Answer:
a)
b)
Explanation:
From the exercise we know initial velocity, initial height
º
a) The range of the stone is defined by how far does it goes. From the theory of <u><em>free falling objects</em></u>, we have:
The stone strike the water at y=0
Solving for t, using the quadratic formula
or
Since time can't be negative, the answer is t=3.06s
Now, we can calculate the <u>range of the stone</u>
b) We can calculate the <u>velocity</u> were the stone strike the water using the following formula
The negative sign indicates that the stone is going down
Answer:
A: Sound waves produce an echo
Explanation:
because the cup is a hard smooth surface you can hear the voice
Answer:
a) 72.54° and It will take the woman 33.4m
Explanation:
The woman runs with a constant speed V1 = 6m/s
V2 = 20m/s
V1 = V2 cos θ
Cos θ= V1/V2= 6/20
Cos θ= 0.3
Cos^-1 0.3=72.54°
Using Range formular for projectile
R= (V2 Cos θ)/g (V2 Sin θ)^2 +sqrt(V2 Sin θ)^2 + 2gh)
R= (20cos72.54)(2Sin72.54+sqrt(20Sin72.54)^2 + 2×9.8×45
R=33.4m
b )
see the attached file
The characteristic of stars that primarily determines a star's color
is temperature. The correct
answer between all the choices given is the third choice. I am hoping that this
answer has satisfied your query and it will be able to help you in your
endeavor, and if you would like, feel free to ask another question.
Answer:
Microwaves and radio waves
Explanation:
The electromagnetic spectrum is the classification of the electromagnetic waves according to their wavelength.
From shortest to longest wavelength, they are classified as follows:
Gamma rays < 6 pm
X-rays 6 pm - 10 nm
Ultraviolet 10 nm - 380 nm
Visible light 380 nm - 750 nm
Infrared radiation
Microwaves
Radio waves > 0.3 m
From the list, we see that infrared rays have shorter wavelength than microwaves and radiowaves.