PLEASE HELP!!!

Your tennis ball rolls off a 0.91m tall table and hits 0.25m out from the table. What is it's time in the air? What is its verti

sladkih [1.3K]

consider the motion of the ball in vertical direction after it rolls off the table

v₀ = initial velocity of the ball in vertical direction = 0 m/s

a = acceleration = acceleration due to gravity = 9.8 m/s²

Y = vertical displacement = height of the table = 0.91 m

t = time spent in air by the ball

Using the kinematics equation

Y = v₀ t + (0.5) a t²

0.91 = 0 t + (0.5) (9.8) t²

t = 0.43 sec

v = final velocity in vertical direction just before it hits the ground

Using the kinematics equation

v = v₀ + at

v = 0 + (9.8) (0.43)

v = 4.21 m/s

6 0

3 years ago

At a maximum level of loudness, the power output of a 75-piece orchestra radiated as sound is 72.0 W. What is the intensity of t

FrozenT [24]

Answer:

<em> The intensity would be 0.01432 W/</em> $m^{2}$ <em></em>

Explanation:

The sound intensity is the power that is transmitted by a sound wave per unit area.

Given that

Power output P of the 75-piece orchestra = 72.0 W

The listener's distance r = 20.0 m

The intensity of sound waves (I) can be obtained with the expression below;

I = P/A .............. 1

where P is the power

A is the area, in this case, at the distance r the sound is radiated through a sphere.

A = area of a sphere = 4π $r^{2}$

putting it into equation 1, the intensity would be;

I = P/ 4π $r^{2}$

Substituting our values we have;

I = 72.0 W / 4 π $20^{2}$ $m^{2}$

I = 0.01432 W/ $m^{2}$

Therefore the intensity would be 0.01432 W/ $m^{2}$

3 0

3 years ago

This is an image of a stream table modeling how water can change surface features of Earth. Which of the following processes is

DaniilM [7]

The answer would be deposition

3 0

3 years ago

Technician A says that gears may be used to apply torque to other rotating parts. Technician B says that gears may be used to mu

Goryan [66]

Answer:

Both technicians are right.

Explanation:

Torque is defined as a rotational force that can be calculated by the formula T= F.d. Being F the force applied to a body to make it rotate and d the distance since the force is applied.

$T= F . d$

So technician A is saying that gear can apply a torque to another gear, and that is true because it’s applying a rotational force to the gear next to it, in simple terms -anytime I make something rotate, I'm generating a torque-. And for technician B, the torque also can vary as a function of the distance of the force applied (size of the gear), so, it can multiply the torque and change the rotation speed.

5 0

4 years ago

A high-diver of mass 59.8 kg jumps off a board 10.0 m above the water. If, 1.00 s after entering the water his downward motion i

irinina [24]

la respuesta correcta es la "E"

6 0

3 years ago