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Meghana G.
523 MCAT, tutor for 7 years
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MCAT
TutorMe
Question:

What is the best strategy for handling the CARS section passages on the MCAT?

Meghana G.
Answer:

While each student's strategy should be fine-tuned to work best for them, in general, making a few notes about the main points of each paragraph in a CARS passage often proves helpful to make sure you understand the passage and in quickly referencing the relevant sections when answering the questions. I also suggest that reading the passage before reading the questions saves time and produces better results.

Java Programming
TutorMe
Question:

Explain the following method signature: public static void main(String args[])

Meghana G.
Answer:

public: known as the access modifier, this specifies the visibility of the method. A medthod marked as public is visible to all other classes. static: This marks the method as a class method, which means that the method can be called even without a specific instance of the class. void: All methods in Java must declare their return type. Void denotes that the method is not expected to return anything. main: the name of the method. In java, execution begins with the main method. String args[]: the parameter passed to the main method.

Physics
TutorMe
Question:

A 10 kg ball is launched at at 30 degree angle from a height of 100 m. If the ball reaches its maximum height 3 seconds after it was launched, what speed was the ball originally launched at? Assume negligible air resistance.

Meghana G.
Answer:

The mass of the ball is irrelevant, as all objects fall at the same rate (g = 9.8m/s^2). A ball launched at an angle follows a parabolic path. Thus, at the maximum height, the vertical velocity is 0. We know that it took 3 seconds for the vertical velocity to become 0, at that the acceleration was -g the entire time (only gravity acts on the ball once it has been launched). Therefore, the initial vertical velocity must be 3*g = 29.4 m/s. To find the initial velocity (the vector representing both horizontal and vertical components combined), we use trigonometry. The magnitude of the velocity is 29.4/sin(30).

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