Which of the following is not a good reason to take lessons in a sport?

It would be impossible to build a microscope that could use visible light to see the molecular structure of a crystal because. I

Serhud [2]

Answer:

the correct one is: a diffraction limits the resolving power to approximately the size of the wavelength of the light used

Explanation:

To be able to solve two structures with a light source, the Rayleigh criterion must be met that stable the two structures are solved when the first minimum of diffraction at one point is in the code of the first maximum of the other point

Using this criterion we can find an expression for the first minimization of the diffraction spectrum m = 1

sin θ tea = λ / a

now the structure of the comatose has a separation of around 1 nm and the wavelength of visible light ranges from 400 to 700 nm, when substituting we find

sin θ = 400/1 10

sin θ = 400

sin θ = 700/1

sin θ = 700

These values are neither impossible since the sin function is bounded between -1 to 1, so we cannot see the diffraction

When reviewing the different statements, the correct one is: a diffraction limits the resolving power to approximately the size of the wavelength of the light used:

6 0

3 years ago

Water has a density of 1.0 g/cm3. Glycerin, a liquid used in some soaps, has a density of 1.26 g/cm3. If an object sinks in wate

nasty-shy [4]

3. An object will float if its density is less than the matter it is submerged in.

If it sinks in water, its density is more than 1. If it floats in glycerin, its density is less than 1.26.

4 0

4 years ago

1. A car with an initial velocity of 5m/s acceaccelerates uniformly at 3 metre per second square until it reaches a velocity of

alisha [4.7K]

Explanation:

here, u = 5m/s,a = 3m/s2, v = 23m/s, t = ?, s = ?

v = u+at

23 = 5 + 3t

t = 23- 5/3 = 18/3 = 6 sec

s= ut + 1/2 at ^2

s = 5 * 6 + 1/2 * 3 * (6)^2

s = 30 + 1/2 * 3 * 36

s = 30 + 18 * 3

s= 30 + 54 = 84 m

here, u = 0, a = x, t = 5min = 300 sec, s= 5.8km = 5800m

s = ut + 1/2 at^2

5800 = 0 * 300 + 1/2 * x * (300)^2

5800 = 1/2 * x * 90000

5800= 45000 x

x = 5800/45000

x = 0.12m/sec^2

here, v = 0, t = 6sec, s = ?, a = - 9.8m/s2

s = UT + 1/2 at ^2

s = 29.4 * 3 + 1/2 * - 9.8 * (3)^2

s= 88.2 - 44.1

s= 44.1 m

s = ut + 1/2 at ^2

s = 0 * 1 + 1*2 * 9.8 * (1)^2

s = 4.9m

hope it helps you

8 0

3 years ago

A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal. (a) Determi

sattari [20]

Answer:

(a) t = 3.74 s

(b) H = 136.86 m

(c) Vₓ = 41.83 m/s, Vy = 0 m/s

(d) ax = 0 m/s², ay = 9.8 m/s²

Explanation:

(a)

Time to reach maximum height by the projectile is given as:

t = V₀ Sinθ/g

where,

V₀ = Launching Speed = 55.6 m/s

Angle with Horizontal = θ = 41.2°

g = 9.8 m/s²

Therefore,

t = (55.6 m/s)(Sin 41.2°)/(9.8 m/s²)

t = 3.74 s

(b)

Maximum height reached by projectile is:

H = V₀² Sin²θ/g

H = (55.6 m/s)² (Sin²41.2°)/(9.8 m/s²)

H = 136.86 m

(c)

Neglecting the air resistance, the horizontal component of velocity remains constant. This component can be evaluated by the formula:

Vₓ = V₀ₓ = V₀ Cos θ

Vₓ = (55.6 m/s)(Cos 41.2°)

Vₓ = 41.83 m/s

Since, the projectile stops momentarily in vertical direction at the highest point. Therefore, the vertical component of velocity will be zero at the highest point.

Vy = 0 m/s

(d)

Since, the horizontal component of velocity is uniform. Thus there is no acceleration in horizontal direction.

ax = 0 m/s²

The vertical component of acceleration is always equal to the acceleration due to gravity during projectile motion:

ay = 9.8 m/s²

3 0

3 years ago

You are standing on a log and a friend is trying to knock

WINSTONCH [101]

Answer: catching the ball is a better choice.

Explanation:

The collision of 2 objects involves involves large impact force since the force is inversely proportional to the time in which the momentum of the object changes.

Mathematically

$F=\frac{\Delta p}{\Delta t}$

If we catch the ball we increase the time in which the momentum of the ball is decreased thus the impact force that acts on us is lower as larger time is allowed for the ball to decrease it's momentum.

If we allow the ball to hit us the momentum of the ball changes in a short period of time thus applying a large impact force on our body thus increasing the chances of toppling.

3 0

3 years ago