Which vector is the sum of vectors a and ?
b
а
O
A.
B.
C.

Answer:

The centripetal acceleration of a point on the outer tip of a blade is 1.097 m/s²

Explanation:

Given;

length of the fan blade, r = 0.25 m

angular speed = 20 rpm

The angular speed in rad/s is given as;

[tex]\omega = \frac{20 \ rev}{ \ \ \min} \ \times \ \frac{2\pi}{1 \ rev} \ \times \ \frac{1 \ \min}{60s} = 2.095 \ rad/s \\\\[/tex]

The centripetal acceleration of a point on the outer tip of a blade is given as;

[tex]\alpha_c = \frac{v^2}{r} = \omega ^2r[/tex]

[tex]\alpha _c = (2.095)^2(0.25)\\\\\alpha _c =1.097 \ m/s^2[/tex]

Therefore, the centripetal acceleration of a point on the outer tip of a blade is 1.097 m/s²

Answer:

Explanation:

Given

[tex]rpm = 20[/tex]

therefore,

[tex]20rpm = \frac{20*2\pi}{60}\\\\=2.1 rad/s = w[/tex]

From,

[tex]V = rw\\\\V = 0.25 * 2.1\\\\V = 0.525m/s[/tex]

Centripetal acceleration,

[tex]a_c = \frac{V^2}{r}\\\\a_c = \frac{0.525^2}{0.25}\\\\a_c = 1.1m/s^2[/tex]

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Answer:

F = 69.5 [N]

Explanation:

We must remember that the friction force is defined as the product of the normal force by the coefficient of friction, and it can be calculated by the following expression.

[tex]f=N*miu[/tex]

where:

N = normal force [N]

miu = friction coefficient

f = friction force = 22 [N]

Now we must calculate the force exerted by means of Newton's second law which tells us that the sum of forces on a body is equal to the product of mass by acceleration.

[tex]F - f = m*a[/tex]

where:

F = force exerted [N]

f = friction force [N]

m = mass = 95 [kg]

a = acceleration = 0.5 [m/s²]

Now replacing:

[tex]F - 22 = 95*0.5\\F = 47.5 + 22\\F = 69.5 [N][/tex]

Answer:

9.70 kilograms

Explanation:

I got a 100% on my test

The mass of the object is 9.7 kg. Option (A) is correct.

Every day, we experience the normal force. For instance, when a book is placed on a table, the usual response force prevents the book from falling through the table, even though gravity is pulling the book downward. That implies that there is a force acting to push it upward. The word "normal force" refers to the force. Normal in this context refers to being perpendicular to the ground.

Given parameters:

the normal force acting on the object is: N =  95.0 newtons.

coefficient of static friction: μ = 0.110.

We have to find mass of the object: m = ?

We know that:

Normal force = weight of the object

⇒ N = mg

⇒ m = N/g = 95.0/9.8 kg = 9.7 kg

Hence, the mass of the object be 9.7 kg.

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Answer:

it should be C.

Explanation:

Visualizing refers to the ability to create mental pictures in our mind based on the text we read or words we hear. When we visualize, we are tapping into our prior knowledge, making connections, gathering information and paying attention to detail. It is one of many skills that make reading comprehension possible.

Answer:

D. Energy in an isolated system remains constant

General Formulas and Concepts:

Physics

Explanation:

According to the Law of Conservation of Energy, it cannot be created or destroyed.

Therefore, we can eliminate choices A and B right off the bat.

We need to choose between C and D. We know that even though energy cannot be created or destroyed, it can be changed into a different form. Therefore, the correct answer is D.

Answer:

They all have electrical currents

Answer:

They have electronic parts and currents

Answer:

Explanation:

From the question, it says that their tent is 11 km away from the shore which is also 3 km away from the coral reef. Essentially, the tent us 11 + 3 km away from the coral reef, and that's 14 km. He has to run at a rate of 7 know to cover an 11 km length and swim at 2 kmph to cover a 3 km length.

All the visitor needs to do is run more than 7 kmph to reduce the days time. For example, running at 11 kmph takes him or her exactly 1 hour to reach the shore, before taking another swim of about an hour to reach the reef

Answer:

10.11

Explanation:

Answer:

198785.714286 Joules

Explanation:

[tex]W=f*d[/tex]

[tex]F=ma\\F=516.326530612*-14\\F=-7228.57142857 N\\[/tex]

To find work:

Now that the force and the distance are known, plug and chug:

[tex]W=f*d\\W=-7228.57142857*27.5\\W=-198785.714286J[/tex]

Note that the question is asking for the magnitude of work, so the negative can be discarded as it is a directional component.

So, your answer is

198785.714286 Joules

Answer:

temperature is the degree or intensity of heat present in a substance or object.

Please mark me as Brainliest ........

Answer:B

Explanation:please like this bc I just did it and got it right

Answer:

I believe its forward or south :D

Explanation:

Answer:

B. False

Explanation:

Without good technique and posture you can end up getting injured.

If Dominic has a brain injury, then he must have sustained a serious injury.

The brain coordinates all the activities in the body such as speech, locomotion, coordination and intelligence. This makes the brain the master point of control in the body.

Whenever there is an injury to the brain, various parts of the body could be affected. Functions such as speech, locomotion and general coordination may become largely impaired.

Therefore, if Dominic has a brain injury, then he must have sustained a serious injury.

