The drawing shows a 26.1-kg crate that is initially at rest. note that the view is one looking down on the top of the crate. two forces, and , are applied to the crate, and it begins to move. the coefficient of kinetic friction between the crate and the floor is k = 0.347. determine the (a) magnitude and (b) direction (relative to the x axis) of the acceleration of the crate.

The momentum of a car travelinv in a straight line at 20 m/s is 24,500kg·m/s. what is the cars mass?

Acarpenter is driving a 15.0-g steel nail into a board. his 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail. what is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? the specific heat of steel is 448 j/kg ∙ k. a) 2.7 k b) 1.8 k c) 7.7 k d) 8.1 k e) 3.6 k

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs.