Answer:
The compression in the spring is 5.88 meters.
Explanation:
Given that,
Mass of the car, m = 39000 kg
Height of the car, h = 19 m
Spring constant of the spring, 
We need to find the compression in the spring in stopping the ore car. It can be done by balancing loss in gravitational potential energy and the increase in elastic energy. So,
x is the compression in spring
So, the compression in the spring is 5.88 meters.
Answer:
open cluster. globular cluster. eclipsing binary
Utility companies charge based on consumption in kWh. Range of approximately 3 to 10 cents per kWh (rates vary by locale)
So consumption is directly proportional to watts of the load.
A 30 watt light bulb running for 100 hrs
would cost half of what a 60 watt bulb burning for the same time frame.
30 x 100= 3 KWh
60 x 100= 6 kWh
So use LED lights that give same lumens for much less watts of power
