Physics Force & Laws Of Motion Level: High School
Conservation of linear momentum
A 8100 kg boxcar traveling at 14.4 m/s strikes a second car. The two stick together and move off with a speed of 5.26 m/s . What is the mass of the second car ?
Physics Force & Laws Of Motion Level: High School
Conservation of linear momentum
A 5780 open railroad car coasts along with a constant speed of 8.78 m/s on a level track , Snow begins to fall vertically and fills the car at a rate of 3.50 kg per minute .Ignoring friction with the tracks , what is the speed of the car after 93.0 min ?
Physics Force & Laws Of Motion Level: High School
Find the speed at which Superman (mass = 79.0 kg) must fly into a train (mass = 16621 kg) traveling at 95.0 km/hr to stop it .
Physics Force & Laws Of Motion Level: High School
(a) A 120 kg astronaut (including space suit) acquires a speed of 2.64 m/s by pushing off with his legs from an 1860 kg space capsule , What is the change in speed of the space capsule ?(b) If the push lasts 0.540 s, what is the average force exerted by each on the other ? As the reference frame , use the position of the capsule before the push.
Physics Force & Laws Of Motion Level: High School
(a) In a football match a 116 kg fullback is running at 3.98 m/s to the east and is stopped in 0.700 s by a head-on tackle by a tackler running due west . Calculate the original momentum of the fullback.(b) Calculate the average force exerted on the tackler .
Physics Force & Laws Of Motion Level: High School
(a) A car is stopped for a traffic signal . When the light turns green , the car accelerates , increasing its speed from 0 to 5.45 m/s in 0.710 s . What is the magnitude of the linear impulse experienced by a 66.3 kg passenger in the car during this time ?(b) What is the average force experienced by the passenger ?
Physics Force & Laws Of Motion Level: High School
What distinguishes a conservative force from a non-conservative force ?Work done by a conservative force is depend of the objects path and the work only depends upon the initial and final positions.
Work done by a conservative force is independent of the objects path and the work only depends upon the initial and final positions.
Physics Force & Laws Of Motion Level: High School
Consider an ideal elastic spring . The spring constant is :Not depend upon mass, displacement , or applied force.
Proportional to the applied force .
Inversely proportional to the applied force.
Proportional to the mass attached to the spring.
Proportional to the displacement from equilibrium.
Physics Force & Laws Of Motion Level: High School
For identical materials , static coefficient of friction cannot be greater than kinetic coefficient of friction .True
False
Physics Force & Laws Of Motion Level: High School
A wooden block slides directly down an inclined plane, at a constant velocity of 6 m/s . How large is the coefficient of kinetic friction (A micro k) , if the plane makes an angle of 25 degree with the horizontal ?0.91
2.1
0.42
0.37
0.47
Physics Force & Laws Of Motion Level: High School
A 140 kg tackler moving at 3.0 m/s meets head on (and tackles) a 90 kg halfback moving at 6.5 m/s . What will be their mutual speed immediately after the collision ?
Physics Force & Laws Of Motion Level: High School
A 15000 kg railraod car travels alone on a level frictionless track with a constant speed of 18.0 m/s . A 5000 kg additional load is dropped onto the car . What then will be its speed ?
Physics Force & Laws Of Motion Level: High School
Conservation of linear momentum
A child throws a 3.40 kg package horizontally from a boat with a speed of 10.0 m/s . Calculate the resulting velocity of the boat , assuming it was initially at rest . The mass of the child is 20.0 kg and that of the boat is 60.0 kg .
Physics Force & Laws Of Motion Level: High School
Calculate the force exerted on a rocket , given that the propelling gases are expelled at a rate of 1000 kg/s with a speed of 60000 m/s ( at takeoff )
Physics Force & Laws Of Motion Level: High School
A rifle with a weight of 20 N fires a 5.0 g bullet with a speed of 280 m/sa. Find the recoil speed of the rifle
b. If a 700 N man holds the rifle firmly against his shoulder , find the recoil speed of the man and rifle .
