Physics Properties Of Matter Level: High School
Archimedes Principle
A rock weighs 140 N in air and has a volume of 0.00278 m^3 .The acceleration of gravity is 9.8 m/s^2
What is its apparent weight when submerged in water ? Answer in units of N .
Physics Properties Of Matter Level: High School
Pascal’s law
The small pistol of a hydraulic lift has a cross-sectional area of 8 cm^2 and the large piston has an area of 56 cm^2What force F must be applied to the small piston to maintain the load of 58 kN at a constant elevation ? Answer in units of N .
Physics Properties Of Matter Level: High School
Pressure
What must be the contact area between a suction cup(completely exhausted ) and a ceiling in order to support the weight of an 32.7 kg student ?The acceleration of gravity is 9.8 m/s^2 . Answer in units of m^2 .
Physics Waves And Oscillations Level: High School
A 76 kg man in a 5.6 kg chair tilts back so that all his weight is balanced on two legs of the chair . Assume that each leg makes constant with the floor over a circular area of radius 1.2 cm .Find the pressure exerted on the floor by each leg .
The acceleration of gravity is 9.8 m/s^2 . Answer in units of Pa .
Physics Waves And Oscillations Level: High School
Find the amplitude of the motion . Answer in units of m .
Physics Waves And Oscillations Level: High School
A 0.414 kg mass is attached to a spring and executes simple harmonic motion with a period of 0.516 s . The total energy of the system is 3 J .Find the force constant of the spring . Answer in units of N/m .
Physics Waves And Oscillations Level: High School
A 79.8 g mass is attached to a horizontal spring with a spring constant of 10.2 N/m and released from rest with an amplitude of 30.9 cm .What is the velocity of the mass when it is halfway to the equilibrium position if the surface is frictionless ? Answer in unit of m/s .
Physics Properties Of Matter Level: High School
Solids
By how much does the wire stretch while the masses are in motion ? Answer in units of mm .
Physics Properties Of Matter Level: High School
Solids
A 2.6 m long cylindrical steel wire with a cross-sectional diameter of 5.5 mm is placed over a frictionless pulley , with one end of the wire connected to a mass 6.5 kg and the other end to a mass 3.5 kg .The acceleration of gravity is 9.8 m/s^2 . Given : Young’s modulus for steel Y = 2 x 10^11 Pa .
What is the tension in the wire while the masses are in motion ? Answer in units of N .
Physics Misc Topic Level: Misc Level
Solids
A stinless steel orthodontic wire is applied to a tooth that is out of line by 21 degree . The wire has an unstretched length of 4.5 cm and a diameter of 0.21 mm . If the wire is stretched 0.1 mm . find the magnitude of the force on the tooth . (Disregard to the width of the tooth). Young’s modulus for stainless steel is 1.8 x 10^11 Pa . Answer in units of N .
Physics Properties Of Matter Level: High School
Solids
A stinless steel orthodontic wire is applied to a tooth that is out of line by 21 degree . The wire has an unstretched length of 4.5 cm and a diameter of 0.21 mm . If the wire is stretched 0.1 mm . find the magnitude of the force on the tooth . (Disregard to the width of the tooth). Young’s modulus for stainless steel is 1.8 x 10^11 Pa . Answer in units of N .
Physics Properties Of Matter Level: High School
Solids
A 360 kg load is hung on a wire of length 4.5 m , cross sectional area 3.7 x 10^-5 m^2 , and Young’s modulus 8 z 10^10 N/m^2 .The acceleration of gravity is 9.8 m/s^2 . What is its increase in length ? Answer in unit of mm .
Physics Properties Of Matter Level: High School
Solids
The elastic limit of copper is 1.82 x 10^8 N/m^2 . The acceleration of gravity is 9.8 m/s^2 . Determine the minimum diameter a copper wire can have under a load of 7.71 kg if its elastic limit is not be exceeded . Answer in units of m .
Physics Rotational Mechanics Level: High School
A uniform bar of length 28 m and mass 8kg is attached to a wall with a hinge that exerts on the bar the horizontal force Hx and a vertical force Hy . The bar is held by a cord that makes a 90 degree angle with respect to bar and angle 31degree with respect to wall . The acceleration of gravity g = 9.8 m/s^2 . What is the magnitude of the horizontal force Hx on the pivot ? Answer in units of N .
Physics Rotational Mechanics Level: High School
Calculate the change in kinetic energy of the system . Answer in units of J .