Ē 3. A 10-kg box is pulled by a 90-N force on
a frictionless surface to move it with an
acceleration of a = 8 m/s2 along x- axis.
a) Calculate the x- component of F.
b) Calculate the normal force on the box.

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.