Answer:
(a) t = 5.66 s
(b) t = 8 s
Explanation:
(a)
Here we will use 2nd equation of motion for angular motion:
θ = ωi t + (1/2)∝t²
where,
θ = Angular Displacement = (3.7 rev)(2π rad/1 rev) = 23.25 rad
ωi = initial angular speed = 0 rad/s
t = time = ?
∝ = angular acceleration = 1.45 rad/s²
Therefore,
23.25 rad = (0 rad/s)(t) + (1/2)(1.45 rad/s²)t²
t² = (23.25 rad)(2)/(1.45 rad/s²)
t = √(32.06 s²)
t = 5.66 s
(b)For next 3.7 rev
θ = ωi t + (1/2)∝t²
where,
θ = Angular Displacement = (3.7 rev + 3.7 rev)(2π rad/1 rev) = 46.5 rad
ωi = initial angular speed = 0 rad/s
t = time = ?
∝ = angular acceleration = 1.45 rad/s²
Therefore,
46.5 rad = (0 rad/s)(t) + (1/2)(1.45 rad/s²)t²
t² = (46.5 rad)(2)/(1.45 rad/s²)
t = √(64.13 s²)
t = 8 s
The time taken in each case is 2.55 s
Let us recall that the equations of circular motion are almost like those of linear motion;
α = ω2 - ω1/t
α = angular acceleration
ω2 = final angular velocity
ω1 = initial angular velocity
t = time taken
a) 1.45 rad/s2 =3.70 rev/s - 0 rev/s/t
t = 3.70 rev/s/1.45 rad/s2
t = 2.55 s
b) For, ) the next 3.70 rev:
1.45 rad/s2 =3.70 rev/s - 0 rev/s/t
t = 3.70 rev/s/1.45 rad/s2
t = 2.55 s
Learn more about angular velocity; https://brainly.com/question/1301963
what is da answer please i need help
Answer:
Air and water i think
Explanation:
Cause Air =25% and water=25% so that equals 50%
give a strong idea to protect , purify and the beautify of the Dal lake
Answer:
Water in dal lake is test for any heavy metals and pollutant, sewage and drainage system are also monitored for the same.
Explanation:
Dal lake is located in Srinagar that is the state capital of Kashmir and is known for recreation and tourism purposes. The area covers about 18 km sq. and forms a part of natural wetlands. The lake is prone to pollution and has recently undergone restoration measures. To address the problems of eutrophication algae and large-scale microplankton have been removed from the water. The government of India has taken various measures to check the pollution by setting up a committee to monitor the proper use of allotted funds.
What is responsible for keeping an object at rest or maintaining an object's
constant velocity?
Answer:
Inertia
Explanation:
Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity.
How does simple machines make work easier?
The simple machines can help make work easier by working quicker than the people and making other peoples jobs easier.
Explanation:
I hope this helped.
The Sputnik 1 satellite orbited Earth
(mass = 5.98 x 1024 kg) in a circle of
radius 6.96 x 106 m. What was its
period of orbit in seconds?
[?] s
Answer:
5778.1931
Explanation:
Given that:
Mass (M) = 5.98 x 10^24 kg
Radius (r) = 6.96 x 10^6 m
Gravitational constant (G) = 6.67 * 10^-11
Using the relation:
T² / R³ = 4π² / GM
Where T = period of orbit
T = 2π√(R³ /GM)
T = 2π√((6.96 x 10^6)³) /(6.67 * 10^-11) * (5.98 x 10^24)
T = 2π√((3.37153 * 10^20) / (39.866 * 10^13))
T = 2π √845715.64
T = 2π * 919.62799
T = 5778.1931
When a red giant star begins to burn helium, it
the outer shell of the star are blown off with big clouds of gas and dust which is know as a nebula
The diagrams below show forces acting on a toy car as it moves to the right which diagram shows the toy car that will most likely accelerate to the right based on these conditions?
Answer:
Option 1.
Explanation:
To know which option is correct, let us calculate the net force in each case to know which will move to the right direction.
