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3 years ago

When an object moves, stops moving, changes speed, or changes direction, how do scientists describe that condition?

Physics

2 answers:

FromTheMoon [43]3 years ago

8 0

Those are all "acceleration", caused by
unbalanced forces acting on the object.

dalvyx [7]3 years ago

8 0

The correct answer to this question is D) Unbalanced forces.

EXPLANATION:

From Newton's first laws of motion, we know that everybody continues to be at state of rest or of uniform motion in a straight line unless and until, it is compelled by some external unbalanced forces acting on it.

Hence, it is the unbalanced force which is responsible for creating the motion in a body, changing the direction of motion or speed of the body.

No balanced force can change the state of the body. The body will be either in dynamic equilibrium or in static equilibrium due to the balanced forces.

Hence, the correct option of this question is unbalanced forces.

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Why don't the present shapes of the continents fit perfectly into the supercontinent?

kirza4 [7]

<span>The reason why the shapes of the continents as of today do not perfectly fi into to super continent because long time ago the super continent was scattered into pieces. And as times go by, those smaller parts of super continents undergo soil erosion caused by the water and other way that causes their original shapes change.
Thus, if we are going to judge now if those smaller part of super continent, they’re no longer gonna fit perfectly because through time their original form changed</span>

7 0

4 years ago

A circular coil of radius 5.0 cm and resistance 0.20 Ω is placed in a uniform magnetic field perpendicular to the plane of the c

DedPeter [7]

Answer:

The induced current in the coil at the time 2 s is 0.00263 A

Explanation:

The equation for induced emf is equal to:

$\epsilon =-\frac{d}{dt} (BAcos\theta )$

Where

B = magnetic field

A = area

θ = angle

$\epsilon =-Acos0\frac{d}{dt} B\\\epsilon =-(\pi r^{2} )\frac{d}{dt} (0.5e^{-0.2t} )\\\epsilon =0.1 (\pi r^{2} )e^{-0.2t}$

For t = 2 s

$\epsilon =0.1*\pi *0.05^{2} *e^{-0.2*2} =5.26x10^{-4} V$

The induced current is:

$I=\frac{\epsilo }{R} =\frac{5.26x10^{-4} }{0.2} =0.00263A$

3 0

3 years ago

two pulleys one with adius 2 inches and the other with radius 8 inches are connected by a belt. If the 2 inch pulley is caused t

White raven [17]

Explanation:

we know that,

linear speed = circumference × revolution per minute

linear speed of belt = 2πr × revolution per minute

now we will compute the linear speed of a belt for 2 inch pulley that is,

linear speed for 2 inch pulley = (2π×2)×( 3 revolutions per minute) ∵ r =2

= 4π × 3 revolution per minute (1)

again we will compute the linear speed of a belt for 8 inch pulley,

linear speed of 8 inch pulley = (2π×8) × (x revolution per minute) ∵ r =8

= 16π×x revolutions per minute (2)

As the linear speed is same for both pulleys. by comparing equations (1) and (2).

4π×3 = 16π×x

x = 3/4

Thus, the revolutions per minute for the 8 inch pulley is 3/4.

6 0

3 years ago

A radio transfers 270 j of energy electrically, 94.5 j is transferred by sound. Work out the efficiency of this radio. Give your

MakcuM [25]

Answer:

35%

Explanation:

Given data

Amount of energy transferred (Input) = 270J

Amount of energy converted to sound (Output)= 94.5J

Efficiency = output/input*100

Efficiency= 94.5/270*100

Efficiency=0.35*100

Efficiency=35%

Hence the efficiency is 35%

6 0

3 years ago

A 480 g peregrine falcon reaches a speed of 75 m/s in a vertical dive called a stoop. If we assume that the falcon speeds up und

Svet_ta [14]

The minimum height of the dive needed to achieve the given speed is v = 69 m/s is 242.9 m.

Given information:

The mass of peregrine falcon is, m = 480

The final speed reached by the peregrine falcon in a vertical dive is, v = 69 m/s

It is given that the falcon is diving vertically downward. It can be compared with the same situation as the free-falling object under the effect of gravity only. So, the initial velocity of the falcon will be u = 0 m/s as the motion starts with rest.

The value of the gravitational acceleration of gravity is, g = 9.80 m/s²

Now, using the third equation of motion, the minimum height required for the final speed will be,

v² - u² = 2gh

69² - 0² = 2 × 9.8 × h

h = 242.9m.

Therefore, the minimum height of the dive needed to achieve the given speed is 242.9 m.

Learn more about falcon speeds at

brainly.com/question/12449855

#SPJ4

6 0

2 years ago