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3 years ago

15

A song is playing on a radio. Which of the following best

2 answers:

PtichkaEL [24]3 years ago

6 0

One is the best choice for an answer.

Aneli [31]3 years ago

6 0

A: electrical energy is changed to sound energy.

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What can you caculate if you know the frequency and speed of a wave

Mila [183]

Frequency and speed = wavelength.

4 0

4 years ago

A weightlifter is attempting a biceps curl with a 200 n barbell. the moment arm of the barbell about the elbow joint is 40 cm. t

CaHeK987 [17]

Weight of the barbell W = 200 Ndistance of the joint is r = 40 cm = 0.4 mtorque created by the weight at the joint is τ = F*r = 200 N*0.4 m = 80 N.mat equilibrium condition , Στ = force*distance - 80 N.m = 0 F'*0.4 - 80 N.m = 0 F'*0.4 = 80 force F' = 200 N

4 0

3 years ago

Four point masses of 3.0 kg each are arranged in a square on masslessrods. The length of a side of the square is 0.50m. What is

Zigmanuir [339]

Answer:

Part a)

$I = 1.5 kg m^2$

Part b)

$I = 0.75 kg m^2$

Part c)

$I = 1.5 kg m^2$

Explanation:

Part a)

Moment of inertia of the system about an axis passing through B and C is given as

$I = mL^2 + mL^2 + m(0) + m(0)$

$I = 2mL^2$

$I = 2(3 kg)(0.50^2)$

$I = 1.5 kg m^2$

Part b)

Moment of inertia of the system about an axis passing through A and C is given as

$I = m(0^2) + m(\frac{L}{\sqrt2})^2 + m(0) + m(\frac{L}{\sqrt2})^2$

$I = 2m\frac{L^2}{2}$

$I = (3 kg)(0.50^2)$

$I = 0.75 kg m^2$

Part c)

Moment of inertia of the system about an axis passing through the center of the square and perpendicular to the plane of the square

$I = m(\frac{L}{\sqrt2})^2 + m(\frac{L}{\sqrt2})^2 + m(\frac{L}{\sqrt2})^2 + m(\frac{L}{\sqrt2})^2$

$I = 4m\frac{L^2}{2}$

$I = 2(3 kg)(0.50^2)$

$I = 1.5 kg m^2$

8 0

3 years ago

Physics Question (attached)

hammer [34]

Answer:

The answer is " $\bold{10.6 \ \ \frac{m}{s^2}}$ "

Explanation:

The Formula of acceleration:

$\bold{a= \frac{v-v_0}{t}}$

Given value:

$t= 50\\v= 856\\v_0= 324$

Calculating the acceleration:

$\to a = \frac{(856 - 324)}{50}\\\\$

$= \frac{(532)}{50}\\\\= \frac{(106.4)}{10}\\\\= 10.64 \ \ \frac{ m}{s^2}$

8 0

3 years ago

The speed of the cat

klemol [59]

You awser is c to the question

3 0

3 years ago