Answer:
Explanation:
First, the box goes from position x=0 to x=x1, so, the work made by the friction is calculated as:
where is the force of friction, the displacement, m the mass, V is the speed in rest and the initial speed.
V is equal to zero, so:
it means that the force of friction is equal to:
On the other hand, when the box goes from position x=x1 to x=x2, the work-energy theorem said that:
Where is the work done by the person.
Then, solving for :
Finally, replacing by , we get:
First it will accelerate with acceleration a = 2.62 m/s^2
now the distance that it will move with this acceleration is
d1 = 0.5 * 2.62 * 12.8^2 = 214.6 m
so it will cover first 241.6 m during acceleration
now it will cover next distance with constant speed
so the distance covered is given as
d2 = v* t
d2 = 33.536 * 0.895*60 = 1800.9 m
after this it will comes to rest by constant deceleration which is given as by a = -11.2 m/s^2
so the distance it will cover is given by
d3 = (v^2 - vi^2)/(2a)
d3 = (0^2 - 33.536^2) / (2*-11.2)
d3 = 50.2 m
so the total distance that it move is given by
d = d1 + d2 + d3
d = 214.6 + 1800.9 + 50.2
d = 2065.7
so the total displacement is 2065.7 m
Answer:
2 and 0.6 ohms = 1.8A
4ohms = 1.08A
6 ohms = 0.72 ohms
Explanation:
With the help of the given diagram calculate the current through each resistor.
According to ohms law
E = IRt
E is the electromotive force = 9V
I is the total current in the circuit
Rt is the total equivalent resistance
Get Rt
1/R = (1/4+1/6) (parallel resistors)
1/R = 3+2/12
1/R = 5/12
R = 12/5
R = 2.4 ohms
Rt = 2 + 0.6 + 2.4
Rt = 5 ohms
Get the total current
I = E/Rt
I = 9/5
I = 1.8A
Since same current flows in a series connected resistors
Current in the 2 and 0.6 ohms resistors will be 1.8A
For the 4 and 6 ohms resistor:
Voltage across them is expressed as:
V = IR
V = 1.8(2.4)
V = 4.32Volts
The current in 4 ohms resistor
I = 4.32/4
I = 1.08A
The current in 6 ohms resistor
I = 4.32/6
I = 0.72A
Answer:
gravitational potenetial energy =ℎ
Explanation:
none
The third law states, all forces between two objects exist in equal magnitude and opposite direction.
for example, If you push against something it puses back against you. Your hand pushes on the table, and the table pushes back just as hard against your hand. If it didn't push back, your hand would go straight through the table.
third law of motion is also known as law of action and reaction.
hope this helps
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