How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s²

Ahorizontal wire is tied to supports at each end and vibrates in its second-overtone standing wave. the tension in the wire is 5.00 n, and the node-to-node distance in the standing wave is 6.28 cm. (a) what is the length of the wire? (b) a point at an anti- node of the standing wave on the wire travels from its maximum upward displacement to its maximum downward displacement in 8.40 ms. what is the wire's mass?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?