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Open Question: Need Help on some physics problems?
I need some help with some physics problems: 1) An 859 kg (1898 lb) dragster, starting from rest, attains a speed of 26.9 m/s (60.3 mph) in 0.59 s. (a) Find the average acceleration of the dragster during this time interval. (b) What is the magnitude of the average net force on the dragster during this time? (c) Assume that the driver has a mass of 68 kg. What horizontal force does the seat exert on the driver? ------------------------------------------------------------------------------------------------ 2) After a day of testing race cars, you decide to take your own 1590 kg car onto the test track. While moving down the track at 10.0 m/s, you uniformly accelerate to 26.0 m/s in 10 s. What is the average net force that you have applied to the car during the 10 s interval? -------------------------------------------------------------------------------------------- 3) A 4560 kg helicopter accelerates upward at 2.0 m/s2. What lift force is exerted by the air on the propellers? ------------------------------------------------------------------------------------------------- 4) The maximum force a grocery sack can withstand and not rip is 255 N. If 18.5 kg of groceries are lifted from the floor to the table with an acceleration of 5.0 m/s2, will the sack hold? (a) Give the force exerted on the bag, to justify your answer. ----------------------------------------------------------------------------------------------------- 5) A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 823 N. (a) As the elevator moves up, the scale reading increases to 910 N, then decreases back to 823 N. Find the acceleration of the elevator. (b) As the elevator approaches the 74th floor, the scale reading drops to 782 N. What is the acceleration of the elevator? (d) What changes would you expect in the scale readings on the ride back down? ------------------------------------------------------------------------------------------------------ 6) If you use a horizontal force of 34.0 N to slide a 13.5 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor? ------------------------------------------------------------------------------------------------- 7) A sled of mass 55.0 kg is pulled along flat, snow-covered ground. The static friction coefficient is 0.30, and the kinetic friction coefficient is 0.10. (a) What does the sled weigh? (b) What force will be needed to start the sled moving? (c) What force is needed to keep the sled moving at a constant velocity? (d) Once moving, what total force must be applied to the sled to accelerate it at 3.2 m/s2?
Open Question: how do you know if a car went backwards under cover in the 27th century before christmas time in a dark alley?

Open Question: What would you do in my situation? Serious answers only please...?
Ok, it all started in June. I got sick, and in August lost my job. I'm currently collecting unemployment and looking for a job. I live with my boyfriend and we got behind on our rent because I was sick and he couldn't make enough to support both of us. We are JUST NOW starting to catch up on everything. We owed $866 in rent, and we paid $775 because she said as long as it was under $100 that we owed we would be ok. Well the bitch sent it to collections, and now they are asking for $357 in fees, and possession of the house in December. On top of THAT, the transmission in my car went out, and we only have 1 car! We are still broke because while the unemployment helps, its not enough to cover EVERYTHING. Plus now we need to find a new apartment, and nobody will rent because we have very little credit, and now we are going to have bad rental history! I am so stressed out right now that I don't know what to do. We need a new house, car, and I need a new job, which I have been searching for and cannot find one in this economy. What the hell can I do to regain control and get my life back? I am at my wit's end. Please don't be mean about this.

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