A pair of wedges is used to lift a crate as shown in The crate weighs 4000 lb, the wedge angle e is Fig. 18°, and the coefficient of friction is 0.15 at all surfaces. The weight of the wedges is negligible. Determine The force P necessary to insert the wedge. W

The crate has a weight of W = 350 lb and the %3D coefficient of static Friction between the crate and the ground is µs = 0.3. If the angle %3D e = 45° and P = 100 lb, the normal force 'N' exerted on the crate is. Select one: a. 83.79-lb b. 70.71-lb С. О d. 279.29-lb

Question in photo. Thank you

A 60 Kg crate is resting on top of a 45 Kg crate as shown in figure below. The top crate is attached to a wall by a cord, and a rope attached to the bottom crate passes around two fixed pegs. The coefficient of friction between the two crates is 0.4; between the crate and the floor is 0.5; and between the rope and the pegs is 0.3. Determine the minimum force Pmin needed to cause move the bottom crate. 60 kg 45 kg