5) Choose the correct statement about the waves shown below.

Need help on this question ASAP please and thank you!! (:

mamaluj [8]

I = F.Δt

for the first 4 s

I = 10 (4-2)

I = 20 kg m/s

5 0

2 years ago

Which statement describes what will most likely occur when warm air cools and the temperature drops to the

Alchen [17]

Answer:

Water Vapor in the air will evaporate

Explanation:

if im wrong please correct me. But i believe that is the right answer.

5 0

3 years ago

Read 2 more answers

A spaceship flies past Mars with a speed of 0.985c relative to the surface of the planet. When the spaceship is directly overhea

ycow [4]

Answer:

A) The time of the observer on the surface of the mars is the proper time.

B) Duration = 434.65 μs

Explanation:

A) From the question, we see that the signal light blinked on the Martian surface which is the same frame of reference of the observer at rest. Hence, we can say that the time of the observer on mars is the proper time.

B) time dilation equation is given as;

Δt =γ•Δt(o)

Where Δt is the duration of the light pulse measured by the pilot of the spaceship.

γ = 1/(√(1-β²))

Now,

β is expressed as β = u/c

Thus;

γ = 1/(√(1-(u/c)²)) = 1/(√(1-(u²/c²)))

Where, u is the speed of the spaceship relative to the surface of planet mars.

From the question, u = 0.985c

Thus, plugging in the relevant values, we obtain;

Δt = [1/(√(1-(0.985²c²/c²))] x 75

Δt = [1/(√(1-(0.985²))] x 75 = [1/(√(0.029775)]75= 5.7953 x 75 =

434.65μs

5 0

4 years ago

Which aspect of the personality exists from birth?

Kisachek [45]

I believe the correct answer from the choices listed above is option 1. The aspect of the personality that exists from birth would be the Id. Id is the only component of personality that is present from birth.<span> It is the source of our bodily needs, wants, desires, and impulses, particularly our sexual and aggressive drives.</span>

4 0

3 years ago

An electron is released from rest in a uniform electric field. The electron accelerates vertically upward, traveling 4.50 m in t

Liono4ka [1.6K]

(a) 5.69 N/C, vertically downward

We can calculate the acceleration of the electron by using the SUVAT equation:

$d=ut+\frac{1}{2}at^2$

where

d = 4.50 m is the distance travelled by the electron

u = 0 is the initial velocity of the electron

$t=3.00 \mu s = 3.0 \cdot 10^{-6} s$ is the time of travelling

a is the acceleration

Solving for a,

$a=\frac{2d}{t^2}=\frac{2(4.50)}{(3.0\cdot 10^{-6})^2}=1.0\cdot 10^{12} m/s^2$

Given the mass of the electron,

$m=9.11\cdot 10^{-31} kg$

We can find the electric force acting on the electron:

$F=ma=(9.11\cdot 10^{-31})(1.0\cdot 10^{12})=9.11\cdot 10^{-19}N$

And the electric force can be written as

$F=qE$

where

$q=-1.6\cdot 10^{-19}C$ is the charge of the electron

E is the magnitude of the electric field

Solving for E,

$E=\frac{F}{q}=\frac{9.11\cdot 10^{-19}}{-1.6\cdot 10^{-19}}=-5.69 N/C$

The negative sign means that the direction of the electric field is opposite to the direction of the force (because the charge is negative): since the force has same direction of the acceleration (vertically upward), the electric field must point vertically downward.

(b) Yes

We can answer the question by calculating the magnitude of the gravitational force acting on the electron, to check if it is relevant or not. The gravitational force on the electron is:

$F=mg$

where

$m=9.11\cdot 10^{-31} kg$ is the mass of the electron

$g=9.81 m/s^2$ is the acceleration due to gravity

Substituting,

$F=(9.11\cdot 10^{-31})(9.81)=8.93\cdot 10^{-30}N$

We see that the gravitational force is basically negligible compared to the electric force calculated in part (a), therefore we can say it is justified to ignore the effect of gravity in the problem.

7 0

4 years ago