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 Force & Laws Of Motion Level: High School
Friction
A horizontal contact force accelerates a block of mass 1.10 kg from 10.0 m/s on a rough , horizontal surface .a) If the coefficient of kinetic friction between the block and the surface is 0.190 , and the block travels 12.0 m while accelerating, what is the magnitude of the contact force ?
b) What is the average rate at which friction takes energy away from the block ?
Physics Properties Of Matter Level: High School
Boyle’s Law
A bubble is exhaled by a SCUBA diver 30 m below the surface of a freshwater lagoon . If the diameter of the spherical bubble is 2 cm when it leaves the diver, determine its diameter as it rises 10 cm, 20 cm and just before it reaches the surface .
Physics Properties Of Matter Level: High School
Pressure
A five foot deep above ground swimming pool is being drained through a 6” round hole in the bottom of the pool that opens to the atmosphere . A younger wearing swim fins gets too close the hole and the fin gets “sucked” up against the opening . Do you think that he can pull the flipper loose ? With how much force must he pull ?
Physics Properties Of Matter Level: High School
Pressure
The deepest know ocean depth is Mariana Trench off the coast of the Philippines- it has been measured to be about 6.8 miles. It the sea water is about 2.6% more dense than fresh due to its dissolved salt , what is the pressure (lb/ft^2) at the bottom of the Trench. Convert your answer to atm, psig, and pa .
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 Gravitation Level: High School
The moon moves around the earth with radius 3.84 x 10^8 m (the distance from the center of Earth to the center of Moon) . The mass of earth is 6.0 x 10^24 kg .a) What force (you do not need to tell how much of this force) provides the centripetal fore when the Moon resolves ?
b) Calculate the speed of moon moving around the earth based on the answer in (a).
Physics Rotational Mechanics Level: High School
Rotational Kinematics
The turntable of a record player rotates initially at 30 rev/min and takes 10 s to come to rest .a) What is the angular acceleration of the turntable ?
b) How many rotations does the turntable make before coming to rest ?
c) If the radius of the turntable is 0.20 m , what is the initial linear speed of a bug riding on the rim ?
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 Force & Laws Of Motion Level: High School
Impulse
A 0.15-kg baseball is thrown with a speed of 20 m/s . It is hit straight back at the pitcher with a final speed of 25 m/s .a) What is the impulse delivered to the ball ?
b) Find the average force exerted by the bat on the ball if the two are in contact for 0.002 s .
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 Force & Laws Of Motion Level: High School
Newton’s Law of Motion
In the figure which is shown at “click here” , the coefficient of kinetic friction between the surface and the larger block is 0.20 and the coefficient of kinetic friction between the surface and the smaller block is 0.30 . If F = 10 N and M = 1.0 kg , what is the tension in the connecting string ? Draw free body diagram for each block and apply Newton’s law of motion to solve .