1.27.2014

MCAT Question of the Day - 01.28.14

0 comments
When gases deviate from ideal gas behavior due to temperature, intermolecular attraction forces_________.
  1. become more significant
  2. become less significant
  3. stay the same
  4. do not exist

Choice A is correct! Here's why:

Gasses deviate from ideal behavior at low temperatures. Under these conditions, the average velocity of gas particles slows further and further, thus increasing intermolecular attraction forces.

Return to lesson on Deviation of Real-Gas Behavior from Ideal Gas Law
← Previous Question
Next Question →
Read more...

MCAT Analysis of Pulley Systems Q2

0 comments
An object A has mass of 10kg and B has mass of 25kg. They are connected through a string over a frictionless pulley and placed on frictionless incline with the slope of 45 degree. What is the net force of the object on the incline? (assume gravitational acceleration is 10m/s2).
  1. 71N
  2. 250N
  3. 100N
  4. 179 N

Choice D is correct! Here's why:

Using the equation, Fnet = FT – mgsin(theata), you can find that the net force is 179N.

Return to lesson on Analysis of Pulley Systems
← Previous Question
Return to Q Bank →
Read more...

MCAT Analysis of Pulley Systems Q1

0 comments
In a pulley system, the heavier mass is ____________ by gravitational acceleration, while the lighter mass is _________ due to tension force.
  1. Pushed up, pulled down
  2. Pulled down, pushed up
  3. Both masses are pushed up
  4. Both masses are pulled down

Choice A is correct! Here's why:

The heavier mass is pushed down by gravitational acceleration and the lighter mass experiences the tension force and gets pulled up the pulley.

Return to lesson on Analysis of Pulley Systems
← Return to Q Bank
Next Question →
Read more...

MCAT Tension Force Q2

0 comments
A massless wire is used to load objects. If the load moves up with a constant velocity and the tension in the cable is 2000N, what is the weight of the object? (Assume gravitational acceleration is 10m/s2).
  1. 2000N
  2. 1000N
  3. 200N
  4. 100N

Choice A is correct! Here's why:

Because the load moves up with a constant velocity, there is no gravitational acceleration thus Ft (tension force) equals mass of the object.

Return to lesson on Tension Force
← Previous Question
Return to Q Bank →
Read more...

MCAT Tension Force Q1

0 comments
In response to gravitational force of the hanging object, the string has a force of ___________ magnitude in the _____________ direction.
  1. Equal, same
  2. Equal, opposite
  3. Different, same
  4. Different, opposite

Choice B is correct! Here's why:

Tension force is when the strong has a force of equal magnitude in the opposite direction.

Return to lesson on Tension Force
← Return to Q Bank
Next Question →
Read more...
 
Premed HQ © 2011 DheTemplate.com & Main Blogger .

Disclaimer