Ask question

Ask question

All categories

3 years ago

14

A boy runs at a speed of 3.3 m/s straight off the end of a diving board that is 3 meters above the water. How long is he airborn

e before he hits the water?

1 answer:

svp [43]3 years ago

7 0

Answer:

45

Explanation:

You might be interested in

A 4watt night light is left on for 8 hours each night. how much work does it do per night

nlexa [21]

Power = (work) / (time)

Work = (power) x (time)

= (4 watts) x (8 hours)

1 "watt" = 1 joule/sec .

Work = (4 joule/sec) x (8 hours) x (3,600 sec/hr)

= (4 x 8 x 3,600) joules = 1,024 joules .

==================================

Another way:

4 watts = 0.004 kilowatt

Work = energy = (power) x (time)

= (0.004 kw) x (8 hrs) = 0.032 kilowatt-hour .

7 0

4 years ago

PLZ HELP!! List properties of ions.

Andreas93 [3]

Ionic compounds typically have high melting and boiling points, and are hard and brittle. when melted or dissolved they become highly conductive, because the ions are mobilized.

3 0

3 years ago

Train is traveling at an initial velocity of 68.325m/s. After 23.75 seconds it speeds up to a final velocity of 79.32m/s. What i

wariber [46]

So,

We know that:
$acceleration = \frac{ final\ velocity\ -\ initial\ velocity}{time}$

Plug in the values.
$acceleration = \frac{79.32 m/s^{2}\ -\ 68.325m/s^{2}}{23.75 secs}$
$acceleration = \frac{10.995m/s^{2} }{23.75 secs}$
$acceleration = 0.4629 m/s^{2}$

8 0

4 years ago

A closely wound rectangular coil of 100 turns has dimensions of 27.0 cm by 50.0 cm . The plane of the coil is rotated from a pos

kicyunya [14]

Answer:

$\epsilon =71.677V$ induced.

Explanation:

We define all our variables,

$B=1.2T$

$A=0.27m*0.50m$

$\theta= 90-37$

$\Delta T= 0.09s$

$N= 100$

EMF induced is given through the expression

$\epsilon = \frac{-N\Delta \Phi}{\Delta t}$

Here we understand $\Phi$ as

$\Phi = BAcos\theta$

We proceed to calculate the entire Initial Flow as the final, as well

$\Phi_i=(1.2)(0.27*0.5)cos(90-37) = 0.09749Tm^2$

Final Flow

$\Phi_f=(1.2)(0.27*0.5)= 0.162Tm^2$

Now, if $\Delta t = 0.09s$ ,

$\epsilon= (100)(0.162Tm^2 - 0.09749Tm^2)/(0.09s)$

$\epsilon =71.677V$ induced.

NOTES:

<em>It is necessary to make two small notes regarding the development of the exercise. The subtraction of the angles is used since the exercise indicates that the angle is between the field B and the Plane. However, the measurement between the Area and the field is required b.</em>
<em>Negative signs can be neglected because it is understood that this is a reference to know which direction has the highest potential.</em>

8 0

4 years ago

When a rubber ball dropped from rest bounces off the floor, its direction of motion is reversed because; *

irakobra [83]

Answer:

friction and spin

Explanation:

There are two things that make the ball bounce backwards: friction and spin. Friction is a force that occurs whenever two objects are pressed together. ... Rubber balls are very elastic, which means that when they hit something they bounce back in the opposite direction.

7 0

3 years ago