______ images are obtained when the plane mirror are kept parallel to the each other

An archer uses a bow to fire two similar arrows with the same string force. One

Sveta_85 [38]

Answer:

answers the correct one is C

Explanation:

For this exercise we must use the projectile launch ratios

the expressions for the initial velocities are

sin θ =v_{oy} / vo

cos θ = v₀ₓ / vo

v_{oy} = v₀ sin θ

v₀ₓ = v₀ cos θ

Range and flight time are requested

the expression for the scope is

R = $\frac{ v_{o}^2 \ sin 2 \theta}{g}$

We calculate for each angle

θ = 45º

R₄₅ = \frac{ v_{o}^2 \ sin 90}{g}

R₄₅ = v₀² / g

θ = 60º

R₆₀ = \frac{ v_{o}^2 \ sin 120}{g}

sin 120 = sin 60

R₆₀60 = sin 60 R₄₅

as the sine function has values between 0 and 1, the range for this angle is less

Flight time is twice the time it takes to reach maximum altitude

v_y = v_{oy} - gt

at the point of maximum height there is no vertical velocity vy = 0

t = v_{oy} / g

t = v₀ sin θ / g

θ=45º angle

t₄₅ = sin 45 v₀/g

t₄₅ = 0.707 v₀/g

θ=60º angle

t₆₀ = sin 60 v₀/ g

t₆₀ = 0.86 v₀/g

the answer for this part is

R₄₅ > R₆₀

t₄₅ < t₆₀

when reviewing the different answers the correct one is C

6 0

3 years ago

.... Answer this...

AysviL [449]

the ansnwer is ATP and ADP whitch is why we need food

8 0

4 years ago

A satellite is in a circular orbit around the Earth at an altitude of 3.18x10 m. Find the period and th orbital speed of the sat

Leona [35]

Answer:

112.17 m/s

56.427 years

Explanation:

h = 3.18 x 10^10 m

R = 6.4 x 10^6 m

r = R + h = 3.18064 x 10^10 m

M = 6 x 10^24 kg

The formula for the orbital velocity is given by

$v = \sqrt{\frac{G M }{r}}$

$v = \sqrt{\frac{6.67 \times 10^{-11}\times 6\times 10^{24} }{3.18064\times 10^{10}}}$

v = 112.17 m/s

Orbital period, T = 2 x 3.14 x 3.18064 x 10^10 / 112.17

T = 0.178 x 10^10 s

T = 56.427 years

8 0

3 years ago

3.A golf ball is hit of it’s tee, 200m down the fairway.

Alinara [238K]

<u>Answers:</u>

3. The diagrams showing the forces acting on the golf ball are in the figure attached. Let’s have a detailed look:

a) Here the ball is under 2 forces:

F1 which is called The Normal force and is perpendicular to the surface of the tee where the ball rests

-F1, related to the gravity force, to the weight of the ball, and has the same magnitude, but the opposite direction (That’s why it has a negative sign).

In this case the sum of the forces is 0

b) Here we have again forces F1 and –F1, but in this very moment the club strikes the ball and we have:

F2, the force of the strike

c) While the ball is in its flight, it is under the following forces:

F1, the force of the lift through the air

-F2, the gravity force

-F3, the force of air resistance, also called drag

F4, the tangencial force of the ball flight

4. Here are the sizes and directions of the resultant forces:

i)Two forces of the same magnitude or size are applied to this block, but in opposite directions (in the x-axis). This is expressed as:

F=-10N+10N=0 The resulting force is zero

ii) Two forces of different size and opposite directions in the y-axis are applied to this block. The sum of the forces is:

F=30N-40N=-10N This means the resulting force is 10N applied downwards

iii) In this case the only force applied to the block is -5N applied downwards

iv) Here there are four forces applied to the block.

In the y-axis we have to forces of the same size but opposite directions:

F1=10N-10N=0 This means the applied force in the y-axis is zero

In the x-axis we have two forces of different size and opposite directions:

F2=-15N+10N=-5N This means the resulting force is applied to the –x-side

4 0

3 years ago

Describe two possibilities of what will happen to the universe in the future.

shutvik [7]

In our current view of the Universe there are 2 possible futures. One possiblity is that the Universe will come to an end in the opposite of a Big Bang called The Big Crunch. The other possibility is that we live in an Eternal Universe that will never come to end.

i hope this helps :)

4 0

3 years ago

______ images are obtained when the plane mirror are kept parallel to the each other​

______ images are obtained when the plane mirror are kept parallel to the each other