Question

1. A mass of 2.8 kg is suspended from the ceiling of an elevator by a...

1. A mass of 2.8 kg is suspended from the ceiling of an elevator by a rope. What is the tension in the rope when the elevator moves in the following ways?

(a) accelerates upward at 1.2 m/s2

0 N 24.1 N 27.4 N 30.8 N

(b) accelerates downward at 1.2 m/s2

0 N 24.1 N  27.4 N 30.8 N

2. A toboggan with two riders has a total mass of 88.0 kg. A third person is pushing the toboggan with a force of 42.5 N at the top of a hill with an angle of 16°. The force of friction on the toboggan is 36.0 N. Which statement describes an accurate free-body diagram to represent the situation? (Choose one of the forces acting on the system with correct magnitude and direction.)

An arrow of magnitude 862 N points perpendicular to the slope of the hill.

An arrow of magnitude 6.50 N points down the slope of the hill.

An arrow of magnitude 78.5 N points down the slope of the hill.

An arrow of magnitude 862 N points straight down.