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# Physics Watch

1. a student apparently weighs 180 lb in an elevator that is accelerating at the rate of 5ft/s^2

a) What is the true weight of the student?
b) What will be the apparent weight of the student when the elevator now decelerates at the rate of 2 ft/s^2?
c) What should be the elevator's acceleration in order for the apparent weight of the student to be equal to 160 lb?
2. (Original post by gervysjedm)
a student apparently weighs 180 lb in an elevator that is accelerating at the rate of 5ft/s^2

a) What is the true weight of the student?
b) What will be the apparent weight of the student when the elevator now decelerates at the rate of 2 ft/s^2?
c) What should be the elevator's acceleration in order for the apparent weight of the student to be equal to 160 lb?
This is some crzy complicated ****!
3. You have not mentioned which way the lift goes, up or down? That will determine what equation to write.
4. Can you help me to solve this problem?
5. A red ball is thrown straight up from the edge of the roof of a building.A green ball is dropped from the same point 1.80 seconds later.
If the height of the building is 60.0 m , what is the initial velocity of the red ball,if both balls are to hit the ground at the same time?
6. Hello,

I was wondering if anyone could help me with drawing an energy transfer flow chart thing for these things (as well as a detailed explanation of the flow chart?).

Here is the information on what I have to do:

Create a handout or poster to show how energy is transferred from one form to another. For each of the following applications create a flow chart to illustrate how energy changes from the initial form to the final form via all intermediary stages. Include a description to explain how the energy is transferred and how energy is wasted.

•An electric powered hoist lifting a packing case off a lorry and then lowering itonto the floor of a warehouse.
•A petrol powered electrical generator providing power for the stage lighting at Glastonbury.
•A seat belt restraining the driver of a car during a traffic accident.
•A battery used to power an MP3 player.
•An electric kettle heating water for a hot drink.
•A coal fired furnace and boiler in a conventional power station, ending with electricity being produced.

It would be a great help if someone could! And thanks in advance!

Ak

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Updated: October 16, 2016
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