Answer:
128.8 N/m
Explanation:
Frequency for a spring attached oscillating mass is f=1/2π[tex]\sqrt{k/m][/tex],
where k is the stiffness of the spring (or spring constant) and m is the mass
Solving for k
f²(4[tex]\pi^{2}[/tex])=k/m
k=m(f²(4[tex]\pi^{2}[/tex]))=2000(16·4·3.14²) = 1262/9.8=128.8 N/m
A 100 kg steel beam is being lifted by a crane to the top of 15 meter building. How much Potential Energy is in the steel be a m when it reaches the top of the building.
which statement is an example of the law of conservation of energy
Answer:
The law of conservation of energy can be seen in these everyday examples of energy transference: Water can produce electricity. Water falls from the sky, converting potential energy to kinetic energy. This energy is then used to rotate the turbine of a generator to produce electricity.
Explanation:
Answer:
When a light bulb is turned on, electrical energy is converted to light and heat.
Explanation:
got it right :)
CORRECT ANSWER GETS BRANLIEST PLZ HELP
1. What is the velocity of a car that traveled a total of 85 km South in 5 hours?
2. A plane traveled 3000 miles from New York to Los Angeles in 5 hours. What is the plane’s
velocity?
Answer:
I think 1. is 17 and 2. is 600
Explanation:
sorry its been a while..
A handball is hit toward a wall with a velocity of 14.3 m/s in the forward direction. It returns with a velocity of 13.5 m/s in the backward direction. If the time interval during which the ball is accelerated is 0.011 s, what is the handball's average acceleration?
Answer:
Let's define t = 0 as the moment when the ball hits the wall.
in this moment, we have a given acceleration, but if we only want to calculate the average acceleration, then let's consider the acceleration constant.
a(t) = A.
To find the velocity equation we should integrate, and the constant of integration will be the initial velocity, in this case, is 14.3m/s.
v(t) = A*t + 14.3m/s
Now we know that at t = 0.011s, the velocity is -13.5m/s (the sign is negative because the ball is moving in the opposite direction as before).
Then we can solve the equation:
v(0.011s) = -13.5m/s = A*0.011s + 14.3m/s
Now we can solve it for A, the average acceleration:
-13.5m/s - 14.3m/s = A*0.011s
(-27.8m/s)/0.011s = A = -1313.5 m/s^2
PLEASE HURRY AND HELP
What is the correct unit for acceleration?
A. m
B. m/s
C. m/s2
please help me with this question asap
In a complete description of a force vector, which is usually not necessary?
Answer:
Position
Explanation:
A force vector has both magnitude and direction, which can be represented by a line with an arrow head. The length of the line describes magnitude, while the arrows points in the required direction.
generally, the position of a vector is unimportant when describing the vector. Thus, when a force vector is to be described, it is unnecessary to make reference to its original position. Majorly, its magnitude and direction is considered.
State Newton’s first law of motion in your own words.
Answer:
An object in motion will stay in motion until an outside force is acted upon it.An object at rest will stay at rest until an outside force acts upon it.
Explanation:
Answer:
An object in motion will stay in motion until an outside force is acted upon it. An object at rest will stay at rest until an outside force acts upon it.
Explanation:
What is the momentum of a baseball with a mass of 4 kg being thrown at a velocity of 84 m/s towards the hitter
Answer:
The answer is 336 kgm/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocityFrom the question
mass = 4 kg
velocity = 84 m/s
We have
momentum = 4 × 84
We have the final answer as
336 kgm/sHope this helps you
4. An object is thrown vertically upward with a speed of 25 m/s. How much time passes before it
comes back down at 15 m/s? (Air resistance is negligible.)
a. 1.0 S
d. 18 s
b. 4.1 s
e. 27 s
c. 9.85
Can you also explain how you got the answer please?
Answer:
Option b is correct: 4.1 s
Explanation:
Vertical Launch
An object launched thrown vertically upward where air resistance is negligible, reaches its maximum height in a time t, given by the equation:
[tex]\displaystyle t=\frac{v_o}{g}\qquad\qquad[1][/tex]
Where vo is the initial speed and g is the acceleration of gravity g=9.8 [tex]m/s^2[/tex].
Once the object reaches that point, it starts a free-fall motion, whose speed is (downward) given by:
[tex]v_f=g.t\qquad\qquad[2][/tex]
The object considered in the question is thrown with vo=25 m/s. The time taken to reach the maximum height is given by [1]:
[tex]\displaystyle t=\frac{25}{9.8}=2.551\ sec[/tex]
The object starts its falling motion and at some time, it has a speed of vf=15 m/s. Let's find the time by solving [2] for t:
[tex]\displaystyle t=\frac{15}{9.8}=1.531\ sec[/tex]
The total time taken by the object to go up and down is
[tex]t_t=2.551\ s+1.531\ s=4.081\ s[/tex]
a. This option is incorrect because it's far away from the answer.
d. This option is incorrect because it's far away from the answer.
b. This option is correct because it's a good approximation to the calculated answer.
e. This option is incorrect because it's far away from the answer.
c. This option is incorrect because it's far away from the answer.
