Meg walks 2 m from her desk to the teacher's desk. From the teacher's desk, she then walks 4 m in the opposite direction to the
classroom door. Which table correctly represents both the distance and displacement of Meg's motion?
2 answers:
Answer:
Distance: 6 m
Displacement: 2 meter to the left
Explanation:
In the picture attached, a representation of the problem is shown.
The distance traveled by Meg is the addition of the first 2 meters from her desk to the teacher's desk and the 4 meters from the teachers desk to the classroom door. That makes a total of 2 m + 4 m = 6 meters.
The displacement made by Meg, taking her desk as a reference, is 2 meters to the left because that is the distance between her desk and the classroom door (see the picture).
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Answer:
Net force will be 4.875 N
Explanation:
We have given mass of the cart m = 1.5 kg
Initial velocity of the cart = 0.2 m/sec
And final velocity of the car = - 0.125 m/sec ( Negative direction is due to opposite direction )
Instant of time
Change in momentum is given by
Now force is given by
Net force will be 4.875 N
Answer:
T = 188.5 s, correct is C
Explanation:
This problem must be worked on using conservation of angular momentum. We define the system as formed by the fan and the paper, as the system is isolated, the moment is conserved
initial instant. Before the crash
L₀ = r m v₀ + I₀ w₀
the angular speed of the fan is zero w₀ = 0
final instant. After the crash
L_f = I₀ w + m r v
L₀ = L_f
m r v₀ = I₀ w + m r v
angular and linear velocity are related
v = r w
w = v / r
m r v₀ = I₀ v / r + m r v
m r v₀ = (I₀ / r + mr) v
v =
let's calculate
v =
v =
v = 0.02 m / s
To calculate the time of a complete revolution we can use the kinematics relations of uniform motion
v = x / T
T = x / v
the distance of a circle with radius r = 0.6 m
x = 2π r
we substitute
T = 2π r / v
let's calculate
T = 2π 0.6/0.02
T = 188.5 s
reduce
t = 188.5 s ( 1 min/60 s) = 3.13 min
correct is C
Explanation:
Given that,
Electric field = 5750 N/C
Charge
Distance = 5.50 cm
(a). When the charge is moved in the positive x- direction
We need to calculate the change in electric potential energy
Using formula of electric potential energy
Put the value into the formula
The change in electric potential energy is
(b). When the charge is moved in the negative x- direction
We need to calculate the change in electric potential energy
Using formula of electric potential energy
Put the value into the formula
The change in electric potential energy is
Hence, This is the required solution.