What is the tangential velocity of a record player which makes 11 revolutions in 20 seconds?

Answer:

A incresing speading up

Explanation:

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.

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.

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:

Answer:

what do u need help with

Explanation:

B. 360 N

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.

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

Answer:

Kinetic energy is the energy in moving objects or mass. Examples include mechanical energy , electrical energy etc.

Answer:

calculation presented a speed of 125,000 miles per second (200,000 km/s).

Explanation:

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.

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.

Answer:

Precision: closeness of your measurements to each other

Accuracy: closeness of your measurements to a specific value

Hope this helps

Explanation:

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

Answer:

Explanation:

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

Hope this helps you

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

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

Answer:

i hardly havent got teach this sorry

Answer:

Explanation:

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

Hope this helps you

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:

Answer: Speed and velocity are both measured using the same units. The SI unit of distance and displacement is the meter. The SI unit of time is the second. The SI unit of speed and velocity is the ratio of two — the meter per second .

Explanation: Hopefully this helps you.

Answer:

Sexual reproduction

Explanation:

Its what its called hope it helps

Answer:

i think its called allogamy

Explanation:

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)

the distance of satellite from earth is 2,240,000 m

Answer:

b on E2020

Explanation:

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: