Arubber ball weighs 49 n.. a) what is the mass of the ball? ( 5.0 kg). b) what is the acceleration of the ball if an upward force of 69 n is applied? ( 4.0 m/s/s). for a) i used the equation w = fg = mg, which becomes 49 = m(9.8). this approximates m to 5.0 kg.

for b) i used the equation
σfy=fa−w=ma
which becomes 69-49 = 20 n.
i then use equation f = ma which becomes 20 = 5.0a, which makes a
4.0m/s2

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.

What conclusion can be made based on the temperature of soil when the light hits the soil at 0°, 45°, and 90° angles in section 2 of the experiment? did your results support your hypothesis? why or why not?