Please help me with these questions for my lab-report. PREETY PLEASE. URGENT HELP. ASAP.

THE QUESTIONS UNDER DISCUSSION.
PS. THE TOPIC IS SIMPLE MACHINES
the questions under discussion i need help with.

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

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work

What are the similarities & differences between a thermistor and a light dependent resistor in physics?