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Answer:

350 m/s

Explanation:

In order for Boy to hear the sound, the sound  has to travel from his hands to the cliff, and then BACK to him from the cliff to his ears.

So the sound has to travel (2 x 420m) = 840 m.

Speed = (distance) / (time)

Speed = (840 m) / (2.4 sec)

Speed = 350 m/s

Answer:

350 m/s

Explanation:

D. 101.96 grams. Molar mass of Al2O3=2× Atomic mass of aluminium + 3× atomic mass of oxygen. =2×27+3×16=54+48=102g.

Sodium aluminate and water are produced when aluminum oxide Al 2 O 3 interacts with sodium hydroxide solution.Between 900 and 1100 ° C is the temperature at which this reaction occurs.Aluminum oxide functions as just an acid in this reaction.

Bauxite is the name of the aluminum ore (Al 2O 3).Bauxite is refined to create aluminum oxide, commonly known as alumina, which can be used to extract aluminum.Electrolysis is used to remove the metal, but first the aluminum oxide must be heated in order for electricity to flow through it.

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Answer:  The CORRECT Answer is :    203.92 grams

Explanation:         I took the test

Answer:

  C.  greater than D, but less than 2D

Explanation:

The amount of potential energy in the system is a function of the compression of the spring. That is the same for both masses.

The potential energy is transferred to kinetic energy when the spring is released. The kinetic energy is jointly proportional to the mass and the square of the velocity. That is, the velocity is inversely proportional to the square root of the mass, for the same kinetic energy.

The horizontal distance traveled will be proportional to the launch velocity. So a halving of the mass will increase the velocity by a factor of ...

  v2 = v1·√(1/(1/2)) = v1·√2

This means the second mass will land at a distance of about D√2, a value ...

  greater than D but less than 2D.

Answer:

A physical change is the change to the physical properties of an object.

Explanation:

As an example if I take a piece of paper and cut it in half that would be a physical change. Water freezing into ice is also a physical change.

Answer:

Satellites don't fall from the sky because they are orbiting Earth. Even when satellites are thousands of miles away, Earth's gravity still tugs on them. Gravity--combined with the satellite's momentum from its launch into space--cause the satellite go into orbit above Earth, instead of falling back down to the groundv

Explanation:

Answer:

C. I'm pretty sure because I just took that test but I'm not sure

Answer:

The force exerted by the load will decrease.

Explanation:

Hope this helped!

Answer:

τ = 5 s

Explanation:

When a vibrating body is damped. Its amplitude starts to decrease. This decrement is exponential. And it is given as follows:

[tex]X = X_{0}e^{-\frac{t}{2\tau}[/tex]

where,

τ = Time Constant = ?

X = Instantaneous value of amplitude

X₀ = Initial Value of amplitude

t = time interval = 10 s

The ratio of decrement is given as:

[tex]\frac{X}{X_0} = 36.8\% = 0.368[/tex]

therefore, using these values, we get:

[tex]\frac{X}{X_{0}} = 0.368 = e^{\frac{10\ s}{2\tau}}[/tex]

Taking natural log (ln) on both sides, we get:

[tex]ln(0.368) = \frac{10\ s}{2\tau}\\\\\tau = \frac{10\ s}{2ln(0.368)}[/tex]

τ = 5 s

The value of the time constant for the decrease in the amplitude of this oscillator is 5.

Given the following data:

To determine the value of the time constant:

Mathematically, the amplitude for damped harmonic motion is given by the formula:

[tex]X = X_o e^\frac{t}{2 \tau}[/tex]

Where:

Rearranging the formula, we have:

[tex]\frac{X}{X_o} = e^{-\frac{t}{2 \tau}}[/tex]

Substituting the given parameters into the formula, we have;

[tex]0.368 = e^\frac{-10}{2 \tau}\\\\ln(0.368) = \frac{-10}{2 \tau}\\\\-0.9997 = \frac{-10}{2 \tau}\\\\2 \tau \times -0.9997 = 10\\\\-1.9994\tau=-10\\\\\tau =\frac{-10}{-1.9994} \\\\\tau = 5.0[/tex]

Time constant = 5

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Option B. An electric motor uses electrical energy to produce mechanical energy.

An electric motor is used to transform electric electricity into mechanical power. An electric-powered motor is an electrical device that converts electric energy into mechanical electricity.

Maximum electric-powered motors operate thru the interaction among the motor's magnetic field and electric-powered contemporary in a wire winding to generate force inside the form of torque implemented on the motor's shaft.

Electric motors are devices that convert electrical strength into mechanical power, commonly in the form of rotational motion. In easy terms, they may be devices that use electric powered power to generate reason strength.

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Answer:

3 hours.

Explanation:

If speed is reduce of 5, then she drive at 35 mph.

so 35*3 = 105 miles in 3 hours.

Therefore, we get 3 hours.

Answer:

The starting position of this object is

3m.

The object is traveling at a velocity of

3m/s.

Answer:

it never moved (c or 3)

Explanation:

np

Answer:

Answer: B. 84 m/s

Explanation:

Uniform Speed Motion

It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time thus, the acceleration is constant.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the final speed is calculated as follows:

[tex]v_f=v_o+at[/tex]

The golf ball starts with an initial speed of 100 m/s and slows down at a=-8\ m/s^2. We are required to find the final speed at t=2 s:

[tex]v_f=100-8*2=100-16[/tex]

[tex]v_f=84\ m/s[/tex]

Answer: B. 84 m/s

Answer: Glucose

Explanation: