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spayn [35]
4 years ago
10

A horizontal 694 N merry-go-round of radius 1.96 m is started from rest by a constant horizontal force of 61.5 N applied tangent

ially to the merry-go-round. Find the kinetic energy of the merry-go round after 3.89 is. The acceleration of gravity is 9.8 m/s 2 . Assume the merry-go-round is a solid cylinder. Answer in units of J.

Physics
2 answers:
Fittoniya [83]4 years ago
8 0

Answer:

808.19J

Explanation:

Image attached gives a proper explanation

Lady bird [3.3K]4 years ago
3 0

Answer: 808.24625J

Explanation:

Moment of inertia is the physical quantity, that expresses the tendency of a body to resist angular acceleration. It determines the Torque needed for a desired angular acceleration, about a rotational axis

I = 1/2mr²

I = 1/2(W/g)r²

I = 1/2 * 694/9.8 * 1.96²

I = 1/2 * 272.048

I = 136.024kgm²

Also,

Iα = Fr

136.024α = 61.5*1.96

136.024α = 120.54

α = 120.54/136.024

α = 0.8862 rad/s²

Angular Velocity,

ω = αt

ω = 0.8862*3.89

ω = 3.4473 rad/s

K = 1/2Iω²

K = 1/2*136.024*3.4473²

K = 1/2 * 1616.4925

K = 808.24625J

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The winning time for a 500.0 mile circular race track was 3 hours and
lyudmila [28]

Explanation:

We have,

Distance traveled in a circular track is 500 miles

The winning time was 3 hours and  13 minutes. It means time is 3.217 hours.

The driver's average speed is given by total distance divided by total time taken. Its formula can be written as :

v=\dfrac{d}{t}\\\\v=\dfrac{500\ miles}{3.217\ h}\\\\v=155.42\ mph

At the end of the race, the driver reaches the point form where he has started. It means the displacement of the driver is equal to 0. Hence, driver's average velocity is equal to 0.

3 0
4 years ago
Water at 45 C and 10 kPa enters an adiabatic pump and is discharged at a pressure of 8600 kPa.The pump efficiency is 75%. Calcul
tester [92]

Answer:

Explanation:

find the solution below

7 0
3 years ago
I need help idk if it’s C or D?
alex41 [277]
I think the answer is D.
6 0
3 years ago
HELPPP!! Thanks!
vagabundo [1.1K]

Answer:

ok my brudda this makes no sense are you trying to fart or take a dump like what do you mean "increase the particle motion of a gas" sound like you need to take a massive dump or a massive fart so its bbc big black you know what saying

Explanation:

because its a bbc  .

5 0
3 years ago
A driver brings a car to a full stop in 2.0 s. If the car was initially
vagabundo [1.1K]

Answer:

\boxed {\boxed {\sf D. \  -11 \ m/s^2}}

Explanation:

Acceleration can be found by dividing the change in velocity by the time.

a=\frac{v_f-v_i}{t}

where Vf is the final velocity, Vi is the initial velocity, and t is the time.

Since the car came to a complete stop, it's final velocity was 0 meters per second.

The initial velocity was 22 meters per second.

The time was 2.0 seconds.

v_f=0 \ m/s\\v_i=22 \ m/s\\t= 2.0 \ s

Substitute the values into the formula.

a=\frac{0 \ m/s-22 \ m/s}{ 2.0 \s }

Subtract in the numerator first.

  • 0 m/s- 22 m/s = -22 m/s

a=\frac{-22 \ m/s}{2.0 \ s}

Divide.

a= -11 \ m/s^2

The acceleration of the car was -11 meters per square second. The negative acceleration indicates slowing down/stopping.

8 0
3 years ago
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