Explanation:
r madhava I have a great time lagega ki deri na koira amar in the the
12. A rocket, initially at rest on the ground, accelerates vertically. It accelerates uniformly until it
reaches a speed of 900 m/s after 30 s. After this period of uniform acceleration, the rocket
engine cuts out. During the next 90 s, the upward speed of the rocket decreases uniformly to
zero.
speed
m/s
times
plot a speed-time graph for the rocket for the first 120 s of it's flight
Answer:
We kindly invite you to read carefully the explanation and check the image attached below.
Explanation:
According to this problem, the rocket is accelerated uniformly due to thrust during 30 seconds and after that is decelerated due to gravity. The velocity as function of initial velocity, acceleration and time is:
[tex]v_{f} = v_{o}+a\cdot (t-t_{o})[/tex] (1)
Where:
[tex]v_{o}[/tex] - Initial velocity, measured in meters per second.
[tex]v_{f}[/tex] - Final velocity, measured in meters per second.
[tex]a[/tex] - Acceleration, measured in meters per square second.
[tex]t_{o}[/tex] - Initial time, measured in seconds.
[tex]t[/tex] - Final time, measured in seconds.
Now we obtain the kinematic equations for thrust and free fall stages:
Thrust ([tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]a = 30\,\frac{m}{s^{2}}[/tex], [tex]t_{o} = 0\,s[/tex], [tex]0\,s\le t< 30\,s[/tex])
[tex]v = 30\cdot t[/tex] (2)
Free fall ([tex]v_{o} = 900\,\frac{m}{s}[/tex], [tex]a = -9.807\,\frac{m}{s}[/tex], [tex]t_{o} = 30\,s[/tex], [tex]30\,s \le t \le 120\,s[/tex])
[tex]v = 900-9.81\cdot (t-30)[/tex] (3)
Now we created the graph speed-time, which can be seen below.
a 0.3 kg arrow is fired from a bow with a kinetic energy of 82.0 J. what is its velocity?
Answer:
When the string of a bow and arrow is pulled from equilibrium, the elastic potential energy in the bow is converted to kinetic energy of the arrow when the string is released.
Kinetic energy of an arrow can be found by using the formula KE=(mv²)/450,240 where m = mass of the arrow in grains and v = velocity of the arrow in fps.
Two factors determine the amount of energy a bow can hold. Its draw weight is the amount of force required to draw the bow. A bow's draw weight increases the farther back you pull the string.
Does a stretched bow and arrow have energy?
An arrow held in a stretched bow also contains this stored energy. Specifically, the bow has elastic potential energy. When the bow is released, the arrow will move. ... When work is done on an object, the work may be converted into either kinetic or potential energy.
Explanation:
A planet's distance from the sun is 2.0x10^11 m. what is the orbital period?
Answer:
The square of the orbital period of a planet is directly proportional to the cube of the semimajor axis of its orbit.
Explanation:
hope this helps.
ANYONE HELP ME PLEASE!
kinetic energy and potential energy are often considered to be forms of mechanical energy. list three other forms of energy and state a source for each.
Answer:
Kinetic energy is the energy in moving objects or mass. Examples include mechanical energy , electrical energy etc.
1. What is the weight of a 12 kg dog on the moon? (acceleration of gravity is 1.63 m/s2)
21. For this table of data, how should the y-axis be labeled (with units)?
force applied (N)
2.5
3.2
4.8
5.4
5.5
6.3
7.6
8.2
displacement (m)
10.75
13.76
20.64
23.22
23.65
27.09
32.00
35.26
O displacement
Om
O force applied
O force applied (N)
O displacement (m)
ON
Answer:
The y-axis would be labeled with displacement (m)
Explanation:
The displacement is dependent on the force applied.
Labels should have what you measure and how your units of measure.
The x-axis would be labeleed with force applied (N)
The y-axis would be labeled with displacement (m)
Which is the distance of the satellite from Earth?
1,500,000 m
2,240,000 m
9,608,000 m
16,008,000 m
the distance of satellite from earth is 2,240,000 m
Answer:
b on E2020
Explanation:
wo ships, one 200200 metres in length and the other 100100 metres in length, travel at constant but different speeds. When travelling in opposite directions, it takes 1010 seconds for them to completely pass each other. When travelling in the same direction, it takes 2525 seconds for them to completely pass each other. The speed of the faster ship, in metres per second, is
Answer:
The speed of the faster ship is 22.5 m/s
Explanation:
The length of the ships are;
Ship 1 = 200 m
Ship 2 = 100 m
The time it takes for the ships to completely cross each other when travelling in opposite directions = 10 seconds
The time it takes both ships to cross each other when travelling in the same direction = 25 seconds
Let x represent the speed of the first ship, ship 1, and y represent the speed of the second ship, ship, 2, we have;
(x + y) × 10 = 200 + 100 = 300
10·x + 10·y = 300...(1)
(x - y) × 20 = 200 + 100 = 300
20·x - 20·y = 300...(2)
Multiply equation (1) by 2, to get;
(x + y) × 10 × 2 = 300 × 2
20·x + 20·y = 600...(3)
Adding equation (1) to equation (3) gives;
20·x + 20·y + 20·x - 20·y = 600 + 300
40·x = 900
x = 900/40 = 22.5
x = 22.5
The speed of the first ship, ship 1 = x = 22.5 m/s
From equation (1), we have;
10·x + 10·y = 300
y = (300 - 10·x)/10 = (300 - 10×22.5)/10 = 7.5
y = 7.5
The speed of the second ship, ship 2 = y = 7.5 m/s
Therefore, the faster ship is ship 1 with a speed of 22.5 m/s
Which two quantities can be expressed using the same units?
1.energy and force
2.work and force
3.work and energy
4.power and work
What is the difference between precision and accuracy of measurement.
Answer:
Precision: closeness of your measurements to each other
Accuracy: closeness of your measurements to a specific value
Hope this helps
Explanation:
Wil-E-Coyote drops a bowling ball off a cliff to try to catch the Roadrunner. The cliff is 132m high. how far does it fall in the first 3.0 seconds
Ans
2075 Set B Q.No. 90 A water reservoir fank of capacity
is situated at a height of 20 m from the water level. W
be the power of an electric motor to be used to fill the
3 hours? Efficiency of motor is 70%.
In which direction does the sun appear to move across the sky
Answer:east
Explanation:Earth rotates or spins toward the east, and that's why the Sun, Moon, planets, and stars all rise in the east and make their way westward across the sky.
Answer:
it rises east and moves west through out the day and sets west
HELP!!!! PLEASE (and there will be more)
Which type of wave does the illustration depict?
longitudinal wave
surface wave
transverse wave
Answer:
i wanna say tranverse if not surface
Explanation:
Answer : Surface Wave
Explanation:
Gravity waves along the surface of liquids, such as ocean waves. (btw it does look like ocean waves)
Why pendulum made of invar are used in clock?
Beacuse it is an alloy that is made up of nickel and iron that has low coefficient of thermal expansion.So, the length of the pendulum remains unaffected during changes in temperature.
A 25 kg rock falls for 1.7 seconds. How many meters tall
was the building?
Description:
So if a 25 kg rock is falling 1.7 seconds.
2.7 + 1/2 9.8 m/s² 2.7 s)
= 35.72m²
Equations:
v = 0 m/s
a = 9.8 m/s²
t = 2.7
Answer: 35.72 m
Hope this helps.
How can you warm up for baseball?
calculate the kinetic energy of a Toyota Camry car traveling with a velocity of 40 m/s and has a mass of 1120 kg
Answer:
896,000 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 1120 \times {40}^{2} \\ = 560 \times 1600[/tex]
We have the final answer as
896,000 JHope this helps you
15 POINTS PLZ HELP
please look at the images below
Answer:
A incresing speading up
Explanation:
Which type of modulation is used by remote-control toys?
-amplitude
-frequency
-phase
-pulse
Answer:
Explanation:
Experts in this field report that the modulation is FM or frequency modulation. There are exceptions, but they were not listed.
The usual frequencies allocated to these toys is 27 MHz and 72 Mhz.
There is not much chance of interference because the range is small even with a good transmitter.
Answer:
pulse
Explanation:
What is the latent heat of vaporization for water
When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization. The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol. The vaporization is the opposite process of condensation.
hope this helped <3
What is the name of a process when two parents is needed to create offspring
Btw I feel like I won't use Brainly anymore
Answer:
Sexual reproduction
Explanation:
Its what its called hope it helps
Answer:
i think its called allogamy
Explanation:
what is the speed of light at 15°c
Answer:
calculation presented a speed of 125,000 miles per second (200,000 km/s).
Explanation:
Your boss at the Cut-Rate Cuckoo Clock Company asks you whatwould happen to the frequency of the angular SHM of the balancewheel if it had the same density and the same coil spring (thus thesame torsion constant), but all the balance wheel dimensions weremade one-third as great to save material.
a)By what factor would the frequency change?
b)Would the frequency increase or decrease by the factor foundin part (a)?
c)By what factor would the torsion constant need to be changedto make the smaller balance wheel oscillate at the originalfrequency?
d)Would the torsion constant need to be increased or decreasedby the factor found in part (c)?
Answer:
a) the factor between the frequencies is f ’/ f₀ = 9
b) the frequency increases f ’= 9 f₀
c) So that the frequency is equal to the initial one k ’= k₀ / 81
d) the torque constant must decrease
Explanation:
This is a simple harmonic motion, like angular velocity
w = [tex]\sqrt{\frac{k}{I} }[/tex]
where k is the torsion constant and I the moment of inertia of the flywheel.
Angular velocity and frequency are related
w = 2π f
we substitute
[tex]f= \frac{1}{2\pi } \sqrt{\frac{k}{I} }[/tex] (1)
We will use the subscript o for the system without change
f = [tex]\frac{1}{2\pi }[/tex] [tex]\sqrt{\frac{k}{I_{o} } }[/tex]
In the problem they indicate that the torsion constant remains constant, therefore we must analyze the moment of inertia, in general the flywheels are circular discs,
I = ½ M R²
Let's find the change when reducing the radius r ’= r / 3
Let's use the density
ρ = m ’/ V’
m ’= ρ V’
disk volume is
V = π r² e
suppose that the thickness is small and does not change, substitute
m ’= ρ π[tex](\frac{r}{3}) ^{2}[/tex] e = 1/9 m
Moment of inertia
I ’= ½ m’ r’²
I ’=[tex]\frac{1}{2}[/tex] [tex]\frac{1}{9}[/tex] m (\frac{r}{3}) ^{2} = 1/81 (½ m r²)
I ’= 1/81 Io
we substitute in equation 1
f ’= [tex]\frac{1}{2\pi }[/tex] \sqrt{\frac{k}{I} }
f ’= \frac{1}{2\pi } \sqrt{\frac{81k}{Io} }
f ’= 9 f₀
Let's analyze the questions
a) the factor between the frequencies is
f ’/ f₀ = 9
b) the frequency increases
f ’= 9 f₀
c) So that the frequency is equal to the initial one
k ’= k₀ / 81
d) the torque constant must decrease
what is a quantity such as mass, length, or speed which is completely specified by its magnitude and not direction called?
Answer:
Scalar quantity
Explanation:
Scalar quantities are measurements that consist of only a magnitude which is measured in numbers only. For example speed is a magnitude because it measures how fast something is going.
Vector quantities are measurements that include a magnitude and direction which means there is a number measurement and a direction associated with that measurement. For example, velocity is a vector quantity because there is a measurement of speed, and it also includes the direction of the speed.
Why do you need a driver’s license to buy alcohol when you can’t drink and drive?
Answer:
Because when people under the age of 21 try to buy alcohol, they need to be verified by their state that they are that age. So if they are under legal age, 21, the store isn't allowed to give them the Alcoholic beverage.
Explanation:
An object is thrown into the air at 60m/s, straight up. What is its velocity at the highest point?
Explanation:
Whenever an object is at its highest point, the velocity and acceleration of the object is zero.
3- Our stomachs contain hydrochloric acid (pH 1.5-3.5). Why do you suppose this
helps our bodies? How does the stomach lining avoid what happened to the milk?
4. Explain how a buffer can helps maintain a stable internal environment.
(homeostasis)
Answer:
i hardly havent got teach this sorry
An object is accelerating at 15 m/s^2 with a mass of 4 kg on it. What is the resulting force on this object?
Answer:
60 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 4 × 15
We have the final answer as
60 NHope this helps you
A rock weighing 20 N (mass = 2 kg) is swung in a horizontal circle of radius 2 m at a constant speed of 6 m/s. What is the centripetal force acting on the rock?
A. 18 N
B. 360 N
C. 36 N
D. 180 N
Answer:
what do u need help with
Explanation:
B. 360 N
