Elevator and mass of a student help

In summary, a student weighing 735 N steps into an elevator and accelerates at 3.5 m/s2 for 3.0 s. Using the formula f=ma and the value of 735 N, the mass of the student can be calculated to be 75 kg. It is important to get used to using Newtons in physics, as they are a commonly used unit of force. However, if needed, the weight of 165 pounds can be used to calculate the mass. It is also noted that mass does not change when on an elevator.
  • #1
dance_sg
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1)A student weighing 735 N steps into an elevator and pushes the button to go up. If the elevator accelerates at 3.5 m/s2 for 3.0 s, what is the mass of the student during this time?



2)f=ma, v=d/t



3)i don't quite understand how the student can weigh 735 N and consequently I'm completely lost on this question.
 
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  • #2


Well, do you know what a Newton is? It's a unit of force, like a pound. Saying that a student weighs 735 N is the same as saying that the student weighs 165 pounds. (One pound is equal to about 4.45 Newtons; this is a value you can look up.)

If it helps you solve this problem, use the weight of 165 pounds to figure out the student's mass. But if you do, you should probably go back and do it again without converting the student's weight into pounds. Get used to Newtons, because as long as you're doing physics, you're going to see them a lot.
 
  • #3


Was that really the question? If the student weighs 735 N, then use F= mg so m= F/g= 735/9.81 to find the mass. Mass doesn't change if you are on an elevator.

IF the problem said that his weight on the elevator was 735 N, then you could use 735= m(9.81+ 3.5) to find his mass.
 
  • #4


thank you both of you! :D
 

1. How does the mass of a student affect the operation of an elevator?

The mass of a student affects the operation of an elevator by determining the amount of force needed to lift or lower the elevator. The heavier the student, the more force is required to move the elevator, which can result in slower operation or even malfunctions.

2. Can a student's weight cause an elevator to become stuck?

Yes, a student's weight can potentially cause an elevator to become stuck. If the elevator is already at or near its weight capacity and a student who is significantly heavier enters, the elevator may become stuck between floors and require maintenance to fix.

3. How does the number of students in an elevator affect its weight and operation?

The number of students in an elevator can greatly affect its weight and operation. Each student adds to the total weight of the elevator, which can impact its speed and efficiency. Additionally, having too many students in the elevator can also exceed its weight capacity and cause it to become stuck or malfunction.

4. Is there a maximum weight limit for elevators?

Yes, there is a maximum weight limit for elevators that is determined by the elevator manufacturer. This weight limit takes into consideration the weight of the elevator itself, as well as the weight of the students and any other objects inside. It is important to adhere to this weight limit for the safety and proper functioning of the elevator.

5. Can the mass of a student affect the energy consumption of an elevator?

Yes, the mass of a student can affect the energy consumption of an elevator. The heavier the student, the more energy is required to move the elevator, which can result in higher energy costs for the building. This is one of the reasons why it is important to evenly distribute weight in an elevator to prevent overloading.

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