What is his mass?
2006-09-15 02:28:03 · 3 answers · asked by bluedevilbabygirl 1 in Science & Mathematics ➔ Other - Science
WD - Work done.
F - Force.
d - Distance.
m - Mass.
a - Acceleration (due to gravity).
WD = F x d (J)
180J = F x (0392)
F = 180/ 0∙392
F = 459∙1836 735
But F = ma
m = F/a
m= 459∙1836 735/ 9∙81
m = 46∙8077 1391
m ≈ 46∙81 Kg.
2006-09-15 02:46:58 · answer #1 · answered by Brenmore 5 · 0⤊ 0⤋
J = joules, not jowles
Use the equation
[1] ... W = F x
to find out to find the force he needs for lifting:
[1a] ... 180 J = F * (0.392 m)
[1b] ... F = (180 J) / (0.392 m) = 459 N
This force is equal to his weight (Fg),
[2] ... Fg = m g
[2a] ... 459 N = m * (9.8 N/kg)
[2b] ... m = (459 N) / (9.8 N/kg) = 46.8 kg
2006-09-15 09:33:43 · answer #2 · answered by dutch_prof 4 · 1⤊ 0⤋
jowels? I've heard of joules, but never jowels. Also, if you're going to make up new units you can't just steal the abbreviation for existing ones.
F=ma
E=Fs
Thus, m=aE/s. As you haven't specified which planet he is on, I can't be sure of the acceleration rate for this question, but you should be able to find the data and solve the question from here.
2006-09-15 09:34:05 · answer #3 · answered by tgypoi 5 · 0⤊ 0⤋