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PtichkaEL [24]
2 years ago
13

A helicopter is traveling with a velocity of 12 m/s directly upward.

Physics
1 answer:
Irina-Kira [14]2 years ago
5 0

Answer:

H = 27.35 m

Explanation:

From projectile motion, we know that;

h = (v_o)²/2g

Where;

v_o = 12 m/s

g = 9.8 m/s²

Thus;

h = 12²/(2 × 9.8)

h = 144/19.6

h = 7.35 m

Now, we are told that when the man is 20 m above the pillow, he lets go of

the rope.

Thus, greatest height reached by the man above the ground is;

H = 20 + h

H = = 20 + 7.35

H = 27.35 m

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When we give the speed of a car what frame of reference are we using?
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Frame of reference, in simplest terms, describes the state of motion of the observer. The frame of reference may also be described by using a set of coordinates, time and motion. We formulate all our equations and solve them using the frame of reference.

4 0
3 years ago
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Which of the following statements are true concerning the creation of magnetic fields?
Soloha48 [4]

Answer:

A moving electric charge creates a magnetic field at all points in the surrounding region.

An electric current in a conductor creates a magnetic field at all points in the surrounding region.

A permanent magnet creates a magnetic field at all points in the surrounding region.

Explanation:

Magnetic field can be produced by:

- moving charges (i.e. a moving electron, or a current in a conductor)

- A magnet

The strength of the magnetic field produced by a current-carrying wire is

B=\frac{\mu_0 I}{2\pi r}

where

I is the current

r is the distance from the wire

As we see from the formula, the magnetic field is produced at all points in the surrounding region, because B becomes zero only when r becomes infinite. The same is true for the magnetic field created by a single moving charge or by a magnet.

The following choices instead are not correct:

- A single stationary electric charge creates a magnetic field at all points in the surrounding region.

- A distribution of electric charges at rest creates a magnetic field at all points in the surrounding region.

Because they involve the presence of stationary charges, and stationary charges do not produce magnetic fields.

3 0
3 years ago
In an elastic collision, ________. A. an individual molecule in the collision never loses energy B. the molecules involved in th
Aleks04 [339]

Answer:

Im pretty sure its B im very sorry if its wrong.

3 0
2 years ago
Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. she pl
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Im pretty sure its B independent variable
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2 years ago
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Which object has a greater momentum? 1. A 2500 kg truck moving at 0.01 m/s. 2. A 0.1 kg bullet traveling at 300 m/s. 3. They are
siniylev [52]
<h2>The momentum is greater for  0.1 kg bullet traveling at 300 m/s</h2>

Explanation:

Momentum = Mass x Velocity.

A 2500 kg truck moving at 0.01 m/s

      Momentum = Mass x Velocity

      Momentum = 2500 x 0.01 = 25 kgm/s

A 0.1 kg bullet traveling at 300 m/s

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      Momentum = 0.1 x 300 = 30kgm/s

Momentum of 0.1 kg bullet traveling at 300 m/s > Momentum of 2500 kg truck moving at 0.01 m/s.

The momentum is greater for  0.1 kg bullet traveling at 300 m/s

4 0
2 years ago
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