All categories

3 years ago

An object 82 cm high forms a virtual image 4.1 cm high located 4.6 cm behind a mirror. Find the object distance.

Physics

1 answer:

ioda3 years ago

8 0

Answer:

The object distance is 92 cm.

Explanation:

let v be the image distance and h be the height of the image, let u the be the object distance and H be the height of the object.

then, the magification of the mirror is given by:

m = -v/u and m = h/H

so, -v/u = h/H

u = -v×H/h

= -(-4.6)×(82)/(4.1)

= 92 cm

Therefore, the object distance is 92 cm.

You might be interested in

Two parallel plates of equal area carry equal and opposite charge Q0. The potential difference between the two plates is measure

jonny [76]

Answer:

Q₁ > Qo

C₁ > Co

Explanation:

We know that

$C_o=\dfrac{\varepsilon _oA}{d}$

Lets take relative permitivity of green plate =k

So new capacitance value

$C_1=k\dfrac{\varepsilon _oA}{d}$

From above two expression we can say that

C₁ = kCo

k > 1

So we can say that

C₁ > Co

We also know that

Co = Qo V

C₁ = Q₁ V

From above we can say that

Co/C₁ = Qo/Q₁ ( C₁ > Co ⇒Co/C₁ <1)

Co/C₁ <1

So we can say that

Qo/Q₁ < 1

Q₁ > Qo

3 0

3 years ago

Determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s.

ozzi

Answer:

The thrust is $6\times 10^6\ N$

Explanation:

Given that,

Mass of gas, $m=1.5\times 10^3\ kg$

The rate at which the gas is expelling, $\dfrac{dv}{dt}=4\times 10^{3}\ m/s$

We need to find the thrust produced by the gas.

We know that force is equal to the rate of change of momentum. So,

$F=\dfrac{p}{t}$

Also, p = mv

$F=\dfrac{mv}{t}$

So,

$F=1.5\times 10^3\times 4\times 10^3\\\\F=6\times 10^6\ N$

So, the thrust is $6\times 10^6\ N$

3 0

4 years ago

One group of students uses different methods to conserve water as listed below.

Deffense [45]

The best answer is b) Method 1 and Method 3

Method 2, which is part of every other options, does involve using extra water because the dishwasher will necessarily use extra water, even if it is full when you use it.
On the other hand, fixing leaky faucets requires no extra water and the recycled water used to wash your car has already been used.

3 0

4 years ago

If 5J of work are done on a spring, compressing it by 12cm, what is the spring constant?

mash [69]

Answer:

k=694.44

Explanation:

PE=1/2kx^2

5=1/2k*.12^2

5=1/2k(.0144)

divide both sides by .0144

3 0

3 years ago

What is characteristic of both sound waves and

REY [17]

"(2) They transfer energy" is the best option from the list regarding the characteristics of both sound waves and electromagnetic waves, but these energies are different.

5 0

4 years ago

Read 2 more answers