Physics MCAT Review. Larry Watson 105 Witmer Hall 777-3525 [email protected] Web sites www.und.nodak.edu/instruct/lwatson/211 www.und.nodak.edu/instruct/lwatson/212 www.und.nodak.edu/instruct/lwatson/mcat. Goal: Maximize Scores. For Success - Reasoning!!!
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Q 76Starting from a resting position at the left end of the railgun, the armature applies a constant force of 3.0 N to a projectile with a mass of 0.06 kg. How long will it take for the projectile to move 1.0 m?
Q 78For a given mass, if the current were decreased by a factor of 2, the exit speed would:
Q 79If a projectile leaves a railgun near the surface of Earth with a speed of 2.0 km/s horizontally, how far will it fall in 0.01 s?
Q 80If a projectile with a mass of 0.1 kg accelerates from a resting position to a speed of 10 m/s in 2 sec, what is the average power supplied by the railgun to the projectile?
Q 90Two charged particles are a distance r apart. If the charges on the two particles and the distance between the particles are doubled, how does the force between the particles change?
Q 96The glass that is used as a beam splitter is replaced with glass that is identical except that it has a 10% higher index of refraction. Which of the following changes will occur to the pinhole image?
Q 97What is the approximate number of wavelengths of light that can travel in one direction within a retro- reflecting bead that has a diameter of 5 x 10-5 m? (Note: The speed of light is 3 x 108 m/s, and its frequency is approximately 1015 Hz.)
Q 98If a single-wavelength laser is used in place of the light source and pinhole, how will the image on the viewing screen change?
Q 99With the screen removed, an observer at Point A sees a virtual image of the pinhole. Which of the following indicates that the observer is viewing a virtual image?
Q 113When a downward force is applied at a point 0.06 m to the left of a fulcrum, equilibrium is obtained by placing a mass of 10-7 kg at a point 0.40 m to the right of the fulcrum. What is the magnitude of the downward force?
Q 115A 0.5 kg ball accelerates from rest at 10 m/s2 for 2 sec. It then collides with and sticks to a 1.0 kg ball that is initially at rest. After the collision, approximately how fast are the balls going?
Q 117A vertically oriented spring is stretched by 0.15 m when a 100 g mass is suspended from it. What is the approximate spring constant of the spring?
Q 135Which of the following statements as(are) true about the kinetic energy of the projectile when it returns to the elevation from which it was launched?
I. It is the same as when as when it was launched.
II. It is dependent on the initial velocity.
III. It is dependent on the value of p.
Q 136What is the approximate total energy of the projectile at the highest point in its path? (Note: Assume the the effects of air resistance are negligible.)
Q 138What is the magnitude of the horizontal component of the air resistance on the projectile at any point during flight? (Note: vx = horizontal speed.)