I have no idea how to do this

The velocity of the wind relative to the water is crucial to sailboats. Suppose a sailboat is in an ocean current that has a vel

Brilliant_brown [7]

Answer:

Explanation:

We shall write the velocities given in vector form to make the solution easy.

The velocity of water with respect to earth that is waV(e) makes 30 degree with north or 60 degree with east so in vector form

waV(e) = 2.2 cos 60 i + 2.2 sin 60 j

waV(e) = 1.1 i + 1.9 j

Similarly , velocity of wind with respect to earth that is wiV(e) , is making 50 degree with west or - ve of x axes so we cal write it in vector form as follows

wiV(e) = - 4.5 cos 50 i - 4.5 sin 50 j

wiV(e) = - 2.89 i - 3.45 j

Now we have to calculate velocity of wind with respect to water that is

wiVwa

wiV( wa) = wiV ( e)+ eV(wa)

= wiV( e)- waV(e)

- 2.89 i - 3.45 j - 1.1 i - 1.9 j

= - 3.99 i - 5.35 j

Magnitude of this relative velocity

D² = 3.99² + 5.35²

d = 6.67 m /s

6 0

3 years ago

A mountain climber stands at the top of a 50.0 m cliff hanging over a calm pool of water. The climber throws two stones vertical

Sonbull [250]

Answer:

a. $t=2.997\ s$ is the time after which the two stone hit the water surface.

b. $u_2=1.998\ m.s^{-1}$

c. $v_1=31.3688\ m.s^{-1}$ & $v_2=31.3686\ m.s^{-1}$

Explanation:

Given:

height of the cliff, $h=50\ m$

time gap between the projection of stones, $\Delta t=1\ s$

initial velocity of first stone, $u_1=+2\ m.s^{-1}$

Here positive sign means that the stone is thrown vertically downward in the direction of gravity.

a.

Using equation of motion:

$h=u_1.t+\frac{1}{2} g.t^2$

$50=2t+4.9t^2$

$t=2.997\ s$ is the time after which the two stone hit the water surface.

b.

using the equation of motion for second stone:

$h=u_2.t+\frac{1}{2} g.t^2$

$50=u_2\times 2.997+4.9\times 2.997^2$

$u_2=1.998\ m.s^{-1}$

c.

Final velocity of the stone at the instant of touching the water surface:

$v_1^2=u_1^2+2.g.h$

$v_1^2=2^2+2\times 9.8\times50$

$v_1=31.3688\ m.s^{-1}$

&

$v_2^2=u_2^2+2g.h$

$v_2^2=1.998^2+2\times 9.8\times 50$

$v_2=31.3686\ m.s^{-1}$

6 0

4 years ago

Is thin humans more denser than fats??

yuradex [85]

Thin because muscle is denser than fat

5 0

4 years ago

what is the average velocity if the initial velocity of an object is 10 m/s and the final velocity ia 28 m/s ?

Sunny_sXe [5.5K]

The average can be calculated by adding up the the initial value and final value and divide it by 2
(10+28)/2= 19 m/s

6 0

2 years ago

Read 2 more answers

A 14-Ω coffee maker and a 14-Ω frying pan are connected in series across a 120-V source of voltage. A 20-Ω bread maker is also c

Ann [662]

Answer:

The total current supplied by the source of voltage = 10.29 A

Explanation:

We have a 14-Ω coffee maker and a 14-Ω frying pan are connected in series.

Effective resistance = 14 + 14 = 28Ω

Now we have 28Ω and 20Ω in parallel

Effective resistance

$R=\frac{28\times 20}{28+20}=11.67\Omega$

So we have resistor with 11.67Ω in a 120 V source of voltage.

We have equation V = IR

Substituting

120 = I x 11.67

I = 10.29 A

The total current supplied by the source of voltage = 10.29 A

8 0

3 years ago