The third floor of a house is 8 m above street level. How much work is needed to move a 150 kg refrigerator to

Question

Hey yall! I need help with three physics questions. I hope you guys can help me!!! Thanks!!!!!!!!

1. The third floor of a house is 8 m above street level. How much work is needed to move a 150 kg refrigerator to the third floor?

2. Stan does 176 J of work lifting himself .300 m. What is Stan's mass?

3. Lee pushes a 20 kg mass 10 m across a floor with a horizontal force of 80 N. Calculate the amount of work Lee does.

Answer 1

1. 150*9.81*8 J
2 176=m*9.81*.300
3 80*10 J

j

Answer 2

1) work = force*distance

work = (150*9.8) * 8 m
work = 11760J

2) work = force * distance
176 = force * .3m
force = 586.67N

divide 9.8 to get the mass
m = 59.86kg

3) work = force*distance
work = 80N * 10m
work = 800J

hope this helps

Answer 3

if you're looking for the acceleration, you would probably just use 9.81 m/s^2.
for example 1: formula used: W(work)=M(mass)A(acceleration)D(distance).
W=MAD
W=(150kg)(9.81 m/s^2)(8 m)
W=11772 Joules