What net external force (in N) is exerted on a 1400-kg artillery shell fired from a battleship if the shell is accelerated at 2.80 X 104 m/s2? (Enter the magnitude.) N What is the magnitude (in N) of the force exerted on the ship by the artillery shell? N
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- Suppose a car approaches a hill and has an initial speed of 120 km/h at the bottom of the hill. The driver takes her foot off of the gas pedal and allows the car to coast up the hill. Note: the 790-kg car with an initial speed of 120 km/h is observed to coast up a hill and stops at a height 21 m above its starting point. a.) What is the magnitude of the average force of friction, in newtons, if the hill has a slope 2.7° above the horizontal?An 95-g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 77 cm. Part A What is the speed of the arrow as it leaves the bow? Express your answer to two significant figures and include the appropriate units. V2 = μA Value Units ?A rifle with a barrel length of 60 cm fires a 14 g bullet with a horizontal speed of 350 m/s. The bullet strikes a block of wood and penetrates to a depth of 14 cm. You may need to review (Page 131). For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Ready for takeoff. Part A What resistive force (assumed to be constant) does the wood exert on the bullet? Express your answer with the appropriate units. fk = Submit LO Part B μÀ - 11812.5 N Previous Answers Request Answer X Incorrect; Try Again How long does it take the bullet to come to rest after entering the wood? Express your answer with the appropriate units. μA t = 0.000533 ? S ?
- Ⓒ Macmillan Learning A small block of mass m slides to the left on a frictionless, horizontal surface with speed u. Then, the block slides up a rough ramp that has an incline angle of a. The coefficient of kinetic friction between the ramp and box is μ. The acceleration due to gravity is g. What is the height h of the block when its speed up the ramp equals cu, where 0 < c < 1? h = Incorrect ₂² (1-c²) 2g+mg sin(a) CV Final position m Rough surface Initial position m Frictionless surfacePlease atleast answer this questionA block with weight 50 N stops on an inclined plane which has angle 0 = 30° to the horizontal. Two observers try to analyse the forces on the block with their preferred reference. Observer A uses coordinate (xẠ, YA) as his reference while observer B uses coordinate (Xg, Yg) as her reference(See figure 1). YA Observer A Block Observer B XA W XB Figure 1. (a) Decompose the weight, W and the normal force, Ñ in the coordinate system of observer A. (b) Decompose the weight, W and the normal force, Ñ in the coordinate system of observer B. (c) Determine the magnitude of friction obtained by A and B respectively if the block tends to slide down. (d) Are the two answers in part (c) same or different? What does the result imply?
- A car moving at 30 m/s crashes into a tree and stops in 0.3 s. Calculate the force the seat belt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 84 kg. (Enter the magnitude.) NBlock A has a mass of 3 kg and block B has a mass of 4.8 kg. They are in contact and slide over a frictionless horizontal surface. A force of 19 N acts on B as shown. F Find: mb a) the acceleration; m/s² b) the force on B due to A; N c) the net force on B; N ma d) the force on B due to A if the blocks are interchanged. NA rocket takes off from Earth's surface, accelerating straight up at 37.2 m/s2. Calculate the normal force (in N) acting on an astronaut of mass 81.4 kg, including his space suit. (Assume the rocket's initial motion parallel to the +y-direction. Indicate the direction with the sign of your answer.) ?N
- A rocket takes off from Earth's surface, accelerating straight up at 45.2m/s2. Calculate the normal force (in N) acting on an astronaut of mass 85.9kg, including his space suit. (Assume the rocket's initial motion parallel to the +y-direction. Indicate the direction with the sign of your answer.) NEarly test flights for the space shuttle used a "glider" (mass of 980 kg including pilot). After a horizontal launch at 600 km/h from a height of 3600 mm , the glider eventually landed at a speed of 210 km/h. part a What would its landing speed have been in the absence of air resistance? Part b What was the average force of air resistance exerted on it if it came in at a constant glide of 12 degrees to the Earth? can you please help with part b?An object of mass 0.77 kg is initially at rest. When a force acts on it for 2.9 ms it acquires a speed of 12.7 m/s. Find the magnitude (in N) of the average force acting on the object during the 2.9 ms time interval. (Enter a number.) N