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3 years ago

9

A tennis ball is tossed upwards into the air with an initial velocity of +5m/s, how much time does it take for the tennis ball t

o reach this point?

1 answer:

Sever21 [200]3 years ago

3 0

HOPE THIS HELPS YOU!!!!!

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True or false please help me now.

jolli1 [7]

Answer:

false

Explanation:

8 0

3 years ago

11111nata11111 [884]

We know, Mechanical Energy = K.E. + P.E.
As ball is at ground, P.E. would be zero. But as it is in motion, it must have some K.E. and that is:

K.E. = 1/2 mv²
K.E. = 1/2 * 1 * 2²
K.E. = 4/2
K.E. = 2 J

In short, Your Answer would be Option B

Hope this helps!

7 0

4 years ago

What is the main energy source that drives global climate?

marysya [2.9K]

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The correct option would be A. solar.

We also use solar energy to produce electricity.

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3 years ago

A measure of the amount of light received on Earth is a star's ____. a. apparent magnitude c. position in space b. absolute magn

Neko [114]

B. I hope this helps!!!

7 0

3 years ago

Read 2 more answers

At a certain location, wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power ge

Damm [24]

Answer:

$0.05\ \text{kJ/kg}$

$3141.6\ \text{kW}$

Explanation:

v = Velocity of wind = 10 m/s

A = Swept area of blade = $\dfrac{\pi}{4}d^2$

d = Diameter of turbine = 80 m

$\rho$ = Density of air = $1.25\ \text{kg/m}^3$

Wind energy per unit mass of air is given by

$E=\dfrac{v^2}{2}\\\Rightarrow E=\dfrac{10^2}{2}\\\Rightarrow E=50\ \text{J/kg}$

The mechanical energy of air per unit mass is $0.05\ \text{kJ/kg}$

Power is given by

$P=\rho AvE\\\Rightarrow P=1.25\times \dfrac{\pi}{4}\times 80^2\times 10\times 50\\\Rightarrow P=3141592.65=3141.6\ \text{kW}$

The power generation potential of the wind turbine is $3141.6\ \text{kW}$ .

7 0

3 years ago