On a summer afternoon, the sand on the beach can get very hot. when you step on the sand in bare feet, you can burn yourself.
which of the following sentences best describes how this happens?
heat from the sun is transferred to the sand without direct contact. this heat is then transferred to your feet without direct contact.
heat from the sun is transferred to the sand without direct contact. this heat is then transferred to your feet by direct contact.
heat from the sun is transferred to the sand by direct contact. this heat is then transferred to your feet by direct contact.
heat from the sun is transferred to the sand by direct contact. this heat is then transferred to your feet without direct contact.

Ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.