Physics Force & Laws Of Motion Level: High School
An 77.5 g arrow is fired from a bow whose string exerts an average force of 98.9 N on the arrow over a distance of 78.4 cm , What is the speed of the arrow as it leaves the bow ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
The result of a collision experiment performed by a group of students (on a horizontal frictional surface ) is summarized on a Displacement versus Time graph shown below .(a) By analyzing the graph , describe (in written statements) the collision of the objects . Sketch the collision diagram .
(b) Use data from the graph to prove that the momentum is conserved during the above collision. Identify the physical quantities and specify directions .
(c) Is the collision elastic or inelastic ? Prove your answer mathematically .
(d) Conclusion .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A helium atom (mass 4.0 u ) moving at 600.0 m/s to the right collides with an oxygen molecule (mass 32 u) moving in the same direction at 400.0 m/s . After the collision, the oxygen molecule moves at 500.0 m/s to the right . What is the velocity of the helium atom after the collision ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
In the railroad freight yard , an empty freight car of mass m rolls along a straight level track at 1.0 m/s and collides with an initially stationary , fully loaded completion .(a) What is the speed of the two cars after collision ?
(b) Suppose instead that two cars rest after collision . with what was the speed was the fully loaded boxcar moving before the collision if the empty one was moving at 1.0 m/s ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A submarine with a mass of 2.5 x 10^6 kg and initially at rest fires a torpedo with a mass of 250 kg . The torpedo has an initial speed of 100.0 m/s . What is the initial recoil speed of the submarine . Neglect the drag force of the water .
Physics Force & Laws Of Motion Level: High School
Calculate the thrust of a rocket that produces a jet of hot gases at the rate of 1430.0 kg/sec . If the stream of molecules is moving at a speed of 24000.0 m/sec (on average) with respect to the rocket .
Physics Force & Laws Of Motion Level: High School
A 12.0 gm bullet has an initial velocity of 203.0 m/sec due south . It ricochets off a barrier and after travels due east at 148.2 m/sec .(a) Find the magnitude of the change in momentum undergone by the bullet . kg m/sec
(b) Find the change in kinetic energy experienced by the bullet .
(c) Find the size of the impulse exerted by the barrier on the bullet .
Physics Force & Laws Of Motion Level: High School
The force shown in the figure at “click here” acts on a 1.7 kg object whose initial speed is 0.44 m/s and initial position is x = 0.27 m .(a) Find the speed of the object when it is at the location x = 0.81 m .
(b) At what location would the object’s speed be 0.37 m/s ?
Physics Force & Laws Of Motion Level: High School
A 90 kg man jumps from a window 0.8 m above a sidewalk ?(a) What is his speed just before his feet strike the pavement ?
(b) If the man jumps with his knees and ankles locked , the only cushion for his fall is approximately 0.50 cm in the pads of his feet . Calculate the average force exerted on him by the ground in this situation .
Physics Force & Laws Of Motion Level: High School
A 10 kg block is dragged 20 m by a parallel force of 26 N . If (mu) = .2, What is the result of work and what acceleration results ?
Physics Force & Laws Of Motion Level: High School
(a) A two masses are arranged with one of 50 kg , on a frictionless table , and the other of 30 kg attached by a cord handing off of a table . Find the acceleration .(b) Using the following equation : Friction = (mu) N or (mu) mg . Assume the table has friction and opposes the system . Find the acceleration of the system .
Physics Force & Laws Of Motion Level: High School
Find the acceleration and tension of the rope in the figure at “click here”
Physics Force & Laws Of Motion Level: High School
A 12 kg mass is placed on a 40 degree (frictionless) incline opposed by a 20 kg mass on a 25 degree frictionless incline . The two masses are attached via a rope . Determine the acceleration and tension of the rope .
Physics Force & Laws Of Motion Level: High School
Consider a double incline plane with angles , masses , and coefficient of friction s shown in the figure at “click here” . Calculate the acceleration of the system and the tension of the cord .
Physics Force & Laws Of Motion Level: High School
Collision
A block of mass m = 2.26 kg slides down an alpha = 33.4 degree incline which is h = 3.56 m high . At the bottom , it strikes a block of mass M = 6.50 kg which is at rest on a horizontal surface . as seen in the figure at “click here” . (Assume a smooth transition at the bottom of the incline .) If the collision is in elastic , and friction can be ignored , determine the speed of the smaller block after the collision .(a) Determine the speed of the bigger block after the collision .
(b) Determine how far back up the incline the smaller mass will go .
