The horizontal surface on which the block of mass 5.4kg slides is frictionless. The force of 57N acts on the blockin a horizontal direction and the force of 171N acts on the block at an angle as shown below. What is the magnitude of the resulting acceleration of the block?

The plum pudding model of the atom states that ?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative