A 3600kg truck is parked on a 20 degree slope. How big is the friction force on the truck? The coefficient of static friction between the tires and the road is 0.90. Express your answer to two significant figures and include the appropriate units.

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers