Homework Help: Physics

Posted by Litany on Friday, November 13, 2009 at 6:03am.

An ice skater is gliding horizontally across the ice with an initial velocity of +6.3 m/s. The coefficient of kinetic friction between the ice and the skate blades is 0.081, and air resistance is negligible. How much time elapses before her velocity is reduced to +2.8 m/s ?

Physics - drwls, Friday, November 13, 2009 at 8:06am
First calculate the friction force on the ice skates. Call that F
F = M g *(0.081)
The loss of forward momentum equals the impulse, F*t
M (6.3 - 2.8) = F * t = M g *0.081* t

Note that M cancels out, so you do not need to know the mass M

t = (3.5 m/s)/[0.081*9.8 m/s^2]
= 4.4 seconds

Answer this Question

Related Questions

Physics (49) - An ice skater is gliding horizontally across the ice with an ...
homework physics 2 - An ice skater is gliding horizontally across the ice with ...
Physics - A skater with an initial speed of 7.6 m/s is gliding across the ice. ...
physics - a skater with an initial speed of 7.60m/s is gliding across the ice. ...
Physics - An ice skater of mass 55.3 kg stops to tie his shoe and is at rest. A ...
physics - a skater with an initial speed of 7.60m/s is gliding across the ice. ...
physics - A 63-kg ice-skater glides with a speed of 10 m/s toward a 14-kg sled ...
physics - an ice skater starts out traveling with a velocity of (-3,-7) m/s. he ...
physics - A 74.0 kg ice skater moving to the right with a velocity of 2.58 m/s ...
physics - A 74.0 kg ice skater moving to the right with a velocity of 2.58 m/s ...

For Further Reading

First Name:
School Subject:
Answer: