**Answer:**

**(i)** , **(ii)** , **(iii)**

**Explanation:**

**(i)** and represent the points where particle has a velocity of zero and spring reach maximum deformation, Given the absence of non-conservative force and by the Principle of Energy Conservation, the position where particle is at maximum speed is average of both extreme positions:

**(ii)** Maximum accelerations is reached at and .

**(iii)** Greatest net forces exerted on the particle are reached at and .

**Answer:**

**Explanation:**

The capacitance of a parallel plate capacitor is given by:

(1)

where

is the vacuum permittivity

A is the area of the plates

d is the separation between the plates

The charge stored on the capacitor is given by

(2)

where C is the capacitance and V is the voltage across the capacitor.

The displacement current in the capacitor is given by

(3)

where t is the time elapsed

Substituting (1) and (2) into (3), we find an expression for the displacement current:

where we have

Substituting into the equation, we find

1.) The force of gravity is what we call weight, we define it as:

w=mg

w=5,7kg*9,8m/s²

w=55,86kg (b)

2.) We know that:

power=W/t

power=50J/20s

power=2,5Watts (a)

3.) The work done is equal to the potential energy, so:

Epg=mgh

Epg=63kg*9,8m/s²*7m

Epg=4321J

Now we get the power:

power=W/t

power=4321J/5s

power=864Watts

Now:

1HP=746Watts

=1,16HP (b)

4.) We know that:

F=ma

350N=m*10m/s²

m=350N/10m/s²

m=35kg (b)

5.) d.) Aceleration is tha rate of change in velocity, either positive (increasing) or negative (decreasing)

The** first law states that the** internal **energy c**hange of that system is given by **Q − W** . Since added heat increases the internal **energy** of a system, **Q **is positive when added to the system and negative when removed from the system.

The distance covered in one orbit is equal to the circumference of earth.

Given that radius of earth is 3959 miles.

Circumference of earth= 2πr = 2*3.14*3959 = 24875.13 miles

Speed is 26,000 miles per hour.

Since, Velocity= Distance/Time

Time= Distance/Velocity = 24875.13/26000

Time = 0.9567 hours

Therefore,

Average hour per orbit is 0.957 approximately.