During an ,
experiment, a siginal from a spaceship
reached the ground station in five minutes. What was the
distance of
the spaceship from
the ground station? The
signal travels at the speed of light, that is 3x 109 ms‐1
Answer:
1.5*10^9
Explanation:
distance =V x T
=3x10^8x5
=1.5*10^9
Which has more momentum, a 2.0 kg dog at 41 m/s or a 75 kg pony at 1.0 m/s?
Answer:
The dog has more momentum than the pony.
Explanation:
To solve this problem, we must remember the formula for calculating momentum, which is given below:
momentum = p = m*v
where m represents the mass of the object and v represents the velocity of the object
Using this knowledge, let's calculate the momentum for the dog and the pony.
Dog: p = m*v = (2kg)*(41 m/s) = 82 kg*m/s
Pony: p = m*v = (75kg)*(1 m/s) = 75 kg*m/s
Since 82 > 75, we can conclude that the dog has more momentum.
Hope this helps!
Silvia rides her bike 2.7km to school. After school, she rides an additional 1.3 km to the mall in the opposite direction. What is her total distance traveled?
Answer:
4.0 km
Explanation:
Total distance traveled doesn't care about direction:
Total distance traveled = 2.7km + 1.3 km = 4.0 km
what is the properties of polarization
Answer:
Explanation:
The polarization characteristics depend on the shape, size, and optical properties of the surface particles. Generally, the radiation is linearly polarized and is said to be negatively polarized if it lies in the scattering plane and positively polarized if it is perpendicular to the scattering plane.
as a car skids to a stop, friction transforms kinetic energy to
Answer:
potential energy
Explanation:
PLEASE HELP ME WILL GIVE BRAINLIEST
The horizontal and vertical components of a projectile's velocity are......
A. always changing
B. independent of each other
C. dependent on each other
D. always equal
Answer:
A.always changing
Explanation:
Answer:
always equal
The horizontal and vertical components of a projectile's velocity is always equal. The horizontal and vertical have different charges.
Use the information below to solve this problem: A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters. Question 2 options: 0.6945 m 0.7204 m 1.439 m 343 m
Answer:
Option (1). 0.6945 m
Explanation:
Frequency of a B note = 493.88 Hz
Speed of sound in the air = 343 meters per second
Since, formula to calculate the wavelength of a note is,
λ = [tex]\frac{v}{f}[/tex]
By substituting the given values in the formula,
λ = [tex]\frac{343}{493.88}[/tex]
λ = 0.6945 m
Therefore, wavelength of the music note is 0.6945 m.
Option (1) will be the answer.
What is the magnitude of the gravitational force acting on the car?
A) 14700N
B)13690N
C)5800N
D)775N
The magnitude of the gravitational force acting on the car is 14700 N.
What is gravitational force?In mechanics, gravity, often known as gravitation, is the force of attraction that acts on all matter. It has little impact on determining the intrinsic characteristics of common stuff because it is by far the weakest known force in nature.
In contrast, it governs the formations and evolution of stars, galaxies, and the entire cosmos by its extensive and ubiquitous action, which affects the trajectories of objects in the solar system and beyond the universe.
In this free body diagram: 14700 N force acting downwards due to its weight. Hence, it is the magnitude of the gravitational force acting on the car.
Learn more about gravitational force here:
https://brainly.com/question/12528243
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x = 20
v = 3.5 m/s
t = ?
Answer:
16.5 I think
Explanation:
12. A train is traveling away from you at a constant speed.
What would a distance-time graph look like for this train?
Answer:
b
Explanation:because think about it its going straight so you have to coiunt the miles the train is going and boom your answer is b
Answer:
It would be choice b
Explanation:
speed is constant so they value won't change, on the other hand time is always going.
A ball is thrown straight upward and returns to the thrower's hand after 3 seconds in the air. A second ball is thrown at an angle of 30 degrees with the horizontal. At what speed (remember that this is the resultant magnitude of the vertical and horizontal speeds) must the second ball be thrown so that it reaches the same height as the one thrown vertically?
Explanation:
Given that the first ball is thrown vertically and upward.
since it reaches the throwers hand after 3 seconds, then the time taken to reach maximum height is
= T/2
=3/2
=1.5 seconds
Also, the projection angle for the second ball is 30°
we know that at maximum height vertical velocity is 0
therefore the final velocity of the first ball is
Vy= 0
Also, since the first ball is thrown upward the horizontal velocity is 0
Vx=0
from the first law of motion
Vy=u+at
Vy=0, a= -g
Uy=gt
Uy=9.81*1.5
Uy=14.7m/s
since both reach the same height, they will have the same vertical velocity
Uy= Vo sin∅
Vo=Uy/sin∅
Vo= 14.7/sin 30
Vo=29.4m/s
I really need help with this question, I can't wrap my brain around this.
region 4: warm, low pressure air
region 1: higher pressure air fills vacancy from low pressure air
region 3; cool high pressure air
region 2: warm air cools and increases in pressure.
if Sarah melts 10g of tin. What mass of melted tin would she have at the end of the experiment?
Answer:
10g
Explanation:
As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".
