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3 years ago

How much time does it take for a car travelling at 5m/s in 21 metres

Physics

2 answers:

Paha777 [63]3 years ago

7 0

Answer:

21/5 seconds or 4.2 seconds

Explanation:

Distance=Speed*Time

21=5 *Time

21/5=Time

4.2=time

Flura [38]3 years ago

5 0

Answer:21/5 seconds

Explanation:

Time =speed÷distance

Time=21/5 seconds

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A playground merry-go-round has a mass of 115 kg and a radius of 2.50 m and it is rotating with an angular velocity of 0.520 rev

tatuchka [14]

Answer:

$W_f = 2.319 rad/s$

Explanation:

For answer this we will use the law of the conservation of the angular momentum.

$L_i = L_f$

so:

$I_mW_m = I_sW_f$

where $I_m$ is the moment of inertia of the merry-go-round, $W_m$ is the initial angular velocity of the merry-go-round, $I_s$ is the moment of inertia of the merry-go-round and the child together and $W_f$ is the final angular velocity.

First, we will find the moment of inertia of the merry-go-round using:

I = $\frac{1}{2}M_mR^2$

I = $\frac{1}{2}(115 kg)(2.5m)^2$

I = 359.375 kg*m^2

Where $M_m$ is the mass and R is the radio of the merry-go-round

Second, we will change the initial angular velocity to rad/s as:

W = 0.520*2 $\pi$ rad/s

W = 3.2672 rad/s

Third, we will find the moment of inertia of both after the collision:

$I_s = \frac{1}{2}M_mR^2+mR^2$

$I_s = \frac{1}{2}(115kg)(2.5m)^2+(23.5kg)(2.5m)^2$

$I_s = 506.25kg*m^2$

Finally we replace all the data:

$(359.375)(3.2672) = (506.25)W_f$

Solving for $W_f$ :

$W_f = 2.319 rad/s$

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3 years ago

Suppose your hair grows at the rate 1/31 in. per day. find the rate at which it grows in nanometers per second. because the dist

kati45 [8]

Hair grows at rate of 9.20nm/s.

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The answer to the question<u> What shape is the graph produced by a force vs acceleration graph</u> is A. Linear

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Since this is a linear relationship, the graph of force vs acceleration will be linear.

The answer to the question<u> What shape is the graph produced by a force vs acceleration graph</u> is A. Linear

Learn more about graphs here:

brainly.com/question/24322515

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2 years ago

1 point

klio [65]

Answer:

100 g

100

200

300

400

500

108

Explanation:

ikkk

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3 years ago

Which best describes the difference between internal and thermal energy?

Dominik [7]

Internal energy cannot be transferred whereas, thermal energy is the energy due to temperature difference

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