A student lifts their 5 kg backpack 2 meters off the floor. How much work does the student do on the backpack?
1 answer:
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Answer:
1- For the track B. The potential energy is the same for the two cars, but because of the slope of the track, the car B earn kinetic energy faster. The gravitation acceleration of the cars will be g•sinθ, and the angle of the track B will have a bigger value for sinθ
2- The conservation of energy applies because the roller coaster is a closed track. When a car climb the track, it earn GPE, which is given by mgh, when it get down in the track, it transform GPE in KE, which is given in 1/2mv².
3-
Position of car (m) GPE KE GPE + KE
top (30m) 60000 0 60000
bottom (0m) 0 60000 60000
halfway down (15m) 30000 30000 60000
three-quarters way down 15000 45000 60000
The magnitude and direction of the net force is 9 newtons to the right ⇒ answer A
Explanation:
The net force is the vector sum of all the forces that act upon an object
If two forces are horizontal where,
>
- They are in opposite direction
- Net force F =
in the direction of
An object is acted upon by a force of 22 newtons to the right
and a force of 13 newtons to the left
We need to find the magnitude and direction of the net force
→ = 22 newtons to the right
→ = 13 newtons to the left
>
and they are in opposite direction
Substitute these values in the rule of the net force above
→ Net force F = 22 - 13 = 9
→ The direction of the net force is the same direction of the larger
force, the direction of the larger force is to the right
→ Net force is 9 newtons to the right
The magnitude and direction of the net force is 9 newtons to the right
Learn more:
You can learn more about the net force in brainly.com/question/4033012
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