Option 1:
Force to the right (Fᵣ) = 8 N
Force to the left (Fₗ) = 6 N
Net force (Fₙ) =?
Fₙ = Fᵣ – Fₗ
Fₙ = 8 – 6
Fₙ = 2 N to the right
Option 2:
Force to the right (Fᵣ) = 8 N
Force to the left (Fₗ) = 10 N
Net force (Fₙ) =?
Fₙ = Fₗ – Fᵣ
Fₙ = 10 – 8
Fₙ = 2 N to the left
Option 3:
Force to the right (Fᵣ) = 10 N
Force to the left (Fₗ) = 10 N
Net force (Fₙ) =?
Fₙ = Fᵣ – Fₗ
Fₙ = 10 – 10
Fₙ = 0 (no movement)
Option 4:
Force to the right (Fᵣ) = 10 N
Force to the left (Fₗ) = 13 N
Net force (Fₙ) =?
Fₙ = Fₗ – Fᵣ
Fₙ = 13 – 10
Fₙ = 3 N to the left
From the illustrations made above, only option 1 has a net force toward the right direction. Therefore, only option 1 will have an acceleration towards the right direction.
Answer:
Option 1
Explanation:
Write 3 paragraphs explaining conduction, convection, and radiation. The paragraph must include examples of each and explain the type of energy. It also must include conductors and insulators and various examples of each.
Answer:
Eeeeeeeeeeeeeeeeeeeeeeeeeee
If we increase the driving frequency in a circuit with purely resistive load, how do the amplitudes VR and IR change?
Answer:
V = I R
expression does not depend on the frequency, so when changing this quantity does not change the voltage or the current in the circuit.
Explanation:
In a purely resistive circuit, the Ohm relation, m for which
V = I R
We see that the previous expression does not depend on the frequency, so when changing this quantity does not change the voltage or the current in the circuit.
This does not happen in circuits with capacitors or inductors where there is an explicit dependence on frequency.
Betelgeuse - the right shoulder star of Orion - is a red giant star. Its radiation peaks in the infrared at λ = 800 nm. What is the surface temperature of the star?
Answer:
3622.5 K
Explanation:
The radiation of red giant star is 800nm.
We need to find the surface temperature of the star. Let it is T.
Using Wein's displacement law to find it as follows :
[tex]\lambda=\dfrac{C}{T}[/tex]
C is constant an T is temperature
[tex]T=\dfrac{C}{\lambda}\\\\T=\dfrac{2.898\times 10^{-3}}{800\times 10^{-9}}\\\\ T=3622.5\ K[/tex]
So, the surface temperature of the star is 3622.5 K.
What is the kinetic energy of a 4-kg toy car moving at a velocity of 8 m/s?
O 32J
64 J
O
128 J
256 J
Answer:
128 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 4 \times {8}^{2} \\ = 2 \times 64[/tex]
We have the final answer as
128 JHope this helps you
Mass of toy the car = 4 kg
Velocity of toy the car = 8 m/s
Kinetic energy of an object is the energy that it possesses due to its motion.
Kinetic energy is directly proportional to the mass of the object and to the square of its velocity.
Formula of Kinetic energy:
[tex] \boxed{ \bf{KE = \dfrac{1}{2}mv^2}}[/tex]
KE → Kinetic energy of the Object (J)
m → Mass of the Object (kg)
v → Speed of the Object (m/s)
By substituting values in the formula, we get:
[tex] \rm \longrightarrow KE = \dfrac{1}{2} \times 4 \times 8^2 \\ \\ \rm \longrightarrow KE = \dfrac{1}{2} \times 4 \times 64\\ \\ \rm \longrightarrow KE = 2 \times 64 \\ \\ \rm \longrightarrow KE = 128 \: J[/tex]
[tex] \therefore [/tex] Kinetic energy of the toy car = 128 J
(60 points pls help thx)a worksheet on calculating speed
Nicki rides her bike at a constant speed for 6 km. That part of her ride takes her 1 h. She then rides her bike at a constant speed for another
km. That part of her trip takes her 2 h. What is her average speed?
