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andriy [413]
3 years ago
15

Explain why the angle is important when lauching projectiles

Physics
1 answer:
yaroslaw [1]3 years ago
6 0

Answer:

to have an accurate measure

Explanation:

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You come across an open container which is filled with two liquids. Since the two liquids have different density there is a dist
Slav-nsk [51]

Answer:

526.57 Pa

Explanation:

P ( pressure at the bottom of the container) = 1.049 × 10^5 pa

Using the formula of pressure in an open liquid

Pw ( pressure due to water) = ρhg where ρ is density of water in kg/m³, h is the height in meters, and g is acceleration due to gravity in m/s²

Pw = 1000 × 9.81 ×0.209 = 2050.29 Pa

P( atmospheric pressure) = 1.013 × 10^5 Pa

Pl ( pressure due to the liquid) = ρ(density of the liquid) × h (depth of the liquid) × g

Subtract each of the pressure from the absolute pressure at the bottom

P(bottom) - atmospheric pressure

(1.049 × 10^5) - (1.013 × 10^5) = 0.036 × 10^5 = 3600 Pa

subtract pressure due to water from the remainder

3600 - 2050.29 = 1549.71 Pa

1549.71 =  ρ(density of the liquid) × h (depth of the liquid) × g

ρ (density of the liquid) = 1549.71 / (h × g) = 1549.71 / (0.3 × 9.81) =526.57 Pa

4 0
3 years ago
(a) Find the size of the smallest detail observable in human tissue with 20.0-MHz ultrasound. (b) Is its effective penetration d
koban [17]

Answer:

(a) λ=77×10⁻⁶m

(b)Yes its enough to examine entire eye,

(c)λ=16.65μm.

Explanation:

The ultrasonic sound are used to detect problems in human body by using device consisting of transmitter and detector .

The speed of sound in human tissue is 1540m/s.

The wavelength of sound is 20MHz.

(a) let the velocity of sound in human tissue is v = 1540m/s.

                v=fλ

           λ= \frac{v}{f} =\frac{1540}{20MHz} = 77×10⁻⁶m

             λ=77×10⁻⁶m

(b)  we can scan effectively upto the depth of  about 500λ

                   500λ=500× (77×10⁻⁶)= 3.85cm

            Yes its enough to examine entire eye,

(c) In air the  velocity of sound is 331m/s.

              λ=\frac{v}{f}  = \frac{331 m/s}{20Mhz}  = 16.65μm

            λ=16.65μm.

           

5 0
2 years ago
The low point of a transverse wave is called a
DaniilM [7]
The answer is trough
8 0
2 years ago
Which statement best describes how waves carry energy?
ratelena [41]

Correct answer choice is :


A) Energy moves from one place to another through the wave.


Explanation:


Waves can carry energy over a range without moving matter the complete distance. For instance, an ocean wave can move many kilometers without the water itself traveling many kilometers. The water moves up and down a motion recognized as a disturbance. A wave brings its energy without carrying matter. Waves are observed to travel through an ocean or lake, yet the water perpetually reverts to its rest state. Energy is carried through the medium, yet the water particles are not carried.


7 0
3 years ago
Read 2 more answers
A person in a kayak starts paddling, and it accelerates from 0 to 0.65 m/s in a distance of 0.40 m. If the combined mass of the
SCORPION-xisa [38]

Answer:

Magnitude of the net force acting on the kayak = 39.61 N

Explanation:

Considering motion of kayak:-

Initial velocity, u =  0 m/s

Distance , s = 0.40 m

Final velocity, v = 0.65 m/s

We have equation of motion v² = u² + 2as

Substituting

   v² = u² + 2as

    0.65² = 0² + 2 x a x 0.4

    a = 0.53 m/s²

We have force, F  = ma

Mass, m = 75 kg

    F  = ma = 75 x 0.53 = 39.61 N

Magnitude of the net force acting on the kayak = 39.61 N

6 0
3 years ago
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