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4 years ago

A concave mirror always forms a virtual image of a real object. O True O False

Physics

1 answer:

kifflom [539]4 years ago

4 0

Answer:

The given statement is false.

Explanation:

The spherical mirrors are the mirror that are a part of a sphere. Concave and convex mirrors are two types of spherical mirrors.

A concave mirror always forms real and inverted image. A convex mirror forms real and virtual images.

For concave mirror, the value of magnification is less that 1. Also, the focal length is negative for concave mirrors.

So, the given statement is false as a concave mirror always forms a real and inverted image. Hence, this is the required solution.

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Two blocks of ice, one four times as heavy as the other, are at rest on a frozen lake. A person pushes each block the same dista

ANEK [815]

Answer:

The kinetic energy of the heavier block after the push is equal to the kinetic energy of the lighter block

Explanation:

Kinetic energy of smaller object

$K=(1/2)mv^2$

where m= mass of smaller object and v= velocity of smaller object

Also, it is given that heavier object is four times the mass of lighter object and consider its velocity as V

kinetic energy of heavier block $K '= (1/2) (4m) V^2$

Now, For smaller block , $v^2 - u^2=2aS$

[by Newtons laws of motion]

Also, $v^2 = 2(F/m)S$

Where S= displacement, F= force, u= initial velocity

So, $K=(1/2)m[2(F/m)]S$

$\Rightarrow K = FS$

For heavier block ,

$V^2 - u^2 = 2a'S$

or, $V^2=2(F /4m)S$

So, $K '= (1/2)(4m)[2(F/4m)S$

$\Rightarrow K'= FS$

Therefore the kinetic energy of the heavier block after the push is equal to the kinetic energy of the lighter block

5 0

4 years ago

Henrietta is jogging on the side-walk at 3.05 m/s on the way to her physics class. Bruce realizes that she forgot her bag of bag

shusha [124]

Answer:

12.9121148614 m/s

35.9393048982 m

Explanation:

t = Time taken

u = Initial velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s² = a

$s=ut+\frac{1}{2}at^2\\\Rightarrow 38=0t+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow t=\sqrt{\frac{38\times 2}{9.81}}\\\Rightarrow t=2.78337865516\ s$

Time taken for the bag to fall is 2.78337865516 seconds

Time she has been jogging for

9+2.78337865516 = 11.78337865516 seconds

Total distance traveled by her

$s=vt\\\Rightarrow s=3.05\times 11.78337865516=35.9393048982\ m$

Henrietta is 35.9393048982 m away

Velocity of throwing

$\dfrac{35.9393048982}{2.78337865516}=12.9121148614\ m/s$

The velocity of throwing is 12.9121148614 m/s

3 0

4 years ago

Almost all cells are microscopic.

Degger [83]

Answer:

It's True...................

4 0

3 years ago

What is the quality of the sound of a fire truck’s siren when it moves toward a stationary hearer?

Doss [256]

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Its High Pitched

</span>

What is the quality of the sound of a fire truck’s siren when it moves away from a stationary hearer?

Its Low Pitched

6 0

3 years ago

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This question looks so simple , but I don’t want to get it won’t could I get help .

Doss [256]

Answer:

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Explanation:

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3 years ago

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