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Lemur [1.5K]
3 years ago
6

4. What is the acceleration of a rock if the net

Physics
1 answer:
HACTEHA [7]3 years ago
8 0

Answer:

0.75 m/s²

Explanation:

Newton's second law:

∑F = ma

3 N = (4 kg) a

a = 0.75 m/s²

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You and a friend each hold a lump of wet clay. Each lump has a mass of 25 grams. You each toss your lump of clay into the air, w
solniwko [45]

Answer:

a) p(total) = <0.05, 0.1, 0.1 > kg m/s

b) p = <0.05, 0.1, 0.1 > kg.m/s

c) v_f = < 1, 2, 2 > m/s

Explanation:

a.)

Mass of each lump = 25 g = 0.025 kg

Velocity of lump 1 = < -2, 0, -7 > m/s

Momentum of lump 1 = Mass×Velocity

                                   = 0.025×< -2, 0, -7 >

                                   = < -0.05, 0, 0.175> kg m/s

Velocity of lump 2 = < 4, 4, -3 > m/s

Momentum of lump 2 = Mass×Velocity

                                    = 0.025×< 4, 4, -3 >

                                    = < 0.1, 0.1, -0.075> kg m/s

Total momentum before impact  =  < -0.05,  0,  0.175 > + < 0.1, 0.1, -0.075>

                                                      = < 0.05, 0.1, 0.1 > kg m/s

⇒p(total) = <0.05, 0.1, 0.1 > kg m/s

b)

As we know that,

By the law of conservation of linear momentum,

The total momentum will be the same before and after the collision.

⇒Momentum of the stuck together  after the collision = Total momentum of the lumps just before impact.

⇒ p = <0.05, 0.1, 0.1 > kg m/s

c)

Let the final velocity =  v_f

Total mass = 0.025 + 0.025 = 0.05 kg

As

Momentum = mass ×velocity

⇒ <0.05, 0.1, 0.1 > = 0.05 ×v_f

⇒ v_f = <0.05, 0.1, 0.1 > / 0.05

          = < 1, 2, 2 > m/s

⇒v_f = < 1, 2, 2 > m/s

7 0
3 years ago
A truck travels due east for a distance of 1.9 km, turns around and goes due west for 8.7 km, and finally turns around again and
Hatshy [7]

Answer:

a) Total distance travelled = 1.9km + 8.7km + 3.0km = 13.6km

b) Total displacement = -1.9km + 8.7km-3.0km=+3.8km

Total displacement = 3.8km due west

Explanation:

a) Total distance travelled is a scalar quantity it is not affected by the direction it's only concerned with the magnitude.

Total distance travelled = 1.9km + 8.7km + 3.0km = 13.6km

b) Total displacement is a vector quantity it takes into consideration both magnitude and direction.

Taking west as positive and east as negative.

Total displacement = -1.9km + 8.7km-3.0km = +3.8km

Total displacement = 3.8km due west

8 0
3 years ago
Explain Any Ten Forces Briefly.​
icang [17]

Answer:

--->

Explanation:

1. Air Resistance- this is a type of frictional force that acts upon objects as they travel through air. It usually opposes the motion of an object and it is mathematically difficult to predict its value.

2. Gravity- the force of gravity is the force that the earth, and moon use to attract an object towards itself. The moon has far less gravity than earth. All objects on earth experience a force of gravity that pulls them downward, towards the center of the earth.

3. Tension- the tension force is the force that is transmitted through a string, rope, cable or wire when it is pulled from opposite ends. The tension force is directed along the length of the wire and pulls equally on the objects on the opposite ends of the wire

4. Friction- this is the force exerted by a surface when an object moves across it. Friction results from the two surfaces being pressed together closely.

5. Electromagnetic force- although they don't seem similar, electricity and magnetism are related. Flowing electrons produce magnetism, and a moving magnet produces electricity.

6. Upthrust- this is the upward force that a liquid or gas exerts on a body floating in it.

7. Spring force- The spring force is the force exerted by a compressed  spring upon any object that is attached to it. This object is always acted upon by a force that restores the object to its rest or equilibrium position.

8. Applied force- An applied force is a force that is applied to an object by a person or another object.

9. Electrostatic force- The types of forces exerted by all electrically charged bodies on another charged bodies in the universe are ‘electrostatic forces’. They can be either positively or negatively charged.

10. Nuclear force- these are the forces that act between two or more nucleons. They bind protons and neutrons into atomic nuclei. The nuclear force is about 10 millions times stronger than the chemical binding that holds atoms together in molecules.

7 0
3 years ago
According to current evidence, what happens when gays or lesbians rear a child?
Lena [83]

Answer: The answer is A.

Explanation:

Just because u have gay parents doesnt mean theyre bad lol XD

5 0
1 year ago
The number of vacancies in some hypothetical metal increases by a factor of 5 when the temperature is increased from 1080 K to 1
Elena L [17]

Answer:

E = 15.7 KJ/mol

Explanation:

The number of vacancies in a metal is given by

      n = n₀ e^{-E/KT}

They tell us that

     n = 5 no

We replace

      5 n₀ = n₀   e^{-E/KT}

      -E / KT = ln 5

       E = KT ln 5

       E = 1,381 10⁻²³  1170 ln 5

        E = 2.6 10⁻²⁰ J

To take (J / mol) we multiply between Avogadro's number

        E = 2.6 10⁻²⁰ 6.022 10²³

        E = 1.57 10⁴ J / mol

        E = 15.7 KJ/mol

6 0
3 years ago
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