Technician A states that variable valve timing (VVT) is used on some diesel engines to delay the closing of intake valves on the compression stroke. Technician B states that VVT is used to open the intake valves early during the power stroke. Who is correct

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?