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2 years ago

Which of the following objects has kinetic energy?

Physics

2 answers:

kotykmax [81]2 years ago

5 0

Answer:

Explanation:

A body has kinetic energy that is moving

RoseWind [281]2 years ago

4 0

Answer:

B - A hockey puck gliding across the ice.

Explanation:

All the other 3 options possess potential energy, where the object stands, sits, or lays where it is. There is only one option that is an example of kinetic energy. And that option is B.

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Which two statements are true of electromagnetic waves?

Usimov [2.4K]

Answer:

B and C

Explanation:

Because EMWs are varying magnetic and electric radiation traveling at 90° to each other propagating energy form one place to another through vibration of these magnetic and electric fields

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2 years ago

Which direction will the box move?

Yuki888 [10]

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As it's negative the box will move left

3 0

2 years ago

If we assume that, in the African savanna, the predator population remains constant, what other, nonmobile, factor would influen

RSB [31]

The food chain system would also affect it. If the antelopes don't have the right food or a low supply of it they might not stay in that area.

7 0

3 years ago

Particle A has half the mass and eight times the kinetic energy of particle B. What is the speed ratio vA / vB?

Marta_Voda [28]

Answer:

Use the equation "KE=½mv²", and use some algebra. > "Particle A has two times the mass...of particle B" mA = 2mB > "Particle A has...8 situations the kinetic power of particle B" KE_A = 8(KE_B) or: ½(mA)(vA)² = 8(½(mB)(vB)²) the rest is uncomplicated algebra: in basic terms sparkling up the above equation for "vA/vB". (hint: start up by utilising dividing the two factors by utilising "(mB)(vB)²". Then make the substitution: mA/mB = 2 (from the 1st eq0.5 ma * VA^2 = 8 * 0.5 * mb * VB^2

0.5 * 0.5*mb * VA^2 = 8 * 0.5 * mb * VB^2

0.5 * 0.5* VA^2 = 8 * 0.5 * VB^2

VA/VB = 4uation))

Explanation:

8 0

3 years ago

A hiker walks from

Artyom0805 [142]

(a) The distance travelled by the hiker is 7.16 km

(b) If the hiker desires to return to his starting point, he should move at 201.71° with respect to east.

Form a right angled triangle with the distance between initial and final points as hypotenuse. The adjacent side will be the total distance travelled on x-direction and the opposite side will be the total distance travelled in y-direction.

Adjacent side = $x_{2}$ - $x_{1}$ = 3.05 - ( - 3.6 )

Adjacent side = 6.65 km

Opposite side = $y_{2}$ - $y_{1}$ = 5.9 - 3.25

Opposite side = 2.65 km

According to Pythagoras theorem,

$Hypotenuse^{2}$ = $Opposite side^{2}$ + $Adjacent side^{2}$

$Hypotenuse^{2}$ = $2.65^{2}$ + $6.65^{2}$

Hypotenuse = √ ( 7.02 + 44.22 )

Hypotenuse = 7.16 km

sin θ = Opposite side / Hypotenuse

sin θ = 2.65 / 7.16

θ = $sin^{-1}$ ( 0.37 )

θ = 21.71°

This is the angle in which the hiker travelled from initial to final direction. The angle in which the hiker should travel to return to initial point with respect to east is

θ = 21.71° + 180°

θ = 201.71°

Therefore,

(a) The distance travelled by the hiker is 7.16 km

(b) If the hiker desires to return to his starting point, he should move at 201.71° with respect to east.

To know more about Pythagoras theorem

brainly.com/question/343682

#SPJ1

3 0

1 year ago