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3 years ago

What is the lens equation?

Physics

2 answers:

Sergeeva-Olga [200]3 years ago

8 0

Answer:

1/V + 1/U = 1/F

Explanation:

Lens equation is

1/V + 1/U = 1/F

F = focal length

V = distance of image from the lens

U = distance of object from the lens

Note –

a) Distance of real object & image is negative and positive in sign respectively

b) Height above the optic axis are positive while height below the optic axis will be taken as negative

Strike441 [17]3 years ago

7 0

The lens equation gives d relation between focal length, object distance n image distance.

1/f = 1/v + 1/u

seldon

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Fig. 2.1 shows a train

Vitek1552 [10]

Answer:

$\mathrm{(a)\:}32,000,000\:\mathrm{Ns},\\\mathrm{(b)\:}390,000\:\mathrm{N}$

Explanation:

The impulse-momentum theorem states the impulse on an object is equal to the change in momentum of that object. Momentum is given by $p=mv$ . Since mass is constant, the train's change in momentum is:

$\Delta p=m\Delta v=750,000\cdot42=31,500,000=\fbox{$32,000,000\:\mathrm{Ns}$}$ (two significant figures).

Impulse is also given as $\Delta p = F\Delta t$ , where $F$ is the average force applied and $\Delta t$ is change in time. Since $t$ is given as $80\mathrm{s}$ , we have the following equation:

$F\Delta t=\Delta p\\\\F=\frac{\Delta p}{\Delta t},\\\\F=\frac{31,500,000}{80},\\\\F=393,750=\fbox{$390,000\:\mathrm{N}$}$ (two significant figures).

7 0

3 years ago

You place a small air cart on a 4.00 m air track and set it into motion with a speed of 0.75 m/s. Due to very good elastic bumpe

san4es73 [151]

Answer:

6 seconds

0.167 Hz

Explanation:

Distance = 4 m

Velocity = 0.75 m/s

Period is given by

$T=2\times Distance\times Velocity\\\Rightarrow T=2\times 4\times 0.75\\\Rightarrow T=6\ s$

The period of the motion is 3 seconds

Frequency is given by

$f=\frac{1}{T}\\\Rightarrow f=\frac{1}{6}\\\Rightarrow f=0.167\ Hz$

The frequency of the motion is 0.33 Hz

3 0

3 years ago

If a trapeze artist rotates once each second while sailing through the air, and contracts to reduce her rotational inertia to on

finlep [7]

Answer:

There are finally 4 rotations per second.

Explanation:

If a trapeze artist rotates once each second while sailing through the air, and contracts to reduce her rotational inertia to one fourth of what it was. We need to find the final angular velocity. It is a case of conservation of angular momentum such that :

$I_1\omega_1=I_2\omega_2$