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3 years ago

A volleyball player bumps a ball across a net with the velocity and angle shown below. What is the maximum height of the ball?

Physics

1 answer:

Marrrta [24]3 years ago

6 0

Answer:

D. 12.4 m

Explanation:

Given that,

The initial velocity of the ball, u = 18 m/s

The angle at which the ball is projected, θ = 60°

The maximum height of the ball is given by the formula

h = u² sin²θ/2g m

Where,

g - acceleration due to gravity. (9.8 m/s)

Substituting the values in the above equation

h = 18² · sin²60 / 2 x 9.8

= 18² x 0.75 / 2 x 9.8

= 12.4 m

Hence, the maximum height of the ball attained, h = 12.4 m

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A typical value for the coefficent of quadratic air resistance on a cyclist is around c=0.20 N/m(m/s)2. Assuming thath the total

lesantik [10]

Answer:

Characteristic time τ=20 s

When V = 15 m/s

t = 6.66 s

When V = 10 m/s

t = 20 s

When V = 5 m/s

t = 60 s

Explanation:

Given that

c=0.20 N/m(m/s)2

m = 80 kg

Vo=20m/s

Characteristic time τ=m/cvo.

$\tau =\dfrac{m}{c.V_o}$

$\tau =\dfrac{80}{0.2\times 20}$

Characteristic time τ=20 s

We know that velocity after t time given as follows

$V =\dfrac{V_o}{1+\dfrac{\tau}{t}}$

When V = 15 m/s

$15 =\dfrac{20}{1+\dfrac{20}{t}}$

t = 6.66 s

When V = 10 m/s

$10 =\dfrac{20}{1+\dfrac{20}{t}}$

t = 20 s

When V = 5 m/s

$5 =\dfrac{20}{1+\dfrac{20}{t}}$

t = 60 s

5 0

3 years ago

The thickest and strongest chamber in the human heart is the left ventricle, responsible during systole for pumping oxygenated b

Bess [88]

Answer:

(a). The blood travel during this acceleration is 0.0231 m.

(b). The time for the blood to reach its peak speed is 0.0459 sec.

Explanation:

Given that,

Acceleration = 22.0 m/s²

Speed = 1.01 m/s

(a). We need to calculate the distance

Using equation of motion

$v^2=u^2+2as$

Where, v = final speed

u = initial speed

a = acceleration

s = distance

Put the value into the formula

$(1.01)^2=0+2\times22.0\times s$

$s=\dfrac{(1.01)^2}{2\times22.0}$

$s=0.0231\ m$

(b). We need to calculate the time

Using equation of motion

$v =u+at$

Put the value into the formula

$1.01=0+22t$

$t=\dfrac{1.01}{22}$

$t=0.0459\ sec$

Hence, (a). The blood travel during this acceleration is 0.0231 m.

(b). The time for the blood to reach its peak speed is 0.0459 sec.

4 0

3 years ago

Superman lived on another planet where the acceleration due to gravity is 23.6 m/s2 . If a woman falls from a building that is 8

dusya [7]

Acceleration due to gravity = 2.6m/s²

Length of building = d = 88.3m

Time he needed before she hits the ground = ?
we can find the time by using the formula;

D = 1/2at²

Now putting the value;

88.3 = (1/2) a t²

88.3 = 1/2 x 23.6 x t²

t² = 88.3 / 11.8

= 7.48

t = 2.735 seconds

4 0

3 years ago

An object has 4J of kinetic energy and 16J of potential energy. How much mechanical energy does it have?

Ostrovityanka [42]

Answer: C. 20J

Explanation: im pretty sure sorry if im wrong :(

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4 years ago

A car traveling at 100km/hr .how many hours will it take to cover a distance of 750 km

grin007 [14]

Answer:

7.5 right?

Explanation: if im wrong shoot me

4 0

3 years ago

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