All categories

4 years ago

The persistence of vision for normal eye is

Physics

2 answers:

attashe74 [19]4 years ago

6 0

Answer:

The answer is 1/16

Explanation:

1. Persistence of vision refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye. 2. The persistence of vision for normal eye is 1/16 if a second.

pashok25 [27]4 years ago

4 0

Answer:

idk

Explanation:

You might be interested in

A 2.4 kg box has an initial velocity of 3.6 m/s upward along a plane inclined at 27◦ to the horizontal. The coefficient of kinet

Vika [28.1K]

Answer:

d= 1.18 m

Explanation:

In abscense of friction, total mechanical energy must be constant, i.e.,

ΔK + ΔU = 0

As we are told that there exists a kinetic friction between the box and the plane, we need to take into account the work done by the friction force in the equation, as follows:

ΔK + ΔU = Wnc (1)

If we take as our zero gravitational potential energy reference, the height at which the box is sent upward, we can write the following equations for the different terms in (1):

ΔK = Kf- K₀ = 0 - 1/2*m*v₀² = -1/2*2.4kg* (3.6)²(m/s)² = -15.6 J

ΔU = Uf - U₀ = m*g*h = *m*g*d*sin θ = 2.4 kg*9.81 m/s²*d*0.454 = 10.7*d J

Wnc = Ff. d* cos (180º) = μk*N*d*cos(180º) (2)

The friction force always opposes to the displacement, so the angle between force and displacement is 180º.

The normal force, as is always perpendicular to the surface, takes the value needed to equilibrate the component of the weight perpendicular to the incline, as follows:

N = m*g*cosθ = 2.4 kg*9.81 m/s²*cos 27º = 21 N

Replacing in (2):

Wnc = 0.12*21*cos (180º) = -2.52*d J

Replacing in (1):

-15.6 J + 10.7*d J = -2.52*d J

Solving for d:

d = 1.18 m

7 0

4 years ago

2. While hiking, you see a fragment of rock drop vertically from the edge of a cliff to the ground below. Which of the following

Dafna11 [192]

Answer:

Your answer would be B. fall

Explanation:

This is because sliding would be continuous it just said a fragment of rock fell vertically. Hope this helps

{/} OfficialQue09 {/}

8 0

3 years ago

Read 2 more answers

A bicyclist rides 1.94 km due east, while the resistive force from the air has a magnitude of 7.92 N and points due west. The ri

gtnhenbr [62]

Answer:

Negative work done of 30729.6 Joules

Explanation:

Since work done is dot product of force and displacement. so,

W= F.d

W= F d cosΘ

where Θ is the angle between force and displacement. Since resistive force and displacement makes an angle of 180 (as one is pointed east and other west). So,

W = (7.92)(1940)(cos (180)) (distance should be in meter)

W = 15364.8(-1)

W = -15364.8 (for going east)

Total work done will be twice of that as the resistive force and distance are same for the way back.

W = -15364.8 + (-15364.8)

W = -30729.6 Joules

5 0

3 years ago

The heating element of a water heater in an apartment building has a maximum power output of 37 kW. Four residents of the buildi

kkurt [141]

Answer:

maximum possible temperature is 34.088°C

Explanation:

Given data

power output Q = 37 kW

volume flow rate = 11 x 10^-5 m3/s

temperature t = 14°C

to find out

maximum possible temperature T

solution

we can say

total water volume = 4 residents × volume flow

total water volume = 4 × 11 x 10^-5 = 44 × 10^-5 m³/s

so we say total water mass = 1000 × volume

total water mass = 1000 kg/m³ × 44 × 10^-5

total water mass = 0.44 kg

we know

dQ/dt = (dm/dt)× (S)× ( T - t)

so here we know specific heat of water S = 4.186 joule/gram °C

37 = 0.44 × 4.186 × (T-14)

T = 34.088°C

maximum possible temperature is 34.088°C

3 0

3 years ago

The colors of the stars in the sky range from red to blue. Assuming that the color indicates the frequency at which the star rad

Crazy boy [7]

Answer:

a) 4458K b) 5048K, c) 6166K, d) 5573K

Explanation:

The temperature of the stars and many very hot objects can be estimated using the Wien displacement law

$\lambda_{max}$ T = 2,898 10⁻³ [m K]

T = 2,898 10⁻³ / $\lambda_{max}$

a) indicate that the wavelength is

Lam = 650 nm (1 m / 109 nm) = 650 10⁻⁹ m

Lam = 6.50 10⁻⁷ m

T = 2,898 10⁻³ / 6.50 10⁻⁷

T = 4,458 10³ K

T = 4458K

b) lam = 570 nm = 5.70 10⁻⁷ m

T = 2,898 10⁻³ / 5.70 10⁻⁷

T = 5084K

c) lam = 470 nm = 4.70 10⁻⁷ m

T = 2,898 10⁻³ / 4.7 10⁻⁷

T = 6166K

d) lam = 520 nm = 5.20 10⁻⁷ m

T = 2,898 10⁻³ / 5.20 10⁻⁷

T = 5573K

5 0

4 years ago

Read 2 more answers