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3 years ago

AAAAAAAAAH

Physics

2 answers:

stiv31 [10]3 years ago

7 0

Answer:

II only

Explanation:

For heat to flow from one object to another, there must be a temperature difference between them. Temperature is a measure hotness or coldness of an object or a body.

An object consists of vibrating molecules, thus molecular kinetic energy. The measure of the average kinetic energy of an object is its temperature. Thus, when object A has higher temperature (hotter) than B, heat would flow from A to B.

Dimas [21]3 years ago

4 0

Answer:

l and lll

Explanation:

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To measure the coefficient of kinetic friction by sliding a block down an inclined plane the block must be in equilibrium.

lozanna [386]

Answer:

Explanation:

A block sliding down an inclined plane, is subject to two external forces along the slide.
One is the component of gravity (the weight) parallel to the incline.
If the inclined plane makes an angle θ with the horizontal, this component (projection of the downward gravity along the incline, can be written as follows:

$F_{gp} = m*g* sin \theta (1)$

(taking as positive the direction of the movement of the block)

The other force, is the friction force, that adopts any value needed to meet the Newton's 2nd Law.
When θ is so large, than the block moves downward along the incline, the friction force can be expressed as follows:

$F_{f} = \mu_{k} * N (2)$

The normal force, adopts the value needed to prevent any vertical movement through the surface of the incline:

$N = m*g* cos \theta (3)$

In equilibrium, both forces, as defined in (1), (2) and (3) must be equal in magnitude, as follows:

$m*g* sin \theta = \mu_{k} * m*g* cos \theta$

As the block is moving, if the net force is 0, according to Newton's 2nd Law, the block must be moving at constant speed.
In this condition, the friction coefficient is the kinetic one (μk), which can be calculated as follows:

$\mu_{k} = tg \theta$

8 0

3 years ago

Gravity is dependent on which of the two factors?

k0ka [10]

Gravity is dependent on Mass & Distance

7 0

4 years ago

A 0.280-kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with

Jet001 [13]

Answer:

mass of second ball is 0.84 kg

Explanation:

mass of ball = 0.280 kg

to find out

mass of the second ball

solution

we know here elastic head on collision and

second ball moves = half the original speed

we consider here m1 mass of 1st ball and m2 mass of second ball

v1 = velocity of first ball before collision

v2 = velocity of second ball before collision

v3 = velocity of first ball after collision

v4 = velocity of second ball after collision

so here

we know 2nd ball was on rest so v2 = 0

after collision v4 = 1/2 ( v1)

and we know head on collision so

v3 = - v1/2

so from law of conservation of mass

m1v1 + m2v2 = m1v3 + m2v4

put here value

m1v1 + m2(0) = m1(-v1/2) + m2(v1/2)

solve and we get

m2 = 3m1

m2 = 3( 0.280) = 0.84

mass of second ball is 0.84 kg

7 0

4 years ago

If you press as hard as you can against a brick wall until you begin to sweating and breathing hard did you do any work on the w

Reika [66]

No, as long as nothing moves you aren't doing work, since W=F.s. You have no s, so no W

4 0

3 years ago

5 reasons why people should use electricity wisely

Bingel [31]

Answer:

1. heating

2. entertainment

3. cooling

4.educational purpose

5.comfort

8 0

3 years ago