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bonufazy [111]
2 years ago
5

Can someone check my answer thanks ! 2.The ability to do work or cause change is called A.velocity. B.energy.(I PICK B.) C.trans

fer. D.friction. 3.Which type of energy is demonstrated by a person jogging?
A.electrical energy B.nuclear energy C.electromagnetic energy D.kinetic energy(I PICK D) 4.Which is the type of energy available in food? A.electromagnetic B.gravitational C.chemical(I PICK C) D.kinetic 5.Dan does 188.0 J of work raking leaves. If the rake does 128.0 J of work, what is the efficiency of the rake?
A.68.1 percent(I PICK A) B.147.0 percent C.60.0 percent D.316.0 percent 6.Which type of energy transformation is taking place when natural gas is used to heat water?
A.chemical energy into thermal energy(I PICK A) B.thermal energy into mechanical energy C.mechanical energy into electromagnetic energy D.electromagnetic energy into chemical energy 7.The energy associated with the motion and position of an object is called
A.kinetic energy. B.potential energy. C.gravitational potential energy. D.mechanical energy.(I PICK D) ****I ACTUALLY HAD 2 CHOICES FOR 7 SO MY OTHER ANSWER IS A*****
Physics
2 answers:
Lelechka [254]2 years ago
7 0
2 is B.  3 is D.   4 is C.   I think 5 is A.   6 is A.   7 is D.   I think you are all correct. Good Luck!
Rudiy272 years ago
3 0

Answer:

2. B. energy

3. D.kinetic energy

4. C. chemical

5. A.68.1 percent

6. A.chemical energy into thermal energy

7. D.mechanical energy

Explanation:

2. <em>Energy</em> is  the ability of matter to produce <em>work</em> in the form of movement, light, heat, etc.

3.  The <em>kinetic energy</em> of a body is that energy it possesses due to its movement.

4 <em>.Chemical energy</em> is the energy stored in the bonds of chemical compounds (atoms and molecules).

5. Efficiency can be calculated as (128J/188J)*100= 68%

6. Chemical energy is defined in item 4 and thermal energy is a type of energy that bodies possess when exposed to the effect of heat. It is precisely what produces that the atoms that make up the molecules are in constant motion either moving or vibrating.

7. Mechanical energy is the energy that bodies present because of their movement (kinetic energy), and their situation with respect to another body, usually the earth.

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Two +1 C charges are separated by 30000 m, what is the magnitude of<br> the force?
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Answer:

<em>The magnitude of the force is 10 N</em>

Explanation:

<u>Coulomb's Law</u>

The electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between the two objects.

Written as a formula:

\displaystyle F=k\frac{q_1q_2}{d^2}

Where:

k=9\cdot 10^9\ N.m^2/c^2

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We have two identical charges of q1=q2=1 c separated by d=30000 m, thus the magnitude of the force is:

\displaystyle F=9\cdot 10^9\frac{1*1}{30000^2}

\displaystyle F=9\cdot 10^9\frac{1*1}{30000^2}

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A 3,000 kg truck moving at +10 m/s hits a 1,000 kg parked car which moves off at +15 m/s What is the velocity of
Rina8888 [55]

Answer:

v₃ = 5 [m/s]

Explanation:

To solve this problem we must use the definition of linear momentum, which tells us that momentum is equal to the product of mass by Velocity.

P = m*v

where:

P = linear momentum [kg*m/s]

m = mass [kg]

v = velocity [m/s]

We must also clarify that the momentum is preserved i.e. it is equal before the collision and after the collision

Pbeforecollision = Paftercollision

(m₁*v₁) + (m₂*v₂) = (m₁*v₃) + (m₂*v₄)

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m₁ = mass of the truck = 3000 [kg]

v₁ = velocity of the truck = 10 [m/s]

m₂ = mass of the car = 1000 [kg]

v₂ = velocity of the car before the collision = 0 (the car is parked)

v₃ = velocity of the truck after the collision [m/s]

v₄ = velocity of the car after the collision = 15 [m/s]

(3000*10) + (1000*0) = (3000*v₃) + (1000*15)

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3000*v₃ = 30000 - 15000

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