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3 years ago

Which statement best compares the accelerations of two objects in free fall?

2 answers:

3 0

Answer: option D). The objects have the same acceleration.

The acceleration of both objects is g (acceleration of gravity).

In freefall the only force acting is the attraction of the earth (gravity). There is not air resistance.The acceleration is not dependent either of the mass or the surface area of the object.

Dennis_Churaev [7]3 years ago

3 0

The answer is: D) The objects have the same acceleration.

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Two arrows are fired horizontally with the same speed of

Fed [463]

Answer:

Explanation:

Given

mass of each arrow=0.1 kg

velocity of arrow=30 m/s

One arrow is fired u=due to east and another towards south

Momentum of first arrow

$P_1=0.1\left ( 30\hat{i}\right )=3\hat{i}$

$P_2=0.1\left ( -30\hat{j}\right )=-3\hat{j}$

Total momentum P

$P=P_1+P_2$

$P=3\hat{i}-3\hat{j}$

magnitude $|P|=\sqrt{3^2+3^2}=3\sqrt{2}$

direction

$tan\theta =\frac{-3}{3}$

$\theta =45^{\circ}$ clockwise w.r.t to east

6 0

3 years ago

A duck floating on a lake oscillates up and down

slega [8]

<span>The answer is (2) 0.50 Hz. The frequency (f) of oscillation is the number of oscillations (n) per time (t) in seconds: f = n/t. A duck floating on a lake oscillates up and down 5.0 times (n = 5.0) during a 10.-second interval (t = 10.0 s). So, the frequency of duck's oscillations is: f = 5.0/10.0 s = 0.50 1/s = 0.50 Hz.Hope I helped! :) Cheers!</span>

8 0

3 years ago

A 25.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 21.00 m. When she is partway do

____ [38]

Answer:

The mechanical energy lost due to friction is 2,424.5 J

Explanation:

Given;

mass of the child, m = 25 kg

intial velocity of the child, u = 0

final velocity of the child, v = 7.8 m/s

initial position of the child, h₁ = 21 m

final position of the child, h₂ = 8 m

Let the energy lost due to heat = ΔE

ΔE + ΔK.E + ΔP.E = 0

ΔE + ¹/₂m(v² - u²) + mg(h₂ - h₁) = 0

ΔE + ¹/₂ x 25(7.8² - 0) + 25 x 9.8(8 - 21) = 0

ΔE + 760.5 J - 3185 J =

ΔE - 2,424.5 J = 0

ΔE = 2,424.5 J

Therefore, the mechanical energy lost due to friction is 2,424.5 J

4 0

3 years ago

Can a constant magnetic field set into motion an electron initially at rest? Explain your answer.

Vinvika [58]

No, a constant magnetic field cannot set an electron initially at rest into motion

A force that accelerates a particle is necessary to change its velocity. The magnetic force is inversely proportional to the particle's speed. There cannot be a magnetic force acting on a moving particle, according to Einstein. A flux is a precise description of the greater-than-unity magnetic determine involving energy currents and magnet resources. The magnetic flux in a stage is actually selected apart from each some sort of route and also a degree (or durability); therefore, it is just a vector industry. The magnetic flux is usually defined as the Lorentz force that acts on moving galvanic costs.

To know more about Lorentz force refer to brainly.com/question/15552911

#SPJ4

5 0

2 years ago

Please answer this soon

OverLord2011 [107]

Answer:

lava plateau-material fills in valleys

caldera goes-bowl shaped depression

volcanic soil-rich in nutrients

shield volcano-wide summit, gentle slope

cinder cone-made of pieces of lava

Explanation:

3 0

3 years ago