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Alenkinab [10]
3 years ago
9

A ship is travelling due east at 30 km/hr and a boy runs across the deck

Physics
1 answer:
dsp733 years ago
8 0

Answer:

Vr = 20 [km/h]

Explanation:

In order to solve this problem, we have to add the relative velocities. We must remember that velocity is a vector, therefore it has magnitude and direction. We will take the sea as the reference measurement level.

Let's take the direction of the ship as positive. Therefore the boy moves in the opposite direction (Negative) to the reference level (the sea).

V_{r}=30-10\\V_{r}=20 [km/h]

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A potential difference of 3.27 nV is set up across a 2.16 cm length of copper wire that has a radius of 2.33 mm. How much charge
miskamm [114]

Answer:

Charge = 4.9096 x 10⁻⁷ C

Explanation:

First, we find the resistance of the copper wire.

R = ρL/A

where,

R = resistance = ?

ρ = resistivity of copper = 1.69 x 10⁻⁸ Ω.m

L = Length of wire = 2.16 cm = 0.0216 m

A = Cross-sectional area of wire = πr² = π(0.00233 m)² = 1.7 x 10⁻⁵ m²

Therefore,

R = (1.69 x 10⁻⁸ Ω.m)(0.0216 m)/(1.7 x 10⁻⁵ m²)

R = 2.14 x 10⁻⁵ Ω

Now, we find the current from Ohm's Law:

V =IR

I = V/R

I = 3.27 x 10⁻⁹ V/2.14 x 10⁻⁵ Ω

I = 1.52 x 10⁻⁴ A

Now, for the charge:

I = Charge/Time

Charge = (I)(Time)

Charge = (1.52 x 10⁻⁴ A)(3.23 x 10⁻³ s)

<u>Charge = 4.9096 x 10⁻⁷ C</u>

8 0
4 years ago
Label the parts of the brain. medulla oblongata thalamus cerebrum cerebellum brain stem pons hypothalamus midbrain
Stella [2.4K]

Answer:

Medulla oblongata is lower part of brain.

Cerebrum and cerebellum are the upper hemispheres of the brain.

Explanation:

Cerebrum is the largest part of the brain and is composed of right and left hemispheres.

Cerebellum is the part of brain that lies inside the cerebellum.

Medulla Oblongata is lowest part of brain stem which is most vital part of the brain.

Thalamus is a small region of the brain located above the brain stem. Its main function is to transmit sensory signals to cerebral cortex.

Brain stem act as relay center connecting the cerebrum and cerebellum to the spinal chord.

Hypothalamus is the mid brain located near the pituitary glands. It is very small region of the brain but it plays an important role in maintaining the body temperature and releasing the hormones.

5 0
3 years ago
If you push a crate horizontally with 100 N across a 10 m factory floor and the friction between the crate and the floor is a st
erik [133]

Answer:

300 J

Explanation:

First of all, we need to calculate the net force acting on the crate, which is given by:

F_{net} = F-F_f

where

F = 100 N is the horizontal push

F_f = 70 N is the force of friction

Substituting,

F_{net}=100 - 70 = 30 N

Now we can calculate the net work done on the crate:

W=F_{net}d

where

d = 10 m is the displacement

Substituting,

W=(30)(10)=300 J

According to the work-energy theorem, the kinetic energy gained by the crate is equal to the work done on it: therefore, the answer is 300 J.

4 0
3 years ago
Why does the Rose advise Alice to go in the opposite direction?
Oliga [24]

Answer:

It’s is A

because the opposite direction will take her to the Red Queen

Explanation

8 0
3 years ago
Read 2 more answers
when preparing for a climb, many climbers will measure the air pressure at the highest altitudes to which they will be climbing.
dmitriy555 [2]

Answer: Because even at high altitudes there is still plenty of oxygen for breathing. However, pressure is what drives the oxygen into the blood stream. At lower pressure we aren't able to breath because the pressure is not high enough to get the O2 into the blood.

Explanation:

7 0
3 years ago
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