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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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A 15.0 mW laser puts out a narrow beam 2.00 mm indiameter.
Murljashka [212]

Answer:

1341.03 V/m

Explanation:

The power output per unit area is the intensity and also the is the magnitude of the Poynting vector.

                                 S = \frac{P}{A} = cε₀E^{2} _{rms}

                             ⇒ \frac{P}{A} = cε₀E^{2}_{rms}

Where;

P is the power output

A is the area of the beam

c is speed of light

ε₀ is permittivity of free space 8.85 × 10⁻¹² F/m

E_{rms} is the average (rms) value of electric field

Making electricfield E_{rms} the subject of the equation

                                 E^{2}_{rms} = P / Acε₀

                                 E_{rms} = √(P / Acε₀)

But area A = πr²

                                 E_{rms} = √(P / πr²cε₀)                    

Given:

Output power, P = 15 mW = 0. 015 W

Diameter, d = 2 mm = 0.002 m

⇒ Radius, r = \frac{d}{2} = \frac{0.002}{2} = 0.001 m

Solving for average (rms) value of electric field;     

E_{rms} = \sqrt{\frac{0.015 W}{\pi * (0.001 m)^2 * (3 * 10^8 m/s) * (8.85 * 10^-12) C^2/Nm^2} }

                                E_{rms} = 1341.03 V/m

                             

                         

                                 

                                 

                                 

6 0
3 years ago
A dart is thrown from 1.50 m high at 10.0 m/s toward a target 1.73 m from the ground. At what angle was the dart thrown?
Triss [41]

Answer:

The angle of projection is 12.26⁰.

Explanation:

Given;

initial position of the dart, h₀ = 1.50 m

height above the ground reached by the dart, h₁ = 1.73 m

maximum height reached by the dart, Hm = h₁ - h₀ = 1.73 m - 1.50 m= 0.23 m

velocity of the dart, u = 10 m/s

The maximum height reached by the projectile is calculated as;

H_m = \frac{u^2sin^2 \theta}{2g}

where;

θ is angle of projection

g is acceleration due to gravity = 9.8 m/s²

H_m = \frac{u^2sin^2 \theta}{2g}\\\\sin^2 \theta = \frac{H_m \ \times \ 2g}{u^2} \\\\sin^2 \theta = \frac{0.23 \ \times \ 2(9.8)}{10^2} \\\\sin ^2\theta =0.04508\\\\sin \theta = \sqrt{0.04508} \\\\sin \theta = 0.2123\\\\\theta  = sin^{-1}(0.2123)\\\\\theta  = 12.26^0

Therefore, the angle of projection is 12.26⁰.

6 0
2 years ago
Question 7 of 10
jok3333 [9.3K]

Answer:

when a magnet is hanged freely in air it turns in the direction of the north and south while the magnetic north pole faces the south pole of the earth and magnetic south pole faces the north pole if the earth

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3 years ago
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nikitadnepr [17]
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The peak intensity of radiation from Star Beta is 350 nm. In what spectral band is this? UV, radio waves, visible light, or infa
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