Explanation:
1N=9,81 kg
1. 9,81×500×10=<u>49.050</u>
2. 9,81×100×40=39.240
option 1 does more wor
Explanation:
It is given that,
Distance between wires, d = 3.5 mm = 0.0035 m
Power of light bulb, P = 100 W
Potential difference, V = 120 V
(a) We need to find the force per unit length each wire of the cord exert on the other. It is given by :

Power, P = V × I

This gives, 


(b) Since, the two wires carry equal currents in opposite directions. So, teh force is repulsive.
(c) This force is negligible.
Hence, this is the required solution.
Answer:
planning charts used to schedule resources and allocate time is the correct answer
Explanation:
- Gantt Charts are a project planning tool used to track the projects from the start to endpoint.
- Gantt charts are used for the preparation and planning of the projects.
- By using Gantt charts we can assess how much time a project would take to complete and we can also determine resources required with the help of Gantt charts.
Answer:
a)-2m/s^2
b)27.2m/s
Explanation:
Hello! The first step to solve this problem is to find the mass of the block remembering that the definition of weight force is mass by gravity (g=9.8m / s ^ 2)
W=455N=weight
W=mg
W=455N=weight

The second step is to draw the free body diagram of the body (see attached image) and use Newton's second law that states that the sum of the forces is equal to mass by acceleration

for point b we use the equations of motion with constant acceleration to find the velocity

Where
Vf = final speed
Vo = Initial speed
=0
A = acceleration
=2m/s
X = displacement
=6.8m
Solving

Thiết bị không phải nguồn điện:
Đáp án D