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Serggg [28]
3 years ago
15

A person in a kayak starts paddling, and it accelerates from 0 to 0.65 m/s in a distance of 0.40 m. If the combined mass of the

person and the kayak is 75 kg, what is the magnitude of the net force acting on the kayak?
Physics
1 answer:
SCORPION-xisa [38]3 years ago
6 0

Answer:

Magnitude of the net force acting on the kayak = 39.61 N

Explanation:

Considering motion of kayak:-

Initial velocity, u =  0 m/s

Distance , s = 0.40 m

Final velocity, v = 0.65 m/s

We have equation of motion v² = u² + 2as

Substituting

   v² = u² + 2as

    0.65² = 0² + 2 x a x 0.4

    a = 0.53 m/s²

We have force, F  = ma

Mass, m = 75 kg

    F  = ma = 75 x 0.53 = 39.61 N

Magnitude of the net force acting on the kayak = 39.61 N

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Scrat [10]

Answer:

A = 0.2875 m^2

Explanation:

As we know that

Q = 4.6 \mu C

E = 1.8 kV/mm

now we know that electric field between the plated of capacitor is given as

E = \frac{\sigma}{\epsilon_0}

now we will have

1.8 \times 10^6 = \frac{\sigma}{\epsilon_0}

\sigma = (1.8 \times 10^6)(8.85 \times 10^{-12})

\sigma = 1.6 \times 10^{-5} C/m^2

now we have

\sigma = \frac{Q}{A}

now we have area of the plates of capacitor

A = \frac{Q}{\sigma}

A = \frac{4.6 \times 10^{-6}}{1.6 \times 10^{-5}}

A = 0.2875 m^2

5 0
3 years ago
When released , what is the kinetic energy of the 1c charge of the preceding problem if it flies past its starting position?
Alekssandra [29.7K]
A) When a charge is moved in an electric field the work done (W) is calculated as charge*(change in potential). We can write W = q*V or V = W/q = 10/1 = 10V . This voltage is a difference in electric potential between 2 points within the field. If the charge is positive, and positive work is done upon it, then the final position is more positive than the original one. 

<span>b) If a charge (Q) is released from rest and falls through a potential difference V, then its gain in energy (KE if no other force acts on the charged body) is q*V = 10J. This is the same as the work done in moving the charge to its new position in part (a), and is an example of the conservation of energy.</span>
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There is more land in the Northern Hemisphere than in the Southern Hemisphere. How might this difference affect CO2, concentrati
alexira [117]

Oxygen is a product of photosynthesis, therefor lover levels of C02 would be in the area with more water due to more phtosynthetic processes happening converting it into oxygen.

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5 0
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Two conducting spheres of different sizes are at the same potential. The radius of the larger sphere is four times larger than t
Sergeeva-Olga [200]

Answer:

0.8

Explanation:

The two spheres have the same potential, V.

Let the radius of the larger sphere be R and the radius of the smaller sphere be r,

=> R = 4r

Let the charge on the smaller sphere be q. Hence, the larger sphere will have charge Q - q.

The potential of the smaller sphere will be:

V_S = \frac{kq}{r}

The potential of the larger sphere will be:

V_L = \frac{k(Q - q)}{R}

Inputting R = 4r,

V_L = \frac{k(Q - q)}{4r}

Since V_S = V_L = V,

\frac{k(Q - q)}{4r} = \frac{kq}{r}

=> Q - q = 4q

=> 5q = Q

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The fraction of the charge Q that rests on the smaller sphere is 0.2

The charge of the larger sphere is:

Q - q = Q - 0.2Q = 0.8Q

∴ The fraction of the total charge Q that rests on the larger sphere is 0.8

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A 20 g bullet is shot from a 10 kg gun with a velocity of 400 m/s. What
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Answer: -.80m/s

Explanation:

3 0
3 years ago
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