Two identical tubes have fluid flowing through them at the same speed. in one tube, the fluid is air, and in the other tube, the fluid is fresh water.

density (kg/m3)(kg/m3) viscosity (pa⋅s)(pa⋅s)
water at 20°c20°c 998998 1.002×10−31.002×10−3
air around 20°c20°c 1.231.23 1.808×10−51.808×10−5
in which tube is viscosity more important?

the tube with water

the tube with air

viscosity is equally important in each tube

not enough information given to decide

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates