You are riding in a school bus. as the bus rounds a flat curve at constant speed, a lunch box with a mass of 0.470 kg suspended from the ceiling of the bus by a string of length 1.75 m is found to hang at rest relative to the bus when the string makes an angle of 30.0 ∘ with the vertical. in this position the lunch box is a distance 49.0 m from the center of curvature of the curve.

Here as we know that

m = mass of the box = 0.470 kg

L = Length of the string = 1.75 m

r = radius of the path = 49 m

= angle of the thread

Now from the condition of equilibrium of lunch box with respect to bus we can say

now divide the above two equations

solving the above equation for velocity

positive reinforcement? ?

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods