how does the solar minimum that occurred around 2008 compare to those in the previous solar cycles?

Answer:

pushing a box can be both of them because u have to put force into pushing it and also the normal force punches up on the system to support its weight

Answer:

Calculate 'R' of convex mirror and height of the real image

the radius of the convex mirror is 48cm

Explanation:

Distance between convex and concave mirror is =60cm

Radius of the concave mirror (R) = 200cm

For the concave mirror, u = ∞

V = {R}/{2}=100cm

The object for the convex mirror and the final image is on the pole of the concave mirror, and distance between convex and concave mirror is 60cm

u_1=60-100 =-40cm

Object will be behind the convex mirror

1/f=1/40+1/60  

f=24cms

the radius of the convex mirror is 48cm

Explanation:

An object which moves 10 km in 30 minutes .

we have to find the average speed of the object .

Changing unit of time into hour

Time = 30/60 hour

Time = 1/2 hour

Time = 0.5 hour

Now let's calculate the average speed

\( \rm\bf \: Average \: speed \: = \frac{Total \: distance}{Total \: time \: } \)

Put the value we get

\( \dashrightarrow \sf \: Average \: speed \: = \frac{10}{0.5} \\ \\ \dashrightarrow \sf \: Average \: speed \: = \frac{100}{5} \\ \\ \dashrightarrow \sf \: Average \: speed \: = \cancel \frac{100}{5} \\ \\ \dashrightarrow \sf \: Average \: speed \: =20km {hr}^{ - 1} \)

So, the average speed is 20km/hr

Answer:

False

Explanation:

.......................

In workplaces with continuous noise, such as mines, the use of protective gear like ear muffs is encouraged to reduce the amount of noise entering workers' ears. This not only protects their hearing but also helps decrease compensation costs associated with hearing-related injuries.

However, it is important to recognize that these protective gears have limitations. Over time and with extensive use, they can become damaged and less effective at reducing noise exposure. Despite the importance of wearing protective gear, some workers may choose to remove their ear muffs due to discomfort or the desire to hear their colleagues more clearly. This poses a challenge as it increases their risk of being exposed to excessive noise levels, which can lead to hearing damage or loss.

To address this issue, employers should focus on providing comfortable and properly fitting protective gear that minimizes discomfort. Additionally, regular training and awareness programs can emphasize the importance of consistent use of protective gear and educate workers about the potential long-term consequences of noise exposure. Encouraging an open dialogue between workers and management can also help address any concerns or misconceptions related to the use of protective gear.

Ultimately, striking a balance between comfort and safety is crucial. Employers should strive to provide effective and comfortable protective gear, while workers need to understand the importance of consistent usage to safeguard their hearing health in noisy work environments.

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The color of visible light that would have the least energy is red. On the other hand, the color of visible light that would have the most energy is violet.

This is because red light has the longest wavelength and the lowest frequency out of all the colors in the visible spectrum. Violet light has the shortest wavelength and the highest frequency out of all the colors in the visible spectrum.

This relationship between wavelength, frequency, and energy can be explained by the relationship between electromagnetic waves and energy. All electromagnetic waves, including visible light, have a certain amount of energy that is proportional to their frequency. The higher the frequency, the more energy the wave has.

This relationship can also be seen in the electromagnetic spectrum, where higher energy waves (such as X-rays and gamma rays) have shorter wavelengths and higher frequencies, while lower energy waves (such as radio waves) have longer wavelengths and lower frequencies.

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Answer:

The answer is . A 46.2g

Answer:

Explanation:

Take note that when the fuel of the rocket is consumed, the acceleration would be zero. However, at this phase the rocket would still be moving up until all the forces of gravity would dominate and change the direction of the rocket. Hence, there will be a need to calculate two distances, one from the ground until the point where the fuel is consumed and from that point to the point where the gravity would change the direction.

Given:

a = 76.8 m/s^2

t = 1.99 s

Solution:

d = vi (t) + 0.5 (a) (t^2)

d = (0) (1.99) + 0.5 (76.8) (1.99)^2

d = 0+38.4×3.9601

d = 152.068m

vf = vi + at

vf = 0 + 76.8 (1.99)

vf = 152.83 m/s (velocity when the fuel is consumed completely)

Then, we calculate the time it takes until it reaches the maximum height.

vf = vi + at

0 = 152.83+(-9.8) (t)

0 = 152.83 + (-9.8) (t)

-152.83 = -9.8t

t = 152.83/9.8 s

t = 15.59s

Then, the second distance

d= vi (t) + 0.5 (a) (t^2)

d = 152.83 (15.59) + 0.5 (-9.8) (15.59^2)

d = 2382.6197- 1190.93

d = 1191.68m

Then, we determine the maximum altitude:

d1 + d2 = 152.068 m + 1191.68m = 1343.748m

Answer:

a body continues its state of rest or uniform motion in a straight line provided no net force acts on it.

it says that if no net force acts on a body the body will continue its initial state

for example  a chair lying in a room will remain stationary as long as no net force acts on it this is the first part .In second part it says that a body will continue its motion as long as no net force acts on it however this cannot be assumed on earth because if a body starts moving it will come to rest after sometime because of friction and air resistance. T his is only possible in space where there are no resistive forces that can stop the body.

i hope this will be helpful for you.

