help :)❤
If a rocket has a mass of 80,000 kg and accelerates at a rate of 35 m/s2. then the force that provides this acceleration would be 2800000 Newtons.
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The mathematical expression for Newton's second law is as follows,
F = m*a
As given in the problem we have to find the force that provides the acceleration of 35 meters / second², if the rocket has a mass of 80,000 kg,
The force acting on the rocket = 80,000 × 35
= 2800000 Newtons
Thus, the force acting on the rocket would be 2800000 Newtons.
To learn more about Newton's second law here, refer to the link;
brainly.com/question/13447525
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Which of the following best describes what displacement is?
o displacement is a vector, it must have magnitude only
o displacement is a scalar, it must have magnitude and direction
o displacement is a scalar, it must have magnitude only
o displacement is a vector, it must have magnitude and direction
A car accelerates from 20.0 m/s to 28.0 m/s over a distance of 50.0 m. What is the car’s acceleration?
Answer:
Explanation:
[tex]V^2=V^2_o+2a(x_f-x_i)[/tex]
[tex]28^2=20^2+2a(50)\\784=400+100a\\384=100a\\a=3.84m/s^2[/tex]
Which is the main purpose of an experimental conclusion?
O A. to describe the steps in an experiment
O B. to state whether a hypothesis has or has not been
supported
O C. to criticize the observations that led to the investigation
O D. to explain how data was collected
Answer:
the Answer is B
because the purpose of experimental conclusion it is to prove rather is a right or wrong is a hypothesis is right or wrong
A car is pushed with a force of 450 N for 19.4 seconds. What impulse was applied to the car?
Answer:
impulse = 8820 kg·[tex]\frac{m}{s}[/tex] or 8820 N·s
Explanation:
Impulse J is equal to the average force [tex]F_{av}[/tex] multiplied by the elapsed time Δt or in equation form, J = [tex]F_{av}[/tex]Δt
As long as your force of 450 N is constant then that value is your average force [tex]F_{av}[/tex] and your elapsed time is 19.4 seconds.
Multiply these values.
You will get an impulse of 8820 kg·[tex]\frac{m}{s}[/tex] or 8820 N·s.
A 1-kg plastic block is neutrally buoyant when submerged in water with a density of 1 g/cm3. If the same block is placed, such that it is completely submerged, in a container of oil with a density of 0.8 g/cm3, find the acceleration of the block.
Answer:
-2 m/s
Explanation:
The computation of the acceleration of the block is as follows:
The volume of the block is
V = 1kg ÷ 1,000 kg/m^3 = 1 ÷ 1,000 m^3
Now at the time of submerging in the oil
Net force is
[tex]m_g - F_B = m \times (-a)\\\\m_g - v\times S_{oil} \times g = -ma\\\\a = (\frac{v}{m} \times S_{oil} - 1) g\\\\= (\frac{1}{1000} \times 0.8 \times 1000 -1 ) \times 10\\\\[/tex]
= -2 m/s
The half-life of carbon-14 is 5370 years. The carbon-14 levels in a fossil indicate that 6 half-lives have passed. How old is the fossil?
75,200 years
35,000 years
32,220 years
50,000 years
Answer:
32200
6*5370
Explanation:
How is electric charge different than gravity? A. Electric charge has a smaller constant B. Gravitational force can only be positive C. Charges can be either positive or negative for electric charge D. The calculation of the radius is different
B and C are both true statements.
Which of these can spread a pathogen?
Answer:
there is no image to go off of. If you could share that I would be happy to help.
Explanation:
Please share the image!
Will give brainliest, Pleaseee help!!!
The girl is pulling the wagon at an angle of 36.9 degrees. She is pulling with a force of 50N and the boy is pushing with a force of 30N. The mass of the wagon and books together is 90 KG. Determine the force of gravity and the normal force acting on the wagon and books.
Answer:
below
Explanation:
1.1115 im not sure tho
Describe the relationship between frequency and wavelength.
Answer:
frequency is equal to the wavelength multiply by the speed of light
Explanation:
wavelength multiply by the speed of light Will give you the frequency
