all block of mass M equals 2.25 kg is fired with initial speed of loss equals 6 m/s along a horizontal section of a frictionless track as shown in the top portion of this figure. The block that moves along the frictionless semi circle vertical track and radius are equals 0.5m. 1) Determine the force exerted by the track on the block at A 2) The bottom of the track consists of a horizontal section of 15 m with friction. Determine the coefficient of kinetic friction between the block and the bottom portion of the track if the block just makes it to point B before coming to rest

A happy kangaroo leaps vertically upward at a time t = 0. At time t = 0.50 s the kangaroo is at a height of 2.0 meters above the ground. What is the speed and direction of motion of the kangaroo at this time (at t = 0.50 s)? Neglect air friction. 4.9 m/s downward 1.55 m/s upward O none of these 2.45 m/s downward 4.9 m/s upward 2.45 m/s upward

The two identical springs below are holding up the mass D. The springs each have a stiffness of 895 N/m. The mass of D is 18.8 kg. What was the unstretched length of the springs in m? A 45° D 45 C B 0.3 m

A helicopter with a mass of 10,000 kg takes off straight up at t=0. The thrust of the engine is defined given as a function of time: FT= 95 0.18t- (kN). Where t is in units of seconds. How fast is it rising and what is its elevation at t=4s?

in the 8-kg box reaches point A it has a speed v= 12 m/s (Figure 1) are B 9 m- x¹/2+yl/2=3 Part A Determine the normal force the box exerts on the surface when it reaches point B. Neglect friction and the size of the box Express your answer to three significant figures and include the appropriate units. N- 55.437 A N Provide Feedback O? Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining

360 N marine in basic training climbs a 15 m vertical rope at uniform speed in 8 minutes. His output power

graduate who joined the Navy as a pilot is about to take off in an F-15 (WF15 = 81,000 lb) from an aircraft carrier traveling at VA = 40 mph. The jet is launched from the catapult system (a connection just below the deck that assists the aircraft) with the force (Fcp) vs time curve shown that has points of F₁ = 1,000 lb at t₁ = 2 s and F₂ = 3,000 lb at t₂ = 5 s (the plane will reach the edge of the deck at t₂). The F-15 needs to be traveling at 170 mph to take off. Determine how much constant thrust (FTR) the engines must produce during the launch to reach this speed. F2 F₁ FCP t₁ VA t₂ FTR t (s)

Solve the problem

A 1.0 kg block is pushed 1.0 m at a con- stant velocity up a vertical wall by a constant force applied at an angle of 30.0° with the horizontal, as shown in the figure. The acceleration of gravity is 9.81 m/s². 1 kg 1 m Drawing not to scale. If the coefficient of kinetic friction between the block and the wall is 0.30, find a) the work done by the force on the block. Answer in units of I Answer in units of J 30° part 2 of 3 b) the work done by gravity on the block. Answer in units of J. Answer in units of N part 3 of 3 c) the magnitude of the normal force be- tween the block and the wall. Answer in units of N.

3-B Problem 4 The dredger is loading sand (SG = 2.6) onto a barge. The sand leaves the dredger pipe at 1.2 m/s with a weight flux of 3780 N/s. Estimate the tension on the mooring line caused by this loading process. Ans. 404.8 N 30°