Dimos Quiz
Physics Challenge Quiz
Test your knowledge with our Physics Challenge Quiz! This quiz comprises ten thought-provoking questions designed to challenge your understanding of fundamental physics concepts in a fun and engaging way.
Whether you're a student looking to reinforce your learning or an enthusiast eager to tackle some physics problems, this quiz is perfect for you. Get ready to explore:
- Kinematics
- Thermodynamics
- Electromagnetism
- Fluid Mechanics
- Modern Physics
1) A block is allowed to slide down a friction-less track freely under gravity. The track ends in a circular loop of radius R = 2m. Calculate the minimum height h from which the block must start to complete the circular track. Round your answer to 1 decimal. Give your answer in meters.
2) The distance between the center of carbon and oxygen atoms in CO molecule is 1.13 Å. Calculate the center of mass of the molecule relative to the carbon atom. Give your answer in Angstrom, rounded to two decimals.
3) Two trains move towards each other at a speed of 90 km/h relative to the earth’s surface. One gives a 520 Hz signal. Find the frequency heard by the observer on the other train. Assume that the velocity of sound is v = 350 m/s. Round your answer to one decimal. Give your answer in Hz.
4) A particle is placed at the highest point of a smooth sphere of radius R and is given an infinitesimal displacement. Calculate the obtuse angle θ between the starting point and the point where the particle leaves the sphere, let the vertex of the angle be the center of the sphere. Round your answer up to 2 decimals. Give your answer in degrees.
5) Assume a thin circular disc of uniform density is of radius R = 3m. A circular hole of radius ½R is cut from the disc and touching the disc’s circumference as in the following figure. Find the x coordinate of the center of mass, given that the center of the circle with radius R is at O(0,0).Also assume that C(R/2,0). Give your answer in centimeters. Round your answer up to 1 decimal.
6) Water flows in a horizontal circular pipe of varying cross-section. Two manometer tubes fixed on the pipe, at sections A1 and A2 , where the diameter of the pipe is d1 = 10cm and d2 = 20cm accordingly, indicate a difference Δh = 20cm in the water columns. Calculate the rate of flow of water in the pipe. Assume that g = 9.81 m/s^2. Give your answer in cm^3/s. Round your answer in one decimal.
7) Entropy may decrease locally at some region within the isolated system. How can this statement be justified?
This cannot be possible
This is possible because entropy of an isolated system can decrease
It must be compensated by a greater increase of entropy somewhere within the system.
None of the mentioned
8) Five resistors are connected as in the following figure. Find the equivalent resistance between A and C. Round your answer up to two decimals. Give your answer in Ohm.
9) What is the output voltage, Vo in the following figure scheme?
-7
-6
-1
6
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