Physics Work,Power & Energy Level: High School
Vertical Circle
Ferris wheel has radius 5.0 m and make one revolution in 8.0 seconds. A person weighing 670 N is sitting on one of the benches attached at the rim of the wheel . What is the apparent weight (that the normal exerted on her by the bench) of the person as she passes through the highest point of her motion ?
Physics Work,Power & Energy Level: High School
Inelastic Collision in Two dimensional
A 49.0 kg skater is traveling due east at a speed of 3.04 m/s . A 69.5 kg skater is moving due south at a speed of 6.94 m/s . They collides and hold on to each other after the collision, managing to move off at an angle south of east , with a speed of vf . Find the angle theta ? and find the speed vf, assuming that friction can be ignored ?
Physics Work,Power & Energy Level: High School
In the apparatus shown at “click here” , m1 = 1.00 kg, m2 = 1.50 kg , and m3 = 2.50 kg . (Ignore friction and the masses of the strings)a) What is the acceleration of the system ?
b) What are the tensions in the two string ?
Physics Work,Power & Energy Level: High School
Elastic Potential Energy
A block of mass 0.800 kg oscillates horizontally on a smooth surface due to a light, horizontal spring : the block compresses the spring by a maximum of 8.00 cm from its relaxed lengtha) If the total mechanical energy of block is 2.50 J , What is the value of the spring constant ?
b) What is the maximum speed with which the block moves ?
Physics Work,Power & Energy Level: High School
Assume that 5.0 g of a substance of 250 molecular weight is dissolved in 600 cm^3 of water at 27 degree C . What is the osmotic pressure of the solution ?
Physics Work,Power & Energy Level: High School
When 1 mole of solute is dissolved in 22.4 l of solution at 0 degree C , the osmotic pressure is 101325 Pa . What would this pressure be at 27 degree C ?
Physics Work,Power & Energy Level: High School
Inelastic Collision
A 10.0 g was of sticky clay is hurled horizontally at a 90.0 g wooden block initially at rest on a horizontal surface . The clay sticks to the block and they move with 5.0 m/s . What is the initial speed of the clay immediately before impact ?
Physics Work,Power & Energy Level: High School
Conservation Of Energy
Starting from rest , a 10.0 kg block slides 3.00 m down a frictionless ramp (inclined at 30.0 degree from the floor ) to the bottom . The block then slides an additional 5.00 m along the floor with friction before coming to a stop . Determinea) the speed of the block at the bottom of the ramp .
b) the coefficient of kinetic friction between block and the floor .
Physics Work,Power & Energy Level: High School
A 1000-kg car accelerates uniformly from rest to a speed of 30 m/s in the first 10 s (frictionless road) . Finda) the work done on the car in this time .
b) the average power delivered by the engine in the first 10 s .
c) the instantaneous power delivered by the engine at t = 2 s .
Physics Work,Power & Energy Level: High School
Power
A 10.0 kg object accelerates from rest at 0.50 m/s^2 across a horizontal surface for a distance of 4.25 m . If uk is 0.25 .a) Find the final kinetic energy of the object .
b) find the power required .
Physics Work,Power & Energy Level: High School
Conservation of Energy
A 52 kg crate , initially at rest, loses 15% of its potential energy through friction as it slides down a 2.00 m high ramp .a) Find the velocity of the crate
b) Find the time to slide down the ramp .
Physics Work,Power & Energy Level: High School
Conservation of Energy
A 3.25 kg mass falls from a height of 1.70 m onto a spring . for this spring, a force of 720 N will stretch it by 0.150 m .b) The spring will be compressed a maximum distance of ------- by the mass .
Physics Work,Power & Energy Level: High School
A small bubble is released from a depth of 6.00 m with a d = 0.35 mm, how large will the bubble be when it reaches the surface ? Temperature is constant .
Physics Work,Power & Energy Level: High School
Conservation of Energy
A block with mass m starting from rest at point A is sliding down a rough incline with kinetic coefficient of friction mu . The incline has angle theata with respect to the horizontal surface . As the block slides down for a distance s , it passes point B . Find the kinetic energy of the block as it passes B .1) KB = mg s sin theata-mu mg s sin theata
2) KB = mg s cos theata + mu mg s cos theata
3) KB = mg s cos theata + mu mg s sin theata
4) KB = mg s sin theata + mu mg s cos theata
5) KB = mg s sin theata – mu mg s cos theata
Physics Work,Power & Energy Level: High School
Conservation of Energy
A 2.99 g bullet moving at 258 m/s penetrates a tree to a depth of 6.12 cm . Use energy consideration to find the average frictional force that stops the bullet . Answer in units of N .