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2 years ago

~NEED HELP ASAP~

Physics

1 answer:

Romashka-Z-Leto [24]2 years ago

8 0

Answer:

Centripetal Acceleration 18.75 m/s^2, Rotational Kinetic Energy 843.75 J

Explanation:

a Linear acceleration (we cant find tangential acceleration with the givens so we will find centripetal)

a= ω^2*r

ω= 300rev/min

convert into rev/s

300/60= 5rev/s

a= 18.75m/s^2

b) use Krot= 1/2 Iω^2

plug in gives

1/2(30*2.25)(25)= 843.75 J

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An electric flux of 147 N*m^2/C passes through a flat horizontal surface that has an area of 0.824 m^2. The flux is due to a uni

Tresset [83]

Answer:231.16 N/C

Explanation:

Given

Electric Flux $=147 N-m^2/C$

Area(A) $=0.824 m^2$

Given Field point above $31.6 ^{\circ}$

Therefore angle between Area vector Electric Field =90-31.6= $58.4^{\circ}$

We know that Flux is given by

$\phi =\vec{E}\cdot \vec{A}$

$\phi =EAcos\theta$

$147=E\times 0.824\times cos(58.4)$

E=231.16 N/C

4 0

3 years ago

A well-trained athlete can run 400m in 47s, what is the athlete’s velocity?

AnnZ [28]

Answer:

8.51 m/s

Explanation:

Velocity = Displacement/Time

Velocity = 400 m ÷ 47 s

Velocity = 8.51 m/s

7 0

2 years ago

Robert Hook discovered cells when viewing a _____ under a microscope.

sp2606 [1]

What you need to do while answering this questions, is ask yourself what has cells - only if a thing has cells can you see those cells under a microscope. Objects of animal and plant origin have cells, so blood, plant and cork (made of tree bark) can have cells, and a box too, if it's made of wood. So we can''t exclude any answers based on this. We must then know the story of Robert Hook - and it was in fact a cork. He did this discovery around 1655. At the time his main interest was the microscope rather than the cork, and he used to cork to demonstrate the function of the microscope. The correct answer is CORK.

3 0

3 years ago

Read 2 more answers

A 1.2-kg mass suspended from a spring of spring constant 22 N.m-1 executes simple harmonic motion of amplitude 5 cm. What is the

iren2701 [21]

Answer:

a) T = 1,467 s , b) A = 0.495 m , c) v = 4.97 10⁻² m / s

Explanation:

The simple harmonic movement is described by the expression

x = A cos (wt + Ф)

Where the angular velocity is

w = √ k / m

a) Ask the period

Angular velocity, frequency and period are related

w = 2π f = 2π / T

T = 2π / w

T = 2pi √ m / k

T = 2π √ (1.2 / 22)

T = 1,467 s

f = 1 / T

f = 0.68 Hz

b) ask the amplitude

The mechanical energy of a harmonic oscillator

E = ½ k A²

A = √2 E / k

A = √ (2 2.7 / 22)

A = 0.495 m

c) the mass changes to 8.0 kg

As released from rest Ф = 0, the equation remains

x = A cos wt

w = √ (22/8)

w = 1,658

x = 3.0 cos (1,658 t)

Speed is

v = dx / dt

v = -A w sin wt

The speed is maximum when without wt = ±1

v = Aw

v = 0.03 1,658

v = 4.97 10⁻² m / s

6 0

3 years ago

In a single movable pulley, a load of 500 N is lifted by applying 300 N effort. Calculate MA, VR and efficiency.

galben [10]

Answer:

in pulley there are different kinds.but the most common one are fixed,moveable and compound pulley. in this question we asked about movable pulley.

Explanation:

Given request solutions

L=500N a,M.A=? a,M.A=L/E =5/3

E=300N b,V.R=? b,V.R=2

c,efficiency =? c,£=M.A/V.R=5/6

£=IS NOT THE REAL SYMBOLS OF EFFICIENCY BUT I IS LOOK LIKE THIS

I THINK I HELPED

6 0

3 years ago

~~~~~NEED HELP ASAP~~~~~

~NEED HELP ASAP~