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 ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A two-stage rocket moves in space at a constant velocity of 4850 m/s . The two stages are then separated by a small explosive charge placed between them . Immediately after the explosion the velocity of the 1320 kg upper stage is 5520 m/s in the same direction as before the explosion . What is the velocity (magnitude and direction) of the 2360 kg lower stage after the explosion ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 57.0 kg person , running horizontally with a velocity of +3.92 m/s , jumps onto a 12.6 kg sled that is initially at rest.(a). Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away .
(b). The sled and person coast 30.0 m on level snow before coming to rest . What is the coefficient of kinetic friction between the sled and the snow ?
Physics Force & Laws Of Motion Level: High School
A 5.00 kg ball (ball 1) , moving to the right at a velocity of +4.00 m/s on a frictionless table , collides head-on with a stationary 7.90 kg ball (ball 2) . Find the final velocity of the balls if the collision is as specified below .a. Elastic collision.
b. Completely inelastic collision .
Physics Force & Laws Of Motion Level: High School
The lead female character in the movie Diamond Are Forever is standing at the edge of an offshore oil rig . As she fires the gun she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.007 kg , and its velocity is +700 m/s . Her mass including the gun is 56 kg .(a) What recoil velocity does she acquire in response to a single shot from a stationary position, assuming that no external force keeps her in place ?
(b) Under the same assumption , what would be her recoil velocity if , instead , she shoots a blank cartridge that ejects a mass of 5.0 10-4 kg at a velocity of +700 m/s ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
For tests using a ballistocardiograph , a patient lies on a horizontal platform that is supported on jets of air, Because of the air jets, the friction impending the horizontal motion of the platform is negligible . Each time the heart beats , blood is pushed out of the heart in a direction that is nearly parallel to the platform. Since momentum must be conserved , the body and the platform recoil, and this recoil can be detected to provide information about the heart . For each beat, suppose that 0.050 kg of blood is pushed out of the heart with a velocity of +0.25 m/s and that the mass of the patient and the platform is 80 kg . Assuming that the patient does not slip with respect to the platform , and that the patient and the platform start from rest , determine the recoil velocity .
Physics Force & Laws Of Motion Level: High School
When jumping straight down, you can be seriously injured if you land stiff-legged . One way to avoid injury is to bend your knees upon landing to reduce the force of the impact . A 75 kg man just before contact with the ground has a speed of 6.5 m/s .a). In a stiff-legged landing he comes to a halt in 1.7 ms. Find the average net force that acts on him during this time .
b). When he bends his knees , he comes to a halt in 0.13 s. Find the average force now .
c). During the landing , the force on the man points upward , while the force due to gravity points downward . The average net force acting on the man includes both of these forces . Taking into account the direction of these forces , find the force of the ground on the man in parts (a) and (b) .
Physics Force & Laws Of Motion Level: High School
Centre of Mass
A sulfur dioxide molecule consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom , Using the information and the data provided in the drawing at “click here” , find the coordinates of the center of mass of the sulfur dioxide molecule . Express your answer in nanometers . (1 nm = 10-9 m) .
Physics Force & Laws Of Motion Level: High School
With the engine off , a spaceship is coasting at a velocity of +290 m/s through outer space . The ship carries rockets that are mounted in firing tubes, the back ends of which are closed . It fires a rocket straight ahead at an enemy vessel . The mass of the rocket is 1400 kg , and the mass of the spaceship (not including the rocket) is 5.0 106 kg . The firing of the rocket brings the spaceship to a halt . What is the velocity of the rocket ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 0.180 kg projectile is fired with a velocity of +725 m/s at a 2.00 kg wooden block that rests on a frictionless table . The velocity of the block , immediately after the projectile passes through it , is +50.0 m/s . Find the velocity with which the projectile exits from the block .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
The drawing shows a collision between two pucks on an air-hockey table . Puck A has a mass of 0.038 kg and is moving along the x axis with a velocity of +5.5 m/s . It makes a collision with puck B, which has a mass of 0.058 kg and is initially at rest . The collision is not head-on . After the collision , the two pucks fly apart with the angles .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 2.50 g bullet , traveling at a speed of 465 m/s , strikes the wooden block of a ballistic pendulum , The block has a mass of 275 g .a). Find the speed of the bullet/block combination immediately after the collision ?
b). How high does the combination rise above its initial position ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 1055 kg van , stopped at a traffic light , is hit directly in the rear by a 790 kg car traveling with a velocity of +2.50 m/s . Assume that the transmission of the van is in neutral . the brakes are not being applied , and the collision is elastic . what is the final velocity of each vehicle ?
Physics Force & Laws Of Motion Level: High School
A 55 kg swimmer is standing on a stationary 250 kg floating raft . The swimmer then runs off the raft horizontally with a velocity of +5.3 m/s relative to the shore . Find the recoil velocity that the raft would have if there were no friction and resistance due to the water .
Physics Force & Laws Of Motion Level: High School
A baseball (m = 149 g) approaches a bat horizontally at a speed of 42.9 m/s ( 96 mi/h) and is hits straight back at a speed of 46.0 m/s (103 m/h ) . If the ball is in contact with the bat for a time of 1.10 ms , What is the average force exerted on the ball by the bat ? Neglect the weight of the ball . since it is so much less than force of the bat . Choose the direction of the incoming ball as the positive direction .