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The speed of light in a vacuum is 3*10^8 m/s . The speed of light whitin a particular substance is 1.5 * 10^8 m/s. The index of reflaction of the substance is:
a) 1.0
b) 2.0
c) 2.5
d) 0.5
e) None of these
A spaceship travels with a speed of 0.3 c as it passes by the Earth on its way to a distant star, Determine its length as measured by a person on Earth
The observed frequency of a train whistle is 475Hz as it approaches a stationary observer and is 410Hz as it recedes
A mass m is attached to an ideal cord of length L (figure at left). What is the tension in the cord at that moment
A wheel with a tire mounted on it rotates at the constant rate of 2.59 times a second. A tack is stuck in the tire at distance 31.7 cm from the rotation axis. Noting that for every rotation the tack travels one circumference, find the tack\'s tangent..
A converging lens(f1=4 cm) is located 8 cm to the left of a diverging lens (f2= -2 cm). Find the final image formed by the 2 lens system
The angular position of a point on the rim of a rotating wheel is given by ?=4.0t- 3.0t2 + t3, where ? is in radians if t is given in seconds. What is the instantaneous angular acceleration at the beginning of this time interval
A block slides down a frictionless plane having an inclination of θ = 19.1 °. Find its speed when it reaches the bottom of the incline
A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. Find the smallest value for the angle , such that the lower end of the board does not slide along the ground
A solid cylinder is mounted above the ground with its axis of rotation oriented horizontally. How much of the rope unwinds in this time interval
A 0.10kg solid rubber ball is attached to the end of a 0.80 m length of light thread. The ball is swung in a vertical circle. Point p, the lowest point of the circle, is 0.20 m above the floor.
What is the density of Neon gas at standard temperature and pressure? The atomic mass of Neon is 20.18 atomic mass unit
A dentist uses a mirror to examine a tooth that is 0.75 cm in front of the mirror. The image of the tooth is formed 14.0 cm behind the mirror. Determine the magnification of the image
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