We know from Newtons law of force that
Work done = Force * Distance moved
We know from the question that
Force applied = 70 Newton
Distance moved = 9 meters.
Since the object is moving in the same direction as the force applied
So
Work done = Force * Distance moved
= 70 * 9 newton meters(Nm)
= 630 newton meters(Nm)
= 630 joules
How far it moves over a certain period of time, but unlike the term "speed" velocity is a vector quantity and tells you the direction of an object (speed is also distance over time just without a direction). This means an object can have negative velocity, but it can't have negative speed.
(a) The electrical resistance of the wire is determined as 9.27 x 10⁻⁴ ohms.
(b) The current flowing through the wire is 1.1 mA.
<h3>
Electrical resistance of the wire</h3>
The electrical resistance of the wire is determined as follows;
ρ = RA/l
RA = ρL
R = ρL/A
Where;
- A is area of the iron bar
- ρ is electrical resistivity = 1/conductivity = 1/1.0299 x 10⁷ = 9.7 x 10⁻⁸
A = πd²/4
A = π x (0.02)²/4
A = 3.14 x 10⁻⁴ m²
R = (9.7 x 10⁻⁸ x 3)/(3.14 x 10⁻⁴)
R = 9.27 x 10⁻⁴ ohms
<h3>From the chart, voltage after 120 minutes ≈ 1.1 V</h3>
Current, I = V/R
where;
I = 1.1/(1000)
I = 1.1 mA
Learn more about resistance here: brainly.com/question/17563681
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Answer:
acceleration a = 1.04 m/s2
Explanation:
Assume the train has a speed of 23m/s when the last car passes the railway workers. Once this happens the last car would have traveled a total distance of the 180m distance between the railway worker standing 180 m from where the front of the train started plus the 75m distance from the first car to the last car:
s = 75 + 180 = 255 m
We can use the following equation of motion to find out the distance traveled by the car:
where v = 23 m/s is the velocity of the car when it passes the worker, = 0m/s is the initial velocity of the car when it starts, a m/s2 is the acceleration, which we are looking for.