Physics Circular Motion Level: Misc Level
5. At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 5.3 m above the water. One diver runs off the edge of the cliff, tucks into a " ball," and rotates on the way down with an average angular speed of 1.8 rev/s. Ignore air resistance and determine the number of revolutions she makes while on the way down.
Physics Circular Motion Level: Misc Level
4. A person is riding a bicycle, and its wheels have an angular velocity of +24.5 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop.During braking, the angular displacement of each wheel is +15.5 revolutions.
a) How much time does it take for the bike to come to rest?
b) What is the angular acceleration of each wheel?
Physics Circular Motion Level: Misc Level
2. A certain CD has playing time of 76 minutes. When the music stars, the CD is rotating at an angular speed of 4.8* 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1* 102 rpm. Find the magnitude of the average angular acceleration of the CD. Express your answer in rad/s 2.
Physics Circular Motion Level: Misc Level
1. The earth spins on its axis once a day and orbits the sun once a year (365. 24 days).Take the positive direction for the angular displacement to be the direction of the earth s motion.
a) Determine the average angular velocity of the earth as it spins on its axis.
b) Determine its angular velocity as it revolves around the sun.
Physics Force & Laws Of Motion Level: Misc Level
Questions: A fugitive tries to hop on a freight train traveling at a constant speed of 6.0 m/s. just as an empty box car passes him, the fugitive starts from rest and accelerates at a = 4. 0 m/s^2 to his maximum speed of 8. 0 m/s. (a) How long does it take him to catch up to the empty box car? (b)What is the distance traveled to reach the box car?
Physics Properties Of Matter Level: Misc Level
Questions:2.Newly refined gasoline (p=0.70*10 to third kg/m cubic) is being pumped from the refinery into storage tank 15 m above the pump. At the pump, a pressure gauge reads 2.7*10 to the fifth Pa and a rate meter reads 2.5 m/s.
a)Is a pressure gauge at the storage tank reads 1.4*10 to the fifth Pa, use Bernoulli s Law to find the gasoline speed as it enters the tank.
b)Use equation of continuity to determine the ratio of the pipe system s cross-sectional are at the pump to that at the tank.
c)Do we have enough information to find the mass flow rate? If not , explain why. If yes, then calculate it.
Physics Heat & Thermodynamics Level: Misc Level
An electric motor operates in such a way that is 70 percent efficient when consuming power at the rate of 200 W. The motor is basically copper and has a mass of 0.90 kg Assuming that all the lost power goes into heating the motor, how much will its temperature rise in 1 minute?
Physics Heat & Thermodynamics Level: Misc Level
How many grams of steam at 100 degrees C must be condensed in 500 grams of water at 20 degrees C to raise its temperature to 30 degrees C?
Physics Heat & Thermodynamics Level: Misc Level
How much heat is required to change 50 grams of lead at 20 degrees C to molten lead at 327 degrees C?
Physics Heat & Thermodynamics Level: Misc Level
How much heat must be removed from 50 grams of molten lead at 327 degrees C to change it to a solid?
Physics Heat & Thermodynamics Level: Misc Level
A 90 gram piece of hot iron is dropped into a 500 gram vat of oil at 20 degrees C. The final temperature of the oil and iron is 30 degrees C.Find the original temperature of the iron. (C=0.50 cal/g/degrees C for the oil.)
Physics Heat & Thermodynamics Level: Misc Level
A steel ball falls from a height of 20 meters into pile of sand.If one-half its energy ends up as heat in the ball, how much is the ball heated?
Physics Heat & Thermodynamics Level: Misc Level
An experiment to determine the specific heat of a gas makes use of a water manometer attached to a flask (the figure below). Initially the two columns of water are even. Suppose that atmospheric pressure is 1.2 10^5 Pa. After heating the gas, the water level change to those shown. Find the change in pressure of the gas in Pa.
Physics Properties Of Matter Level: Misc Level
Estimate the average blood pressure in a person's foot, if the foot is 1.38 m below the aorta, where the average blood pressure is 107 mm Hg. For the purposes of this estimate, assume the blood isn't flowing.
Physics Properties Of Matter Level: Misc Level
A block of wood floats in oil with 87.9% of its volume submerged. What is the density of the oil? The density of the block of wood is 0.68 g/cm3.
