Physics Work,Power & Energy Level: High School
A 1.2 kg mass is projected down a rough circular track (radius = 2.0 m) . The speed of the mass at point A is 3.2 m/s , and at point B it is 6.0 m/s , How much work is done on the mass between A and B by the force of friction ? The angle between A and B is 90 degrees .
Physics Work,Power & Energy Level: High School
A skier weighing 0.70 kN goes over a frictionless circular hill , (r = 10.0 m) . If the skier’s speed at point A is 9.2 m/s , What is the speed at the top of the hill (point B) ? The angle between A and B is 45 degrees .
Physics Work,Power & Energy Level: High School
A 2.0 kg block situated on a frictionless incline is connected to a light sprig (k=100 N/m) . The block is released from rest when the spring is unstreched . The pulley is frictionless and has negligible mass . What is the speed of the block when it has moved 0.20 m down the plane ?
Physics Work,Power & Energy Level: High School
A 4.0 kg block is lowered down a 37 degree incline a distance of 5.0 m from point A to point B . A horizontal force (F = 10 N) is applied to the block between A and B . The kinetic energy of the block at A is 10 J and at B it is 20 J . How much work is done on the block by the force of friction between A and B ?
Physics Work,Power & Energy Level: High School
A 2.0 kg particle has an initial velocity of (5i – 4j )m/s . Some time later , its velocity is ( 7i + 3j) m/s . What work was done by the resultant force during this time interval . Assume no energy is lost in the process ?
Physics Work,Power & Energy Level: High School
Discuss briefly showing truth or falsity .(a) A cannon ball has twice as much energy if it is given twice as much velocity .
(b) A freely falling body falls 5 times as far during the third second as it falls during the first second ?
(c) A long to line is more effective than a short one for hauliling a canal boat ?
(d) A ski jumper has a mass of 80 kg . Would the skier s greater mass create a advantage , dis-advantage or make no difference ? Explain clearly .
Physics Simple Machines Level: High School
A 225 kg piano is rolled up a 6.0 m ramp at a angle of 30 degrees , the men pushing the piano exert a combined force of 1560 N parallel to the ramp surface .(a) What is the AMA ?
(b) What is the IMA of the ramp ?
(c) What is the work in ?
(d) What is the work out ?
(e) What is the efficiency ?
Physics Work,Power & Energy Level: High School
A mass of 5.0 kg is hung from the end of a vertical spring , As a result of the addition of this mass the spring is stretched a distance of 125 cm . The spring is then lifted up until the spring is unstreched . The mass is then released and is allowed to fall until at some point it stops .(a) How far will the mass have fallen when it stops at the lowest point ?
(b) What will be the gravitational potential energy of this system when the mass is at the highest point ?
(c) What will be the elastic potential energy stored in the spring when the mass is at the lowest point ?
(d) What will be the kinetic energy at equilibrium ?
Physics Work,Power & Energy Level: High School
The ski jumper of mass 40.0 kg pushes off the top of a hill with a initial speed of 4.0 m/s . (slope angle 37 degrees and Uk = 0.10 )(a) How fast will she be moving after dropping 10.0 m in elevation ?
(b) How far will the skier then slide horizontally at the bottom of the hill ?
Physics Units Level: High School
For each set of units , identify whether they are units of force , work (or energy ) , power or momentum .Ns
Kg m^2/s^2
Kg m/s^2
Nm
J/s
kW hr
Physics Work,Power & Energy Level: High School
A car traveling with a speed of 3.0 m/s is coasting towards a 20 degree incline . determine how far the car coast up the hill Uk = 0.47 hint , sine theta = h/x .
Physics Properties Of Matter Level: High School
Gases
Assuming water molecules in the gas phase act as an ideal gas . how many times greater is the rms speed of water molecules in the gas phase at the boiling temperature of water compared to the freezing temperature of water
Physics Properties Of Matter Level: High School
Gases
If a certain amount of gas fills a 1.0 liter container and exerts a pressure on the walls of 2.0 N/m^2 at 2.0 N/m^2 at 20 degree Celsius . What would the pressure theoretically be at absolute zero . Assume it is an ideal gas and the container size remains constant .
Physics Ray Optics Level: High School
Consider two slabs of material with the same thickness , but made of materials differing in their index of refraction . Which of the following are true ?Physics Force & Laws Of Motion Level: High School
Two identical masses are attached by a light string that passes over a small pulley . One of the masses rests on a flat table top while the other hangs over the edge (assume this mass does not touch the ground . ) The table and the pulley are frictionless . The masses are moving . Find the acceleration of the masses .