- #1
Sirsh
- 267
- 10
Hi, i was just wondering with this question because I'm unsure if I am supposed to add both kinetic and gravitation energy into this answer? thanks.
1 A crane on a building site lifts an 8.00 × 102 kg load from ground level to a vertical height of 90.0 m at a constant speed of 2.00 m s–1. Ignore the mass of the cable.
A. How much work is done by the crane in lifting the load through this distance?
m = 800kg h = 90m g = 9.8ms^-2
E = mgh
E = 800*9.8*90
= 7.056*10^5 J
Sirsh.
1 A crane on a building site lifts an 8.00 × 102 kg load from ground level to a vertical height of 90.0 m at a constant speed of 2.00 m s–1. Ignore the mass of the cable.
A. How much work is done by the crane in lifting the load through this distance?
m = 800kg h = 90m g = 9.8ms^-2
E = mgh
E = 800*9.8*90
= 7.056*10^5 J
Sirsh.