Arock is thrown straight up into the air. at the
highest point of the rock’s path, the magnitude of
the net force acting on the rock is
(1) less than the magnitude of the rock’s weight,
but greater than zero
(2) greater than the magnitude of the rock’s
weight
(3) the same as the magnitude of the rock’s
weight
(4) zero

Find the vertex(use the completing the square method), findthe x- and y-intercepts, and sketch the graph offunction. y = 2x2 + 4x - 1

In a good thermo flask the main cause of heat loss is

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j. b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.