Answer:

b is the correct answer

Explanation:

Therefore, the tension in the rope is 4 times the weight of the bucket, or 4mg.

Speed is a scalar quantity that measures the rate at which an object covers distance. It is defined as the distance traveled per unit of time. The SI unit of speed is meters per second (m/s), although other units such as kilometers per hour (km/h) and miles per hour (mph) are also commonly used. Speed can be measured using various methods, such as radar, GPS, and speedometers in vehicles. The instantaneous speed of an object at a particular moment in time is called its instantaneous velocity. The average speed of an object over a certain period of time is calculated by dividing the total distance traveled by the object by the total time taken.

Here,

To find the tension in the rope when the bucket has an upward constant acceleration of magnitude 3 m/s², we can use Newton's second law of motion, which states that the net force acting on an object is equal to its mass times its acceleration:

Fₙ = ma

where Fₙ is the net force, m is the mass of the object, and a is the acceleration.

In this case, the bucket is being pulled upward by the tension in the rope, and its weight is pulling it downward. Since the bucket is accelerating upward, the tension in the rope must be greater than the weight of the bucket. Therefore, we can write:

Fₙ = T - mg

where T is the tension in the rope, m is the mass of the bucket, and g is the acceleration due to gravity (9.81 m/s²).

The net force is equal to the mass times the upward acceleration, so we have:

Fₙ = ma

= m(3 m/s²)

= 3m

Setting these two expressions for Fₙ equal to each other, we can solve for the tension in the rope:

T - mg = 3m

T = 4mg

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A car has a maximum acceleration of 3.0 m/s2. Its maximum acceleration, while towing a second car which is twice its mass is 0.11\(ms^{2}\)

According to Newton's second law of motion,

F = ma, i.e Force on a body is equal to the product of the mass of the body multiple by its acceleration

Let us assume the mass of the car be "m"

Force applied by the engine of the car = \(\frac{m}{3}\)

Now, as the car is towing another car, twice its mass which means that the total mass the engine has to pull is m+2m = 3m

As the force applied by the engine is Equal to \(\frac{m}{3}\)

=> F = ma

=> Acceleration = \(\frac{Force}{Total mass}\)

=> Acceleration = \(\frac{\frac{m}{3} }{3m}\) = \(\frac{1}{9} ms^{2}\)

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Answer:

I don't know...

I'm sorry

Answer:

The maximum height reached by the ball is 2.84 m

Explanation:

Given;

initial velocity of the soccer, u = 13 m/s

angle of projection, θ = 35°

The maximum height reached by the ball = ?

Apply the following kinematic equation, to determine the maximum height reached by the ball.

Maximum height (H) is given as;

\(H = \frac{U^2sin^2\theta}{2g} \\\\H = \frac{(13)^2(sin \ 35^0)^2}{2*9.8}\\\\H = 2.84 \ m\)

Therefore, the maximum height reached by the ball is 2.84 m

According to the thrust force, the acceleration is 0.001 m/s².

We need to know about force to solve this problem. According to second Newton's Law, the force applied to an object will be proportional to mass and acceleration. Hence, it can be written as

F = m . a

where F is force, m is mass and a is acceleration

From the question above, we know that

F = 1 N

m = 1000 kg

By substituting the given parameters, we can calculate the acceleration

F = m . a

1 = 1000 . a

a = 1/1000 m/s²

a = 0.001 m/s²

Hence, the acceleration is 0.001 m/s².

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Answer:

The right answer is c because when we heat solid object the molecule will start lose attraction on object

Explanation:

brain list

2mv is the magnitude of the impulse delivered by the wall to the ball.

What is Velocity ?

Velocity is a vector quantity that describes the rate of change of an object's position. It is equal to the displacement of an object divided by the time interval over which the displacement occurred. Velocity has both magnitude and direction, and its units are typically meters per second (m/s). The velocity of an object can change over time due to acceleration, and if an object is moving in a circular path, it also has a component of velocity perpendicular to its direction of motion, known as centripetal velocity.

Impulse = change in momentum

J = m(v - u)

  = m(v-(-v))

J = 2mv

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Answer:

Free-body diagrams are defined as the diagram that represents the direction and magnitude of all forces that act on an object.

There are some limitations of the free-body diagrams, that are:

Answer:

It is important to be extra careful at night and in periods of low visibility from sunset to sunrise and to focus on operating the aircraft safely when the aircraft is moving. Ensure checklist are run through and avoid non essential communications prior to the aircraft being stopped and the breaks are set

Explanation:

According to aircraft rules and regulation, the position lights of an aircraft are required to be switched on on an aircraft which is either operated on the surface and during flight from sunset to sunrise or when the elevation of the Sun below the horizon is more than 6°

However, the anti collision lights are not required to be lighted during night operations, unless the pilot in command specifies it for safety reasons

Answer:

D.

