Thursday

August 21, 2014

August 21, 2014

Posted by **Alexandra** on Sunday, November 25, 2012 at 4:02pm.

This is part three of three parts.

1st Part: A player strikes a hockey puck giving it a velocity of 39.486 m/s. The puck slides across the ice for 0.231s after which time its velocity is 38.666 m/s. The acceleration of gravity is 9.8 m/s^2. If the mass of the puck is 209 g, what is the average drag force on it by the ice? The answer is: -0.74190 N.

2nd Part: What is the coefficient of kinetic friction for the puck sliding on ice? The answer is 0.3622228112.

I would REALLY appreciate any help! Thanks<3

- Physics -
**Elena**, Sunday, November 25, 2012 at 4:57pm(a)

v=v₀-at

a=( v-v₀)/t=(38.666-39.486)/0.231 =-3.55 m/s²

F(dr)=ma=-0.209•(-3.55)=-0.7419 N

(b)

F(dr)=μN=μmg

μ=F(dr)/mg=0.7419/0.209•9.8=0.362

(c)

Work-energy theorem

ΔKE=W(dr)

0-mv²/2=F•s.

F= - mv²/2s= - 0.209• 39.486²/2•0.041=-3935N

**Related Questions**

Physics - A player strikes a hockey puck giving it a velocity of 47.673 m/s. The...

Physics - A player strikes a hockey puck giving it a velocity of 47.673 m/s. The...

Physics - A hockey goalie is standing on ice. Another player fires a puck (m = 0...

physics - A hockey goalie is standing on ice. Another player fires a puck (m = 0...

physics homework - a hockey puck of mass 0.05kg sliding on the ice with velocity...

Physics - A)a 72 kg man jumps from a window 1.2 m above a sidewalk. the ...

physics - A hockey puck of mass 0.05 kg sliding on the ice with velocity 20m/sec...

physics - A soccer goalie (m = 65 kg) collides with the goalpost. If she was ...

physics - a goalie standing on a frictionless surface catches a 270.0-g puck ...

Physics - A 71.1 kg man steps out a window and falls (from rest) 1.24 m to a ...