Question

An ice-skaters of mass 70 kg is moving to the right with a speed of 20 m/s. She bumped into a 62kg ice-skater moving in opposite direction at 13 m/s. Both hold on to each other after the collision. Determine: A) Their final velocity B) the fraction of the initial energy lost

Answer #1

Solution.

Two ice skaters, Daniel (mass 65.0 kg ) and Rebecca (mass 45.0
kg ), are practicing. Daniel stops to tie his shoelace and, while
at rest, is struck by Rebecca, who is moving at 14.0 m/s before she
collides with him. After the collision, Rebecca has a velocity of
magnitude 8.00 m/s at an angle of 55.1 ∘ from her initial
direction. Both skaters move on the frictionless, horizontal
surface of the rink.
a.What is the magnitude of Daniel's velocity...

Two ice skaters, Daniel (mass 70.0 kg ) and Rebecca (mass 45.0
kg ), are practicing. Daniel stops to tie his shoelace and, while
at rest, is struck by Rebecca, who is moving at 13.0 m/s before she
collides with him. After the collision, Rebecca has a velocity of
magnitude 8.00 m/s at an angle of 55.1 ∘ from her initial
direction. Both skaters move on the frictionless, horizontal
surface of the rink.
Part A What is the magnitude of...

Two ice skaters, Daniel (mass 69.0 kg) and Rebecca (mass 51.0
kg) are practicing. Daniel stops to tie his shoelace and, while at
rest, is struck by Rebecca, who is moving at 13.5 m/s before she
collides with him. After the collision, Rebecca has a velocity of
magnitude 6.3 m/s at an angle of 51.5° from her initial direction.
Both skaters move on the frictionless, horizontal surface of the
rink.
(a) What are the magnitude and direction of Daniel's velocity...

Two ice skaters, Daniel (mass 65.0 kg ) and Rebecca (mass 45.0
kg ), are practicing. Daniel stops to tie his shoelace and, while
at rest, is struck by Rebecca, who is moving at 12.0 m/s before she
collides with him. After the collision, Rebecca has a velocity of
magnitude 8.00 m/s at an angle of 54.1 ∘ from her initial
direction. Both skaters move on the frictionless, horizontal
surface of the rink.
Part A
Part complete
What is the...

Two ice skaters, Daniel (mass 65.0 kg ) and Rebecca (mass 45.0
kg ), are practicing. Daniel stops to tie his shoelace and, while
at rest, is struck by Rebecca, who is moving at 12.0 m/s before she
collides with him. After the collision, Rebecca has a velocity of
magnitude 8.00 m/s at an angle of 54.1 ∘ from her initial
direction. Both skaters move on the frictionless, horizontal
surface of the rink.
Part A
Part complete
What is the...

Two ice skaters, Daniel (mass = 65.0 kg) and Rebecca (mass =
45.0 kg) are practicing on the ice. Daniel stops to tie his lace,
and while at rest he is struck by Rebecca, who is moving 12.0 m/s
before she collides with him. After the collision, Rebecca is
moving forward at 8.50 m/s at a 53 degree angle with respect to her
initial direction. What is the velocity vector (magnitude and
direction, or x- and y-components) of Daniel after...

Two ice skaters, Daniel (mass 65 kg) and Rebecca (mass 45 kg),
are practicing. Daniel stops to tie his skate lace and, while at
rest, is struck by Rebecca who is moving at 13.0 m/s before she
collides with him. After the collision, Rebecca has a velocity of
magnitude 8.00 m/s at an angle of 53.1 from her initial direction.
Both skaters move on the frictionless, horizontal surface of the
rink. 1) Determine the magnitude of the x-component Daniel's
velocity...

07.2 Skater A, with mass 80 kg and initial speed 9.0 m/s, runs
into stationary Skater B, mass 65 kg. After the collision, Skater A
moves at an angle of 55.0o from her original direction and Skater B
moves at an angle of 10o from Skater A’s original direction. Both
skaters move on the frictionless, horizontal surface of the rink.
(a) What are the final speeds of Skater A and Skater B. (b) Is
kinetic energy conserved? If not, what...

A 62 kg ice skater moving at 3.2 m/s collides with a second
stationary skater with mass 65 kg. The skaters cling together after
the collision and move without friction. Compute their speed after
the collision.

1. A railroad car of mass 2.40E+4 kg moving with a speed of 3.10
m/s collides and couples with two other coupled railroad cars each
of the same mass that are already moving in the same direction at a
speed of 1.00 m/s.
a. What is the speed (in m/s) of the three coupled cars after
the collision?
b.How much kinetic energy (in J) is lost in the collision?
2.A ring (2 kg, r = 2 m) rotates in a...

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