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3 years ago

14

Does anyone know how to solve this?

1 answer:

FromTheMoon [43]3 years ago

7 0

Yes. There is a substantial number of people ... members of Brainly as well as non-members ... students, puzzle solvers, and just average educated thinkers, who would be able to solve it.

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What is the acceleration of a ball traveling horizontally with an initial velocity os 20 meters/second and ,2.0 seconds later, a

ch4aika [34]

Acceleration is the rate of change of velocity, so can be calculated by:
a = v2 - v1 / t where v2 and v1 are the final and initial velocities of the object respectively and t is the time taken. Therefore the acceleration is:
a = 30 m/s - 20 m/s / 2.0 s = 10 m/s / 2.0 s = 5 m/(s^2)
Hope this helps!

5 0

4 years ago

A superball and a clay ball are dropped from a height of 10cm above a tabletop. They have the same mass 0.05kg and the same size

Olenka [21]

Answer:4.08 N

Explanation:

Given data

superball dropped from a height of 10 cm

Mass of ball $\left ( m\right )$ =0.05kg

time of contact $\left ( t\right )$ =34.3 $\times 10^{-3}$ s

Now we know impulse = $Force\times time\ of\ contact$ =Change in momentum

$F_{average}\times t$ = $m\left ( v-(-v)\right )$

and velocity at the bottom is given by

v= $\sqrt{2gh}$

$F_{average}\times 34.3\times 10^{-3}$ = $0.05\left ( 1.4-(-1.4)\right )$

$F_{average}$ =4.081N

5 0

3 years ago

How many high tides happen at a given coast in any 24 hour period?

gladu [14]

Answer: Two high and two low tides

Explanation:

6 0

4 years ago

Read 2 more answers

An elevator is moving down at a constant rate of 4 m/s. A person is standing on a scale that says the person weighs 80 N. When i

tresset_1 [31]

Answer:

The reading on the scale is 96.31 N.

Explanation:

When the elevator comes to a stop the speed decreases from 4 m/s to 0 m/s.

This means that it incurs deceleration. We can use the formula below to find out the force that is applied on the person during this deceleration:

F = mass * acceleration

Assuming the deceleration is constant, we have the following equation:

V = U + at

Where V = Final speed = 0

U = initial speed = 4

a = acceleration

t = time

Solving, we get:

0 = 4 + 2a

a = -2 m/s^2

Thus the object decelerates at 2 m/s^2

The mass of the person = 80 / 9.81 = 8.155 kg

F = 8.155 * 2

F = 16.31 N

Total weight = 80 + 16.31 = 96.31 N (This is the reading on the scale)

4 0

3 years ago

A rotating wheel requires 2.90-s to rotate through 37.0 revolutions. Its angular speed at the end of the 2.90-s interval is 97.2

goldenfox [79]

Answer:

Angular acceleration, $\alpha =20.32\ rad/s^2$

Explanation:

It is given that,

Displacement of the rotating wheel, $\theta=37\ rev=232.47\ radian$

Time taken, t = 2.9 s

Initial speed of the wheel, $\omega_i=0$

Final speed of the wheel, $\omega_f=97.2\ rad/s$

Let $\alpha$ is the angular acceleration of the wheel. Using the third equation of kinematics to find it as :

$\alpha=\dfrac{\omega_f^2-\omega_i^2}{2\theta}$

$\alpha=\dfrac{(97.2)^2}{2\times 232.47}$

$\alpha =20.32\ rad/s^2$

So, the angular acceleration of the wheel is $20.32\ rad/s^2$ . Hence, this is the required solution.

6 0

3 years ago