Physics Force & Laws Of Motion Level: High School
A 15.00 lb block rests on the floor .(a) What force does the floor exert on the block ?
(b) If rope is tied to the block and run vertically over a pulley , and the other end is attached to a free-hanging 10.0-lb weight , What is the force exerted by the floor on the 15.00 lb block ?
(c) If we replace the 10.0 lb weight in part (b) with a 20.0 lb weight , What is the force exerted by the floor on the 15.0 lb block ?
Physics Force & Laws Of Motion Level: High School
Three forces acting on an object are given by F1 = (-2.00 i + 2.00 j ) N , F2 = (5.00 i – 3.00 j) N , and F3 = (-45.0 i ) N . The object experiences an acceleration of magnitude 3.75 m/s^2 .(a) What is the direction of the acceleration ?
(b) What is the mass of the object ?
(c) If the object is initially at rest , what is its speed after 10.0 s ?
(d) What are the velocity components of the object after 10.0 s
Physics Force & Laws Of Motion Level: High School
You stand on a seat of a chair and then hope off .(a) During the time you are in flight down to the floor , the Earth is lurching up toward you with an acceleration of what order of magnitude ? In your solution explain your logic , Model of Earth as a perfectly solid object
(b) The Earth moves up through a distance of what order of magnitude ?
Physics Force & Laws Of Motion Level: High School
A 0.100 kg ball is thrown straight up into the air with an initial speed of 15.0 m/s . Find the momentum of the ball(a) At its maximum height
(b) Halfway up to its maximum height
Physics Force & Laws Of Motion Level: High School
Calculate the speed in m/s at which Earth revolves about the sun . You may assume the orbit is nearly circular .
Physics Force & Laws Of Motion Level: High School
Ignoring air drag , What is the maximum speed possible for a horizontally moving tennis ball as it clears the net 1.0 m high and strikes within the court’s border , 12.0 m distant ?
Physics Force & Laws Of Motion Level: High School
In raising a 5000 N piano with a pulley system , the workers note that , for every 2 –m of rope pulled down , the piano rises 0.2 m . Ideally , how much force is required to lift the piano ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
Two automobiles , each of mass 1000 kg , are moving at the mass speed , 20 m/s , When they collide and stick together . In what direction and at what speed does the wreckage move(a) If one car was driving north and one south ?
(b) If one car was driving north and one east ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 5 kg fish swimming 1 m/s swallows an absent-minded 1 kg fish swimming toward it at velocity that brings both fish to a halt immediately after lunch . What is the velocity v of the smaller fish before lunch ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
Judy (mass 40.0 kg) , standing on slippery ice , catches her leaping dog . Atti (mass 15 kg ) moving horizontally at 3.0 m/s . What is the speed of Judy and her dog after the catch ?
Physics Force & Laws Of Motion Level: High School
A disc of mass m moves horizontally to the right with speed v on a table with negligible friction when it collides with a second disc of mass 3 m . The second disc is moving horizontally to the right with speed v/9 at the moment of impact . What is the speed of the composite body immediately after the collision ?1. vf = 2/9 v
2. vf = 4/9 v
3. vf = 5/14 v
4. vf = 5/9 v
5. vf = 3/10 v
6. vf = 1/2 v
7. vf = 11/36 v
8. vf = 9/16 v
9. vf = 1/3 v
10. None of these are correct.
Physics Force & Laws Of Motion Level: High School
Collision
Two identical ball (labeled A and B ) move on a frictionless horizontal tabletop . Initially , ball A moves at speed uA,O = 10 m/s while ball B is at rest (uB,O = 0)The two balls collide off-center , and after the collision ball A moves at speed uA = 6 m/s in the direction theta A = 53 degree from its original velocity vector :
Which of the diagram which is shown at “click here” best represents the motion of ball B after the collision ?
Physics Force & Laws Of Motion Level: High School
Calculate the magnitude of the linear momentum for each of the following cases ;A). A proton with mass 1.67 x 10^-27 kg moving with a speed of 4860000 m/s .
B) A 15.2 g bullet moving with a speed of 344 m/s
C) A 78.1 kg sprinter running with a speed of 10 m/s .
D) Earth (mass = 5.98 x 10^24 kg) moving with an orbital speed equal to 27149.5 m/s . Answer in units of kg . m/s .
Physics Force & Laws Of Motion Level: High School
(A) A 81.6 kg person throws a 0.068 kg snowball forward with a ground speed of 13.9 m/s . A second person , of mass 64.8 kg catches the snowball . Both people are on skates . The first person is initially moving forward with a speed of 3.17 m/s , and the second person is initially at rest . What is the velocity of the first person immediately after the snowball is thrown ? Disregard friction between the skates and the ice , Answer in units of m/s .(B)What is the velocity of the second person immediately after the snowball is caught ?
Physics Force & Laws Of Motion Level: High School
Conservation of Linear momentum
A)A rifle with a weight of 21 N fires a 7.9 g bullet with a speed of 161 m/s . The acceleration of gravity is 9.81 m/s^2. Find the recoil speed of the rifle . answer in units of m/s .A) If a 566 N man holds the rifle firmly against his shoulder , find the recoil speed of man and rifle
