Ask question

Ask question

All categories

3 years ago

8

A tennis ball is thrown straight up with an initial speed of 22.5 m/s. It is caught at the maximum height of its arc.

1 answer:

zysi [14]3 years ago

4 0

To calculate the maximum height, we can use:
2as = v² - u²; where v is 0 at the maximum height, a is -9.81 m/s² and u is 22.5 m/s
2 x -9.81s = -(22.5)²
s = 25.8 m, your answer is correct.

The time of flight of the ball can be given by:
v = u + at; v = 0 at max height
0 = 22.5 - 9.8t
t = 2.30 seconds
It is caught at its maximum height so its time in the air is 2.30 seconds.

You might be interested in

Si las velocidades del viento y un avión tienen la

r-ruslan [8.4K]

Answer: Viendo que los aviones viajan muy raramente exactamente en la misma dirección que el para compensar continuamente tanto la dirección como la velocidad del vientoLos vientos en contra significa exactamente lo contrario; se necesita más combustible y el vuelo llevará más tiempo condiciones secas y húmedas, pero el piloto tiene la decisión final sobre si.

7 0

3 years ago

What is a common noun?

Rainbow [258]

I HOPE IT WILL HELP YOU.

Thank you.

<u>TEDDYLOVER</u>

6 0

2 years ago

An alternating-current (AC) source supplies a sinusoidally varying voltage that can be described with the function v of t is equ

Marrrta [24]

Answer:

ω, the angular frequency of the source equals 377 rad/s

Explanation:

From the question, V(t) = V cosωt.

Now, ω = the angular frequency of the sinusoidal wave is given by

ω = 2πf where f = the frequency of the source = 60 Hz

So, the angular frequency of the source ,ω = 2π × the frequency of the source.

So, ω = 2πf

ω = 2π × 60 Hz

ω = 120π rad/s

ω = 376.99 rad/s

ω ≅ 377 rad/s

So, ω, the angular frequency of the source equals 377 rad/s

3 0

3 years ago

Two children are riding on the edge of a merry-go-round that has a mass of 100.kg and radius of 1.60m and is rotating at 20.0rpm

Gre4nikov [31]

Here since both children and merry go round is our system and there is no torque acting on this system

So we will use angular momentum conservation in this

$I_1\omega_1 = I_2\omega_2$

now here we have

$I_1 = \frac{MR^2}{2} + m_1R^2 + m_2R^2$

$I_1 = \frac{100(1.60)^2}{2} + (22 + 28)(1.60)^2$

$I_1 = 256$

Now when children come to the position of half radius

then we will have

$I_2 = \frac{MR^2}{2} + m_1(\frac{R}{2})^2 + m_2(\frac{R}{2})^2$

$I_2 = \frac{100(1.6)^2}{2} + (28 + 22)(0.8)^2$

$I_2 = 160$

now from above equation we have

$256 (20.0 rpm) = 160(\omega_2)$

$\omega_2 = 32 rpm$

8 0

3 years ago

Which of the following most accurately describes the development of the antibiotic penicillin?

I am Lyosha [343]

Answer:

C.) Fleming shows that the Penicillium mood could kill bacteria and observed that it was very effective when taken orally or intravenously

7 0

4 years ago

Read 2 more answers