7. What is the force of tension in a rope that spins a 250 g object in a vertical circle with a radius of 50 cm if the mass at the top of the loop is traveling at 3 m/s?

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.