How fast it is after 2 seconds?
How long will it take if the final velocity is 25 m/s?
The initial velocity of a car, vi, is 45 km/h in the positivex direction. The final velocity of the car, vf, is 66 km/h indirection that points 75 degrees above the positive x axis.
a) sketch the vectors -vi, vf and change in v. (b) findthe magnitude and direction in change of velocity.
For b..my answer was -37.93 km/h and -88.41 degrees for direction.
A relief airplane is delivering a food package to a group of people stranded on a very small island. The island is too small for the plane to land on, and the only way to deliver the package is by dropping it. The airplane flies horizontally with constant speed of 220 mph at an altitude of 800 m. The positive x and y directions are defined. For all parts, assume that the "island" refers to the point at a distance D from the point at which the package is released, as shownin the figure. Ignore the height of this point above sea level. Assume that the acceleration due to gravity is g=9.80 .
A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. The amplitude of the motion is 0.240 m and the period is 3.08 s.
a. What is the acceleration of the block when x = 0.160 m?
Two objects, with masses and , attract each other with force . If the mass of increased by a factor of two then the new gravitational force would be:
a. When the displacement of a mass on a spring is A, what fraction of the mechanical energy is kinetic energy and what fraction is potential energy? b. At what displacement, as a fraction of A, is the energy half kinetic and half potential?