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Nady [450]
3 years ago
15

In the figure above, a box of mass 2.5kg is initially at rest on a rough inclined plane. Assuming the

Physics
1 answer:
neonofarm [45]3 years ago
5 0

Answer:

Explanation:

By work - energy theorem on the box

Wmg + wn + wf = kf - ki

=> mgh + 0 + wf = 1/2 mv^2f - 1/2mv^2i

=> wf = 1/2mv^2f - 1/2mv^2i - mgh

:. Wf = 1/2×2.5×4^2 - 0- 2.5×9.8×1.5

= 20 - 36.75

= -16.75 J

Work done comes out negative here which is expected as the friction always act opposite to the velocity of an object. Friction is a non conservative force and it causes loss of mechanical energy.

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. A spring has a length of 0.200 m when a 0.300-kg mass hangs from it, and a length of 0.750 m when a 1.95-kg mass hangs from it
kap26 [50]

Answer:

29.4 N/m

0.1  

Explanation:

a) From the restoring Force we know that :  

F_r = —k*x  

the gravitational force :  

F_g=mg  

Where:

F_r is the restoring force .

F_g is the gravitational force

g is the acceleration of gravity

k is the constant force  

xi , x2 are the displacement made by the two masses.

Givens:

<em>m1 = 1.29 kg</em>

<em>m2 = 0.3 kg  </em>

<em>x1   = -0.75 m  </em>

<em>x2 = -0.2 m </em>

<em>g   = 9.8 m/s^2  </em>

Plugging known information to get :

F_r =F_g

-k*x1 + k*x2=m1*g-m2*g

k=29.4 N/m

b) To get the unloaded length 1:  

l=x1-(F_1/k)

Givens:

m1 = 1.95kg , x1 = —0.75m  

Plugging known infromation to get :

l= x1 — (F_1/k)  

= 0.1  

 

3 0
3 years ago
A scientist just learned that she will not receive enough money to complete her year-long study about the
Softa [21]

Answer: It's A

conduct smaller studies for more than a one-year period

3 0
3 years ago
All objects within a closed system tend to move
Charra [1.4K]

Explanation is in the file

tinyurl.com/wpazsebu

4 0
3 years ago
You are holding a block of wood with dimensions 3 cm x 6 cm x 9 cm on the
Ainat [17]

Answer:

The normal force of weight will not differ for different placements but the force of pressure applied to the surface of your hand is per unit area. So the side with the smallest area.. 3 cm x 6 cm will exert the most pressure on your hand.

Please Give Brainliest

3 0
3 years ago
Mike and Juan were studying forces and decided to do an experiment. they placed four
lora16 [44]

Answer:

Friction.

Explanation:

The is friction because the blocks are different substances, and different substances are able to move across different flooring more easily.

3 0
3 years ago
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