Question

explain please

E. arctan(a/vr) 11. In what aituations, if ang, can force? body move in a eircular peth at coatant ped withoal eeatripetal A. None. 0) In certain special non-inertial frames C. In all non-inertial frames. ex, D. In all inertial frames. E Always 12. A loaded penguin sled weighing 80 N reeta on a plane inclined at angle 20 to the horieontal (ee Egure below) Between the sled and the plane, the coefficieet of static friction in 0.25, and the coefficient of kinetiec friction is 0.15. A. What is the least magnitude of the force parallel to the plane, that will prevent the sled from. slipping down the plane? B. What is the minimum magnitude F that will start the sled moving up the plane? C. What value of F is required to move the sled up the plane at constant velocity? 13. A 1000 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the frictional force between boat and water is proportional to the speed e of the boat: f- T00, where u is in meters per second and f is in newtons. Find the time required for the boat to slow to 45 km/h. 14/ A block of mass m is lving on a block of mass M, lying on a horizontal frictionless surface as shown below. If the coefficient of static friction between the two blocks is i, M A. What is the minimum horizontal force F that must be applied to block of mass m so that it moves over block of mass M? B. If a force F(> u.ma) is applied to block m, what is the acceleration with which block M will move on the horizontal surface? (Here u is the coefficient of kinetic friction between block M and the horizontal surface.) 15. Calculate the ratio of the drag force on a jet flying at 1000 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at half that speed and altitude.The density of air is 0.38 kg/m at 10 km and 0.67 kg/m3 at 5.0 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C. 16. A boy is seated on top of a hemispherical mound of ice of radius R. He is given a little push and he starts sliding down the ice. Assuming the ice is frictionless, At what height will the boy leave the ice?

Answer 1

Pace No. Date: / Solution msis.R imimun fore to prevent So min o (San20-0.25 los20) min Pmn R.56 N teneteney so the tactin fosce rst the SLip doron Aus to weerd weis inupwewd diveckibn move sted upuer d uant t0 Now we So the mckn force wiu aet down wend So Nous min Force to Sted stat up the plaune Svines

Page No. Date: fminz g istosi) Shet us fmin 4.1S N the nin force abtened by fert a smamestamount up the piawe B exceeied he sted stewts with conctewat velocity So' the anequived foree f is 4C-15 N