ADA Practice Exam

[catsomgcats]

---

Members don't see this ad.

For those of you that have done the ADA practice exam and under the answer to all of the questions... Can you please explain to me how to do the following questions on the physics portion?

13. Atmospheric pressure is very nearly 100 kPa. A sealed container of air at 1 atmospheric pressure has a door 1 m wide and 2 m high. This door is very hard to open during HIGH pressure days. If the atmospheric pressure on the outside of the container is just 1 percent greater than on the inside, then what added force in Newtons is required to open the container door?
A. 100
B. 200
C. 2.000
D. 10,000
E. 20,000

(answer: C)

15. A massless rod in the sketch below is free to rotate about an axis through point 0, at the right end of the rod. To maintain equilibrium, which of the following must force F, in Newtons, equal?
A. 20
B. 40
C. 60
D. 100
E. 120

(answer: C) (there's a diagram with this picture... couldn't copy and paste it)

16. A ball is thrown horizontally at 20m/s from the top of a building and strikes the level ground 50 m from the building. Approximately how many meters high is the roof of the building?
A. 12.5 m
B. 24.5 m
C. 31 m
D. 50 m
E. 62 m

(answer: C)

29. . A thin lens produces a virtual image which is smaller than the object. It must be that the
A. object must be inside the focal point of a converging lens.
B. object must be outside the focal point of a converging lens.
C. lens must be a diverging lens.
D. object must be infinitely far from a converging lens.
E. object must be far from the optical axis of a converging lens

(answer: C)


And in the QR section:

36. Maria has a number of dimes and quarters whose total value is less than $9.00. There are twice as many dimes as quarters. At most, how many quarters could she have?
A. 14
B. 15
C. 19
D. 20
E. 35

(answer: C)

Or are they all just "when in doubt go with C" lol

 

[NAUeyes]

13. Pressure=Force/Area Area=2x1=2 Pressure = 100kPa or 100000Pa.... 100000=F/2 F=200000 x .01 (1%) = 2000 N added!

15. You want the Torques to be equal here. T=rF....Torque in first direction is T=(3m)(100N)=300...... Torque in other direction also must be 300...300=(5m)(x). x=60N

16. First find out the time variable. v=d/t 20=50/t t=2.5s then plug into the displacement in the y direction equation for projectile. y=vi*t + 1/2*a*t^2. vi in y direction=0 a=10 t=2.5 y=1/2(10)(2.5)^2= 31.25

29. The key is the word smaller. Converging lenses will only form larger virtual images. So it must be diverging.

36. x=quarters 2x=dimes .25x+.10(2x)=9.00 .25x+.20x=9.00 .45x=9.00 x=20. So 20 quarters and 40 dimes. 20quaters= 5.00 dollars and 40dimes= 4.00 dollars. So she can only have, at most, 19 quarters because the total was less than 9.00 dollars! Any over 19 quarters would produce a total equal to or over 9.00!

Hope this helps!