Asingle mass (m1 = 4.4 kg) hangs from a spring in a motionless elevator. the spring constant is k = 275 n/m.
now, three masses (m1 = 4.4 kg, m2 = 13.2 kg and m3 = 8.8) hang from three identical springs in a motionless elevator. the springs all have the same spring constant given above.
finally, the elevator is moving downward with a velocity of v = -2.1 m/s but accelerating downward at an acceleration of a = -2.1 m/s2.
what is the magnitude of the net force on the middle mass?

Luke and carrie are driving down a straight section of the interstate at 70 mph in luke's new convertible. carrie is drinking a soda in the passenger seat. when she is done she tosses the bottle straight up in the air, just above the height of the car. what will happen to the bottle if air resistance is neglected? a. the bottle will land in carrie's lap. b. not enough information is given. c. the bottle will land on the interstate in front of the car. d. the bottle will land on the interstate behind the car.

To protect all four receptacles on a branch circuit that surrounds a swimming pool, you would install which of the following configurations? a. gfci feed-through receptacle at the end of the load's circuit b. gfci-terminated receptacle at the beginning of the load's circuit c. gfci feed-through receptacle at the beginning of the load's circuit and the other receptacles connected to the load side of that receptacle d. gfci-terminated receptacle at each end of the load's circuit

Explain what makes a passenger in a turning car slide toward the door. critical thinking