# Physics

posted by .

Question # 1 Marks = 12
A worker pushes 25Kg crate a distance of 5m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic frication between the crate and the floor is 0.23.
(a) What magnitude of force must the worker apply?
(b) How much work is done on the crate by this force?
(c) How much work is done on the crate by frication?
(d) How much work is done on the crate by normal force?
(e) How much work is done on the crate by the gravity?
(f) What is the total work done on the crate?

• Physics -

Wc = mg = 25kg * 9.8N/kg = 245N. = Weight of crate.

Fc = 245N @ 0deg.
Fp = 245sin(0) = 0 = Force parallel to floor.
Fv = 245cos(0) = 245N. = Force perpendicular to floor = Normal.

Ff = u*Fv = 0.23 * 245 = 56.35N. = Force of friction.

a. Fn = Fap - Fp - Ff = ma = 0, a = 0.
Fap - 0 - 56.35 = 0,
Fap = 56.35N. = Force applied.

b. W = Fap*d = 56.35 * 5 = 281.8J.

c. W = Ff*d = 56.35 * 5 = 281.8J.

d. W = Fv*h = 245 * 0 = 0.

e. W = Fc*h = 250 * 0 = 0.

• Physics -

you're way smarter than I am.

## Similar Questions

1. ### Physics- Work

A worker pushes a 1.50*10^3 N crate with a horizontal force of 345 N a distance of 24.0 m. Assume the coefficient of kinetic friction between the crate and the floor is 0.220. a. How much work is done by the worker on the crate?

A worker pushes a 820 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic frictin between the crate and the floor is 0.22. a) How much work is done by the worker on the crate?
3. ### Physics

A worker pushes 25Kg crate a distance of 5m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic frication between the crate and the floor is 0.23. (a) What magnitude of force must the …
4. ### PHYSICS

A factory worker pushes a 30.7 crate a distance of 4.0 along a level floor at constant velocity by pushing downward at an angle of 31 below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.26. What …
5. ### Physics

A worker applies a constant force of magnitude F = 339 N on a crate in a direction รจ = 26.1o above the horizontal as he pulls it across a level floor through a distance of s = 7.20 m. The mass of the crate is m = 53 kg and the coefficient …
6. ### Science

A factory worker pushes a 29.2kg crate a distance of 4.1m along a level floor at constant velocity by pushing downward at an angle of 28* below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25.
7. ### Physics

A factory worker pushes a 29.2kg crate a distance of 4.1m along a level floor at constant velocity by pushing downward at an angle of 28 degrees below the horizontal. The coefficient of kinetic friction between the crate and floor …
8. ### Physics

Two workers are sliding 310kg crate across the floor. One worker pushes forward on the crate with a force of 440N while the other pulls in the same direction with a force of 230N using a rope connected to the crate. Both forces are …
9. ### Physics

A factory worker pushes a 32.0 kg crate a distance of 4.9 m along a level floor at constant velocity by pushing downward at an angle of 32 ∘ below the horizontal. The coefficient of kinetic friction between the crate and floor …
10. ### physics

Two workers are sliding 330 kg crate across the floor. One worker pushes forward on the crate with a force of 410 N while the other pulls in the same direction with a force of 240 N using a rope connected to the crate. Both forces …

More Similar Questions