MCAT practice questions

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MCAT practice questions

Postby goldstandard_mcat » Tue Jun 03, 2014 10:31 am

A student throws a rock at a 60° angle over a lake. The rock leaves his hand at a velocity of 20 m/s. How far away from the student will the rock shadow appear on the ground after 1 second, assuming the shadow projects straight down from the rock?
A) 5 m
B) 7 m
C) 10 m
D) 12 m

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Last edited by goldstandard_mcat on Mon Jul 18, 2016 6:04 am, edited 1 time in total.
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Re: MCAT practice questions

Postby Percival B » Thu Jun 05, 2014 10:14 pm

The real answer would be "insufficient information", because the question does not take into account various physical factors such as wind speed and direction, atmospheric pressure, whether the student is above/below/at the same level as the lake. etc
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Re: MCAT practice questions

Postby goldstandard_mcat » Fri Jun 06, 2014 7:43 am

Answer is C. Because the question asks for the distance between the rock’s shadow and the student, the distance will be a horizontal distance. The horizontal velocity of the rock is given by vx= v•cosθ= v•cos60o= v (1/2). Thus vx=10 m/s. So, distance x is given by x= (vx)(t)= 10 m/s (1s)= 10 m.

goldstandard_mcat wrote:A student throws a rock at a 60° angle over a lake. The rock leaves his hand at a velocity of 20 m/s. How far away from the student will the rock shadow appear on the ground after 1 second, assuming the shadow projects straight down from the rock?
A) 5 m
B) 7 m
C) 10 m
D) 12 m
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Re: MCAT practice questions

Postby goldstandard_mcat » Fri Jun 06, 2014 7:45 am

Which of the following typically have a plasma membrane but no nuclear membrane?
A) Bacteria
B) Bacteriophages
C) Fungi
D) Viruses other than bacteriophages
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Re: MCAT practice questions

Postby Percival B » Sat Jun 07, 2014 7:02 pm

Incorrect.

For example: if the lake is at a different level then the shadow will be a diagonal distance from the student.

You just copied that incorrect answer from a commercial-prep MCAT book or simplistic textbook.
Lots of scientific reasons why you are wrong, and why the question would not be on a real MCAT.

The answer is: your laziness, a poor example of a physics multiple-choice problem, and this calls into question whether you have ever taken a course in the physical sciences.
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