Answer:
Nicki's Average Speed is 6 km
Explanation:
If Nicki rides her bike at a constant speed for 1 hour, that means that Nicki will stay at a constant rate for another 2 hours.
Thus your answer: 6 km
N stands for _____________________, which is an SI unit of force.
Answer:
Newton
Explanation:
A 1100 kg sports car accelerates from 0m/s to 32m/s in 10 seconds. What is the average power of the engine?
Answer:
The average power of the engine of the sports car is 56.32 kW
Explanation:
Given;
mass of the sports car, m = 1100 kg
initial velocity of the sports car, u = 0 m/s
final velocity of the sports car, v = 32 m/s
time of motion, t = 10 s
The kinetic energy of the car is given by;
K.E = ¹/₂m(v² - u²)
K.E = ¹/₂mv²
K.E = ¹/₂ x 1100 x 32²
K.E = 563200 J
The average power of the engine of the sports car is given by;
Pavg = Energy / time
Pavg = 563200 / 10
Pavg = 56320 W
Pavg = 56.32 kW
Therefore, the average power of the engine of the sports car is 56.32 kW
Help please an observer at the North Pole sees the moon phase shown below. What Moon phase will be observed approximately one week later?
Answer:
it should be a new moon
Explanation:
A book on a 2-meter high shelf has a mass of 0.4 kg. What is its potential energy?
Answer:
[tex]\boxed {\boxed {\sf 7.84 \ Joules}}[/tex]
Explanation:
The formula for potential energy is:
[tex]PE=m*g*h[/tex]
where m is the mass, g is the gravitational acceleration, and h is the height.
The mass of the book is 0.4 kilograms. The gravitational acceleration on Earth is 9.8 m/s². The height of the book is 2 meters.
[tex]m=0.4 \ kg \\g=9.8 \ m/s^2 \\h=2\ m[/tex]
Substitute the values into the formula.
[tex]PE=(0.4 \ kg)(9.8 \ m/s^2)(2 \ m)[/tex]
Multiply the first two numbers.
0.4 kg*9.8 m/s²= 3.92 kg*m/s²If we convert the units now, the problem will be much easier later on. 1 kg*m/s² is equal to 1 Newton. So, our answer of 3.92 kg*m/s² is equal to 3.92 N[tex]PE=(3.92 \ N )(2 \ m)[/tex]
Multiply.
3.92 N* 2 m=7.84 N*m1 Newton meter is equal to 1 Joule (this is why we converted the units). Our answer is equal to 7.84 Joules.[tex]PE=7.84 \ J[/tex]
Answer:
7.84 is your answer ok bye
A 1235 kg whale swims horizontally at a speed of 6.4 m/s. It suddenly collides directly with a stationary seal of mass 189 kg. The seal grabs onto the whale and holds fast. What is the speed of these two sea creatures just after their collision?
Answer:
The speed of these two sea creatures just after their collision is 5.55 m/s.
Explanation:
Given;
mass of the whale, m₁ = 1235 kg
initial speed of the whale, u₁ = 6.4 m/s
mass of the seal, m₂ = 189 kg
initial speed of the seal, u₂ = 0
let their final speed after collision, = v
Apply the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
(1235 x 6.4) + (189 x 0) = v(1235 + 189)
7904 = 1424v
v = 7904 / 1424
v = 5.55 m/s
Therefore, the speed of these two sea creatures just after their collision is 5.55 m/s.
the nitrogen group has 5 electrons true or false
Answer:
True
Nitrogen family elements consists of atoms having 5 electrons in their outer energy level.
Please mark me the brainliest
Hope it may helps you
How much heat does 56 L of water need to absorb to raise its temperature from 350C to 740C?
Answer:
300 L of water
Explanation:
3. A car travels at 30mph for 2hours and then 40mph
for 3hours in the same direction. What is the average
speed of the vehicle's entire trip?
Answer:
1. 60/90
2.67/63
Explanation:
A body can have zero average velocity but not zero average speed. Why?
When Royce was 10 years old, he had a mass of
30 kg. By the time he was 16 years old, his mass
increased to 60 kg. How much larger is the
gravitational force between Royce and Earth at
age 16 compared to age 10?
