All categories

3 years ago

Calculate the power of convex lens of focal length 20cm

Physics

1 answer:

maxonik [38]3 years ago

6 0

D = 1/f, where D is the power in diopters and f is the focal length in meters.

D=1/20

D=0.05

You might be interested in

HELP - What are some good topics to add to a Pipeline presentation? So yes, a presentation about pipelines, like for example in

In-s [12.5K]

Talk about the jobs that pipeline construction provides to citizens and wether or not it’s effects are ultimately eco-friendly

6 0

3 years ago

What must the diver's minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, wh

Dafna1 [17]

Answer:

1.08 m/s

Explanation:

This can be solved with two steps, first we need to find the time taken to fall 9.5 m, then we can divide the horizontal distance covered with time taken to calculate the velocity.

Time taken to fall 9.5 m

vertical acceleration = a = 9.8 m/s^2.

vertical velocity = 0, (since there is only horizontal component for velocity, )

distance traveled s = 9.5 m.

Substituting these values in the equation

$s= u \timest+0.5at^{2}$

$t= \sqrt{\frac{2s}{g} }$

$t=\sqrt{\frac{2\times9.5}{9.8} }$

⇒ t= 1.392 sec

Velocity needed

We know the time taken (1.392 s) to travel 1.5 m,

So velocity = 1.5 m / 1.392 s = 1.08 m/s

hence velocity of the diver must be at least 1.08 m/s

4 0

3 years ago

Type the correct answer in the box. Spell the word correctly.

Veronika [31]

Answer:

Vaccination is the procedure by which a person can be immunized against a disease.

6 0

3 years ago

What is her velocity? 1.5 m/s 2 m/s 2.5 m/s 5 m/s

fiasKO [112]

Answer:

There is no actual question attached to this, to get a real answer be sure to include the documents/question that is provided on your work.

Explanation:

7 0

3 years ago

Read 2 more answers

A 140 kg load is attached to a crane, which moves the load vertically. Calculate the tension in the cable for the following case

Murljashka [212]

Answer:

The answer is below

Explanation:

A 140 kg load is attached to a crane, which moves the load vertically. Calculate the tension in the

cable for the following cases:

a. The load moves downward at a constant velocity

b. The load accelerates downward at a rate 0.4 m/s??

C. The load accelerates upward at a rate 0.4 m/s??

Solution:

Acceleration due to gravity (g) = 10 m/s²

a) Given that the mass of the crane (m) is 140 kg. If the load moves downward, the tension (T) is given by:

mg - T = ma

Since the load has a constant velocity, hence acceleration (a) = 0. Therefore:

mg - T = m(0)

mg - T = 0

T = mg

T = 140(10) = 1400 N

T = 1400 N

b) If the load moves downward, the tension (T) is given by:

mg - T = ma

T = mg - ma = m(g - a)

T = 140(10 - 0.4) = 140(9.96) = 134.4

T = 134.4 N

c) If the load moves upward, the tension (T) is given by:

T - mg = ma

T = ma + mg = m(a + g)

T = 140(0.4 + 10) = 140(10.4)

T = 145.6 N

2) To find the distance (s) if the load move from rest (u= 0) and accelerates for 20 seconds (t = 20). We use:

s = ut + (1/2)gt²

s = 0(20) + (1/2)(10)(20)²

s = 2000 m

7 0

3 years ago

Calculate the power of convex lens of focal length 20cm​

Calculate the power of convex lens of focal length 20cm