Physics Force & Laws Of Motion Level: High School
A women at an airport is towing her 20.0 kg suitcase at constant speed by pulling on a strap at an angle theta above the horizontal . She pulls on the strap with a 35.0 N force , and the friction force on the suitcase is 20.0 N . Draw a free-body diagram of the suitcase .(a) What angle does the strap make with the horizontal ?
(b) What normal force does the ground exert on the suitcase ?
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 Rotational Mechanics Level: High School
To tighten a bolt , you push with a force of 80 N at the end of a wrench handle that is 0.25 m from the axis of the bolt .(a) What torque are you exerting ?
(b) If you move your hand inward to be only 0.10 m from the bolt , What force do you have exert to achieve the same torque ?(c) Do your answer depend on the direction of your push relative to the direction of the wrench handle ?
Physics Work,Power & Energy Level: High School
A 60 kg skydiver moving at terminal speed falls 50 m in 1 s . What power is the skydiver expending on the air ?
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 Electrostatics Level: High School
A proton accelerates from rest as it falls through a potential difference . If the proton acquires a speed of 2 x 10 to the 6th m/s .(a) How much kinetic energy did it acquire
(b) Through how large a potential difference did it fall ?
Physics Electrostatics Level: High School
Ten joules of work must be done against electric forces to carry a +1 C charge from point A to point B(a) What is the potential difference between A and B ?
(b) How much work is needed to carry a proton from A to B ?