Explanation:

Answer:

Explanation:

trye

answer..

if this is a true or false question it is true

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Answer:

Explanation:

When dealing with optics, there is an incident wave, a reflected wave, and a transmitted wave. An incident wave is the initial wave coming out from the source, like a flashlight.

Then the reflected wave is created when the incident wave encounters an interface like a piece of glass. The reflected wave will reflect like you would expect.

Then, the transmitted wave is the wave which passes through the interface and continues.

So, a good question would be to ask for the value of the reflected wave function given an initial incident wave.

Another example entirely would be to look at the reflected wave on a tensioned string. If you shake a string up and down, a wave will be sent through it. Once hitting the wall, the wave will reflect back. A good question there is asking how the amplitude of the wave changed.

Two boys of masses 45kg and 60kg sit facing one another on light frictionless trolleys holding the ends of a strong taut cord between them. The lighter boy tugs the cord and acquires a velocity of 2m/s. The initial velocity of the other boy is -1.5m/s. Their motion when they collide will either both come to a stop or move together at the same velocity.

The initial velocity of the other boy can be found using the principle of conservation of momentum.

Momentum before the tug = Momentum after the tug

(45kg)(0) + (60kg)(0) = (45kg)(2m/s) + (60kg)(v)

0 = 90kg*m/s + 60kg*v

60kg*v = -90kg*m/s

v = -90kg*m/s / 60kg

v = -1.5m/s

The initial velocity of the other boy is -1.5m/s.

When the two boys collide, their motion will be affected by the principle of conservation of momentum. The total momentum before the collision will equal the total momentum after the collision. Since the two boys have equal and opposite momenta before the collision, their total momentum is zero. After the collision, their total momentum will still be zero, meaning that they will either both come to a stop or move together at the same velocity. The exact outcome will depend on the specifics of the collision, such as whether it is elastic or inelastic.

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Answer:tension, density, temperature and elasticity

Explanation:

Answer:

Asteroid 1 has more mass than asteroid 2

Explanation:

User avatar

thenoobygamerpro

01/25/2020

Physics

Middle School

answered

Asteroid 1 moving 8km/s right asteroid 2 moving 16 km/s left before the crash. After the crash asteroid 1 is moving 4 km/s left and changed speed bu 12km/s. Asteroid 2 moving 2km/s left and changed speed by 14km/s

Two asteroids crashed. The crashed caused both asteroids to change speed. Scientist want to use the change in speed and motion to figure out which asteroid has more mass. Based on the information in the diagram. which statement is correct? In your answer explain what the forces were like and why the asteroids changed motions

Asteroid 1 has more mass than asteroid 2

Asteroid 1 and asteroid 2 are the same mass

Or asteroid 1 has lees mass than asteroid 2

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Answer: Asteroid 1 has more mass than asteroid 2

Explanation:

We can use the conservation of momentum law to find the answer. So, according to this law:

"If two objects or bodies are in a closed system and both collide, the total momentum of these two objects before the collision will be the same as the total momentum of these same two objects after the collision".

This means the momentum before the collision or crash () is equal to the momentum after the collision ():

(1)

Before the crash:

(2)

Where:

is the mass of the first asteroid

is the velocity of the first asteroid

is the mass of the second asteroid

is the velocity of the second asteroid

(3)

After the crash:

(4)

Where:

is the final velocity of the first asteroid

is the final velocity of the second asteroid

(5)

Substituting (3) and (5) in (1):

(6)

Grouping similar terms:

(7)

Then:

(8) This means  must be multiplied by 1.16 km/s in order to make this side of the equation equal to .

Respuesta: T2 = 131.04K

Explicación: Dado lo siguiente:

Presión, P1 = 1.5 atm = 1.5 × 760 = 1140 mmHg

Presión, P2 = 1.2 atm = 1.2 × 760 = 912 mmHg

Volumen, V1 = 500cm3 Volumen, V2 = 300cm3

Temperatura, T1 = 273K Temperatura, T2 =?

Usando la fórmula de gas combinada:

P1V1 / T1 = P2V2 / T2

Ingresando nuestros valores:

(1140 × 500) / 273 = (912 × 300) / T2

T2 × (1140 × 500) = 912 × 300 × 273

T2 = 74692800/570000 T2 = 131.04K

Answer:

4.489 m/s

Explanation:

We are given;

Length of rod;L = 51.4 cm = 0.514 m

When the ball is at the top end, it's velocity will be zero and it's kinetic energy will be transformed to potential energy.

Thus; ½mv² = mgh

m will cancel out to give;

v² = 2gh

Where:

g is acceleration due to gravity = 9.8 m/s²

h is the maximum height of the ball which is equal to twice the length of the rod.

Thus, h = 2(0.514) = 1.028 m

v² = 2 × 9.8 × 1.028

v = √20.1488

v = 4.489 m/s