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- 4. A frictional braking force is applied at an angle on an object. The frictional braking force is 500N, and the angle it is applied at is 160°. The object is moving forward through a displacement of 20m. Find the work done by the braking force to the nearest joule. = 500 N 160° d=20.0 m3. Suppose you have an object attached to a bizarre spring, initially located at x = 0, the equilibrium point of the force of the spring on the object is given by F₁ = kx, S where k is a spring constant. (a) You displace the object from x = 0 to ₁ > 0, holding the object steady at the beginning and end. What is the work done by the spring? What is the work done by you? (b) You let go of the spring and observe the object move from location. x₁ to x2. Is x2 less than or greater than ₁? (c) What is the kinetic energy of the object at x2? (d) Is this bizarre spring realistic? Explain.5. A force of 50 N is required to stretch a spring 10 cm beyond its natural length. How much work will be done stretching the spring 20 cm from its natural length?
- A 17 g bullet is accelerated in a rifle barrel81.5 cm long to a speed of 846 m/s.Use the work-energy theorem to find theaverage force exerted on the bullet while it isbeing accelerated.Answer in units of N.5. A person pulls an object of mass 40 kg as far as 20 m above a flat floor at a constant speed. The force used is directed 370 upwards horizontally. The coefficient of kinetic friction of the object with the floor is 0.20. Determine the work by the person, the work by the frictional force, and the total work on the object.6. Two blocks are connected by a very light string passing over a massless, frictionless pulley (see figure). Traveling at a constant speed, the 20.0-N block moves 65.0 cm to the right and the 12.0-N block moves 65.0 cm down. How much work is done a. on the 12.0-N block by gravity? b. on the 12.0-N block by the tension in the string? in total on the 12.0-N block? C. d. on the 20.0-N block by gravity? on the 20.0-N block by the tension in the string? on the 20.0-N block by the normal force? on the 20.0-N block by friction? in total on the 20.0-N block? e. f. g. h. 20.0 N 12.0 N
- 6. One end of a light inextensible string is attached to a block. The string is used to pull the block along a horizontal surface with a speed of 2 m s−1. The string makes an angle of 20° with the horizontal and the tension in the string is 25 N. Find the work done by the tension in a period of 8 seconds.Suppose the mass of a loaded elevator is 1300 kg. a) What force, in newtons, must be supplied by the elevator's cable to produce an acceleration of 0.715 m/s2 upwards against a 195-N frictional force? b) How much work, in joules, is done by the cable in lifting the elevator 21.5 m? c)What is the final speed, in meters per second, of the elevator if it starts from rest? d) How much work, in joules, was converted into thermal energy by friction? i just need part d because I keep getting the question wrong.1. A certain car can accelerate from rest to the speed v in T seconds. If the power output of the car remains constant, (a) how long does it take for the car to accelerate from v to 2v? (b) How fast is the car moving at 2T seconds after starting? Explain and draws.