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3 years ago

Can Someone help me answer the question?

Physics

1 answer:

soldi70 [24.7K]3 years ago

8 0

There must be a description of the ball and its environment,
somewhere earlier on the sheet where we can't see it. We
don't know what the conditions and environment are around
the ball as it moves downward. So I can only answer in the
most general way, and make up some scenarios.

If the ball is falling from an airplane, then it has to use some
of its energy to push air out of the way, and even then, it loses
some more energy as the air molecules scrape against its side.
This is all called 'air resistance'. It's a form of friction, the form that
takes energy away from anything that's moving through air.

If the ball is rolling across the lawn, then it takes some energy
to bend the blades of grass down along its path. That's why a
ball that's rolling anywhere on Earth always stops, although
Newton's laws of motion say that an object in motion always
keeps moving and doesn't stop.

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Two high-current transmission lines carry currents of 29.0 A and 78.0 A in the same direction and are suspended parallel to each

jarptica [38.1K]

Answer with Explanation:

We are given that

$I_1=29 A$

$I_2=78 A$

$d=38 cm=\frac{38}{100}=0.38 m$

$1 m=100 cm$

a.Length of segment,l=20 m

Magnetic force ,F= $\frac{2\mu_0I_1I_2 l}{4\pi d}$

$\frac{\mu_0}{4\pi}=10^{-7}$

Substitute the values

$F=\frac{10^{-7}\times 29\times 78\times 20}{0.38}=0.0119 N$

Hence, the magnetic force exert by each segment on the other=0.0119 N

b.We know that when current carrying in the wires are in same direction then the force will attract to each other.

Hence, the force will be attractive.

4 0

3 years ago

Read 2 more answers

What is the force on a box that is being pushed to the right with 50n of force while, at the same time, being pushed to the left

elena-s [515]

I think the question meant to say net force on the box. Since force is a vector, the direction matters. 20N left is negated completely by the 50N right, which means the net force is 50N-20N to the right, 30N.

7 0

3 years ago

A uniform, solid sphere of radius 2.50 cm and mass 4.75 kg starts with a purely translational speed of 3.00 m/s at the top of an

allsm [11]

Answer:

The final translational seed at the bottom of the ramp is approximately 4.84 m/s

Explanation:

The given parameters are;

The radius of the sphere, R = 2.50 cm

The mass of the sphere, m = 4.75 kg

The translational speed at the top of the inclined plane, v = 3.00 m/s

The length of the inclined plane, l = 2.75 m

The angle at which the plane is tilted, θ = 22.0°

We have;

$K_i$ + $U_i$ = $K_f$ + $U_f$

K = (1/2)×m×v²×(1 + I/(m·r²))

I = (2/5)·m·r²

K = (1/2)×m×v²×(1 + 2/5) = 7/10 × m×v²

U = m·g·h

h = l×sin(θ)

h = 2.75×sin(22.0°)

∴ 7/10×4.75×3.00² + 4.75×9.81×2.75×sin(22.0°) = 7/10 × 4.75× $v_f$ ² + 0

7/10×4.75×3.00² + 4.75×9.81×2.75×sin(22.0°) ≈ 77.93

∴ 77.93 ≈ 7/10 × 4.75× $v_f$ ²

$v_f$ ² = 77.93/(7/10 × 4.75)

$v_f$ ≈ √(77.93/(7/10 × 4.75)) ≈ 4.84

The final translational seed at the bottom of the ramp, $v_f$ ≈ 4.84 m/s.

3 0

3 years ago

The temperature of a superconductor is gradually lowered. At the critical temperature, how does the resistivity of the supercond

san4es73 [151]

At critical temperature, the resistivity of the superconductor

B. It suddenly drops to zero

Explanation:

Materials can be classified into three different types depending on their resistance:

Conductors: these materials have generally low resistance and allow electricity to pass through easily. The resistance of a conductor increases linearly with the temperature
Insulators: these materials do not allow electricity to pass through - so they have very high resistance
Semi-conductors: these are materials that are insulators are room temperature, however they becomes conductors when heated. Therefore, the resistance of a semiconductor decreases when the temperature increases
Superconductors: these are special materials that are normally conductors; however, at very low temperatures (we are talking about temperature very near to 0 K), their resistance becomes suddenly zero.

Therefore, the correct answer is:

B. It suddenly drops to zero

Learn more about current and resistance:

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8 0

3 years ago

Prior to the Panama Canal, __________ was a major route between the Atlantic and Pacific oceans.

Bingel [31]

The Rio Grande was the major route prior to the Panama Canal.