Though melting of tin isn't a chemical change, the same logic is applied here...
Hence,
The mass of tin will be 10 g itself...
Answer:
10g
Explanation:
The experiment is about melting of tin. When solid tin is melted, it retains the amount of substance it originally has and we expect it to still be 10g.
Mass is the quantity or amount of matter contained in a substance. For most chemical processes, the law of conservation of matter is always succinctly observed.
The law states that "matter is neither created nor destroyed in a chemical reaction or process". Although melting is a phase change, we can adapt this law to the process. Owning to no loss of matter in the melting procedure, the amount of substance remains the same.
Therefore, we are left with about the same mass of substance we started with which is 10g.
difference between
Atmospheric pressure and Liquid pressure.
Answer:
one is Atmospheric and one is a Liquid
Explanation:
The temperature of a sample of iron with a mass of 10.0 g changed
from 50.4°C to 25.0°C with the release of 114.3 J of heat. What is the
specific heat of iron
Answer:
Q = mc(θ₂-θ₁)
47 calories = 10 g *c*(50.4 - 25)
47cal = 10*c* 25.4
47 /(10*25.4) = c
0.185 = c
Specific heat of iron = 0.185 cal/g°C
Explanation:
A trainer is training a horse for the Kentucky Derby. The trainer knows the horse needs to have an opening acceleration of 10 m/s^2. If the horse has a mass of 450 kilograms, how much force will the horse need to produce to reach the needed acceleration?
2500 N
4500 N
3500 N
3000 N
Answer:
4500 N
Explanation:
Acceleration = 10 m/s²
Mass = 450 kilograms
Force = ?
[tex]force \: = mass \times acceleration \: \\ force \: = 450 \times 10 \\ force = 450[/tex]
Force = 450 Newton
An object moves in a straight path. Its position x as a function of time t is presented by the equation x(t) = at – bt2+c, where a = 1.4 m/s, b = 0.06 m/s2 and c =50 m. a. Calculate the average velocity of the object for the time interval t = 0 to t = 5 s b. Calculate the average velocity of the object for the time interval t = 0 to t = 10 s c. Calculate the average velocity of the object for the time interval t = 10 to t = 15 s
Answer:
The answer is below
Explanation:
Given that:
x(t) = at – bt2+c
a) x(t) = at – bt2+c
Substituting a = 1.4 m/s, b = 0.06 m/s2 and c =50 m gives:
x(t) = 1.4t - 0.06t² + 50
At t = 5, x(5) = 1.4(5) - 0.06(5)² + 50 = 55.5 m
At t = 0, x(0) = 1.4(0) - 0.06(0)² + 50 = 50 m
The average velocity (v) is given as:
[tex]v=\frac{x(5)-x(0)}{5-0}\\ \\v=\frac{55.5-50}{5-0}=1.1\\ \\v=1.1\ m/s[/tex]
b) x(t) = 1.4t - 0.06t² + 50
At t = 10, x(10) = 1.4(10) - 0.06(10)² + 50 = 58 m
At t = 0, x(0) = 1.4(0) - 0.06(0)² + 50 = 50 m
The average velocity (v) is given as:
[tex]v=\frac{x(10)-x(0)}{10-0}\\ \\v=\frac{58-50}{10-0}=0.8\\ \\v=0.8\ m/s[/tex]
c) x(t) = 1.4t - 0.06t² + 50
At t = 15, x(5) = 1.4(15) - 0.06(15)² + 50 = 57.5 m
At t = 10, x(10) = 1.4(10) - 0.06(10)² + 50 = 58 m
The average velocity (v) is given as:
[tex]v=\frac{x(15)-x(10)}{15-10}\\ \\v=\frac{57.5-58}{15-10}=0.1\\ \\v=0.1\ m/s[/tex]
a body at rest in one reference frame may be in motion in another reference frame what does it mean?
Answer:
Explanation:
Suppose you are standing on a platform connected to a train station. You appear to be at rest to a third person looking at you from the parking lot.
But what happens if you are observed by someone in the dining car of the train that just passed you?
You appear to be moving. He can prove it because your relative size is getting smaller. How does he know that it is he that is moving and that you are standing still? If he has no idea what's going on with his motion, he also has no idea who is moving.
Two swimmers relax close together on air mattresses in a pool. One swimmer’s mass is 48 kg, and the other’s mass is 55 kg. If the swimmers push away from each other,
A. their total momentum triples.
B. their momentums are equal but opposite.
C. their total momentum doubles.
D. their total momentum decreases.
In the case when the swimmer push away so the momentum should be equal but it should be opposite.
What is momentum?Momentum means the product of the mass of a particle and its velocity. It is a vector quantity, it applied to both magnitude and direction. Since the swimmers are push away so here the momentum should be equal but it should be an inverse direction, not the direct direction.
learn more about momentum here: https://brainly.com/question/24717686
which part of the central nervous system controls reflexes?
a. cerebrum
b. cerebellum
c. brain
d. spinal cord
Answer:
spinal cord becuse it does all of the reflexes
Answer:
none of these
Explanation:
what actually controlls reflexes is the brain stem
