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3 years ago

. 30

Physics

1 answer:

schepotkina [342]3 years ago

7 0

Answer:

Explanation:

Length if the bar is 1m=100cm

The tip of the bar serves as fulcrum

A force of 20N (upward) is applied at the tip of the other end. Then, the force is 100cm from the fulcrum

The crate lid is 2cm from the fulcrum, let the force (downward) acting on the crate be F.

Using moment

Sum of the moments of all forces about any point in the plane must be zero.

Let take moment about the fulcrum

100×20-F×2=0

2000-2F=0

2F=2000

Then, F=1000N

The force acting in the crate lid is 1000N

Option D is correct

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Sindrei [870]

Explanation:

a) copper

b) olive oil

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7 0

3 years ago

When an object is placed just outside the focal length of a concave mirror, the image is

swat32

Answer:

O larger than the object and real

Explanation:

As we know by the formula of mirror

$\frac{1}{d_i} + \frac{1}{d_o} = \frac{1}{f}$

here we know that

$d_o = (f_o + x)$

so we have

$\frac{1}{d_i} = \frac{1}{f_o} - \frac{1}{f_o + x}$

so we have

$d_i = \frac{(f_o)(f_o + x)}{x}$

so magnification is given as

$M = -\frac{d_i}{d_o}$

$M = - \frac{f_o}{x}$

so here we have

$|M| > 1$

so image will be larger than object and real

8 0

3 years ago

Express each of the following in ms -1 <br>a) 18kmh-1<br>

vovangra [49]

1km=1000m; 1hr=3600secs
1km/hr=1000/3600= 5/18m/sec
To convert km/hr into m/sec, multiply the number by 5 and then divide it by 18.

18kmh-1= 18•5=90
90/18=5
5ms-1

3 0

3 years ago

An object moves with constant acceleration 3.45 m/s2 and over a time interval reaches a final velocity of 14.0 m/s.

Sav [38]

Assuming the object was originally at rest, it must have been traveling for
14.0/3.45 = 4.06 seconds

4 0

3 years ago

Balanced- Forces acting on an object are balanced if the ....

choli [55]

Answer:

there is an equal and opposite force
moving

Explanation:

When balanced forces act on an <em>object at rest</em>, the object will not move. If you push against a wall, the wall pushes back with an equal but opposite force. Neither you nor the wall will move. Forces that cause a change in the motion of an object are unbalanced forces.

7 0

4 years ago