Physics Properties Of Matter Level: Misc Level
the height of the Eifel tower is 321 m during the summer when the temperature is 29.7 celcius. what is the magnitude of the change in the height of the tower, when the temperature cools down to-19.8 celcius during the winter? the coefficient of linear expansion of the towers material is 1.10*10^-5 1/celcius.(in cm)
a)1.75*10^1 b)2.32*10^1 c)3.09*10^1 d)4.11*10^1 e)5.47*10^1 f) 7.27*10^1 g) 9.67*10^1 h)1.29*10^2
Physics Kinematics Level: Misc Level
an object is thrown directly downward from the top of a very tall building. thespeed of the object just as it is releases is 27.3 m/s. after being thrown, the object falls freelly due to gravity. neglect air resistance and calculate the distance, in meters which the object covers between times t1=2.47 and t2=5.49 s after it is thrown.
a) 123 b) 139 c) 157 d)177 e)200 f) 226 g) 256 h) 289
Physics Gravitation Level: Misc Level
if two planets have the same, but the second has twice the gravity, the second planet must also have half the radius.
-true- false
Physics Work,Power & Energy Level: Misc Level
an object moving in a circle with constant speed has zero acceleration.
-true- false
Physics Gravitation Level: Misc Level
Consider two planets orbiting a star. If one planet has eight times the period of another, it must also have four times the average orbital distance.
-true- false
Mathematics Algebra Level: Misc Level
Factor x3-6X2+11x-6. One of the factor is (x-1)
Mathematics Algebra Level: Misc Level
A 10- ft ladder is placed against a building so that the distance from the bottom of the ladder to the building is 2 feet less than the distance from the top of the ladder to the ground. What is the distance from bottom of the ladder to the building?
Mathematics Algebra Level: Misc Level
Find all positive and negative integers b for which the following polynomial can be factored: 2x2+bx-15
Mathematics Algebra Level: Misc Level
If a ball is thrown upward at 40 ft per second from a rooftop 24 ft above the ground , then its height above the ground t seconds after it is thrown is given by h=-16t2+40 t+24. Rewrite this formula with the polynomial on the right- hand side factored completely .Use the factored version of the formula to find h when t=3.
Physics Rotational Mechanics Level: Misc Level
Two particles, each with mass m=1.80 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d=0.710 m and mass M=0.408 kg. The combination rotates around the rotation axis with angular speed ω:=0403 rad/s. Measured about O,what are the combination,s (a) rotational inertia and (b) kinetic energy?
Physics Rotational Mechanics Level: Misc Level
Starting from rest, a disk rotates about its central axis with constant angular acceleration.In 3.0 s,it rotates 29 rad. During that time, what is the instantaneous angular velocity of the disk at the end of the 3.0 s?
Physics Circular Motion Level: Misc Level
A wheel has eight equally spaced spokes and a radius of 34 cm. It is mounted on a fixed axle and is spinning at 1.4 rev/s. You want to shoot a 21-cm-long arrow parallel to this axle and through the wheel without hitting any of the spokes. Assume that the arrow and the spokes are very thin. What minimum speed must the arrow have?
Physics Heat & Thermodynamics Level: Misc Level
A 200-g piece of platinum is placed inside a furnace until it is in thermal equirium. The platinum is then placed in a 100-g aluminum calormeter contaning 400 g of water at 5.00 c.If the final temperature of the water is 10.0 find the temperature of the fumance.
Physics Heat & Thermodynamics Level: Misc Level
A 100-g aluminum calorimeter contains 200g of water at 15.0 c. if 100g of lead at 50.0c and 60.0g of copper at 60.0c are placed un the calorimeter, what is the final temp in the calorimeter?
Physics Kinematics Level: Misc Level
Can an object have zero acceleration and non-zero velocity at the same time? Give examples.
