In an 84 s interval. 959 hailstones strike a glass window of area 1.202 mº at an angle 44°

to the window surface. Each hailstone has a

mass of 5 g and speed of 11.4 m/s.

If the collisions are elastic, find the average

force on the window.

Answer in units of N.

Answer in units of N

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.