Use g = 10 m/s/s. You push a 30 kg stationary box across a rough surface with a sideway force of 80 N in the positive direction over a time of 4 seconds. The coefficient of kinetic friction is 0.20. Let the direction to the right be positive. Required:
a. What is the contribution from the push force to the total impulse?
b. What is the contribution from the friction force to the total impulse?
c. What is the total impulse given to the box?
d. What is the final velocity of the box?

Consider two metallic rods mounted on insulated supports. one is neutral, the other positively charged. you bring the two rods close to each, but without contact, and briefly ground the the neutral rod by touching it with your hand. show answer correct answer what would be resulting charge (if any) on the initially neutral rod

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s