Answer:
The gravitational force between Royce and Earth would be doubled at 16 years.
Explanation:
"Newton's law of universal gravitation states that gravitation force between two masses is proportional to the magnitude of their masses and inverse-squared of their distance".
Royce Scenario
At the age of 10 Royce's mass = 30kg
At the age of 16 Royce's mass = 60kg
From Newton's law of universal gravitation, an Increase in the mass of a body would amount to a corresponding increase in the gravitational force.
In the case of Royce, the mass double between the age of 10 and 16, so there would be an increase of the gravitation force by double.
The gravitational force at the age of 60 is doubled of the gravitational force at the age of 10. A complete solution is below.
Given:
At 10 years old,
Mass,
m = 30 kgnow,
→ [tex]Gravitational \ force (F_1) = \frac{GMm}{r^2}[/tex]
[tex]= mg[/tex]
or,
→ [tex]g = \frac{GM}{r^2}[/tex]
then,
Gravitational force = 30 g
Now,
At 16 years old,
Mass,
m = 60 kgNow,
→ [tex]\frac{F_1}{F_2} = \frac{30}{60}[/tex]
[tex]=\frac{1}{2}[/tex]
[tex]F_2 = 2F_1[/tex]
Thus the above response is right.
Learn more:
https://brainly.com/question/22416758
(3x104 kg) (4 x 104 m)
6 x 104 s
Answer:
77852x∧100 kgms
Explanation:
What is the minimum energy (in MeV) that is required to break a nucleus of 12C (of mass 11.99671 u) into three nuclei of 4He (of mass 4.00151 u each)?
Answer:
the minimum energy that needed to break the nucleus is 1.12608 × 10^-12 J
Explanation:
The computation of the minimum energy that needed to break the nucleus is shown below:
The Change in mass is
= 11.99671 - 3 × 4.00151
= 0.00782
The Energy = mc^2
= (0.00782 × 1.6 × 10^{-27}) × (3 × 10^8)^2
= 1.12608 × 10^-12 J
Hence, the minimum energy that needed to break the nucleus is 1.12608 × 10^-12 J
The same is to be considered
HURRY
An ultrasound tech is trying to identify an object, but the screen of the machine is broken. Which statement best describes this situation?
The generated sound wave will not be able to reflect off of the object.
The sound wave will not be generated, so there will be no echoes received.
The echoes will be made but will not be able to be received by the machine.
The machine will not be able to process the received echoes into images.
Answer:
It’s b
Explanation:
Everyone else is wrong and I tried this and got it right
Answer:
the answer is b or "The sound wave will not be generated, so there will be no echoes received."
Explanation:
ok who love lizard can we talk plz
Answer:
Meeee
Explanation:
A projectile is fired horizontally from a height of 78.4 m at a speed of 300 m/sec. How far did it travel horizontally before hitting the ground?
Answer:
Explanation:
Using the formula for calculating range expressed as;
R = U√2H/g
U is the speed = 300m/s
H is the maximum height = 78.4m
g is the acceleration due to gravity = 9.8m/s²
Substitute into the fromula;
R = 300√2(78.4)/9.8
R = 300 √(16)
R = 300*4
R = 1200m
Hence the projectile travelled 1200m before hitting the ground
A proton moves at a speed of 850 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.70 T. What is the magnitude of the magnetic force on the proton?
Answer:
The magnitude of the magnetic force on the proton is 9.532 x 10⁻¹⁷ N
Explanation:
Given;
speed of proton, v = 850 m/s
magnitude of magnetic field, B = 0.7 T
Charge of proton, q = 1.602 x 10⁻¹⁹ C
The magnitude of the magnetic force on the proton;
F = qvB
F = ( 1.602 x 10⁻¹⁹)(850)(0.7)
F = 9.532 x 10⁻¹⁷ N.
Therefore, the magnitude of the magnetic force on the proton is 9.532 x 10⁻¹⁷ N
HELLPPPP PLZZZ
10. Identify Which gas law
does this graph represent.
