You start with spring that's already been stretched an unknown amount from equilibrium. After stretching it an additional 2.0 cm, you find that the total potential energy associated with the spring is 18 J. You stretch it another 2.0 cm, and now the potential energy rises to 25 J. Find the spring constant. Express your answer with the appropriate units. ? k = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 25 attempts remaining • Part B Find the initial stretch. Express your answer with the appropriate units. HẢ Value Units

You start with spring that's already been stretched an unknown amount from equilibrium. After stretching it an additional 2.0 cm, you find that the total potential energy associated with the spring is 18 J. You stretch it another 2.0 cm, and now the potential energy rises to 25 J. Find the spring constant. Express your answer with the appropriate units. ? k = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 25 attempts remaining • Part B Find the initial stretch. Express your answer with the appropriate units. HẢ Value Units

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter10: Work, Energy And Machines

Section: Chapter Questions

Problem 59A

See similar textbooks

Similar questions

Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30 of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is about 140 Mi/gal.) (a) What is the magnitude of the force exerted to keep the car moving at constant speed? (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s?
(a) What is the average useful power output of a person who does 6.00106J of useful work in 8.00 h? (b) Working at this rate, how long will it take this person to lift 2000 kg of bricks 1.50 m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.)
. In the annual Empire State Building race, contestants run up 1,575 steps to a height of 1,050 ft. In 2003, Australian Paul Crake completed the race in a record time of 9 min and 33 S, Mr., Crake weighed 143 lb (65 kg) , (a) How much work did Mr., Crake do in reaching the top of the building? (b) What was his average power output (in ft-lb/s and in hp)?
Suppose a force of 60 N is required to stretch and hold a spring 0.1 m from its equilibrium position. a. Assuming the spring obeys Hooke's law, find the spring constant k. b. How much work is required to compress the spring 0.6 m from its equilibrium position? c. How much work is required to stretch the spring 0.2 m from its equilibrium position? d. How much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. k= (Type an integer or a decimal.) b. Set up the integral that gives the work done in compressing the spring 0.6 m from its equilibrium position. Use decreasing limits of integration. (Type exact answers.) Find the work done in compressing the spring. The work is (Type an integer or a decimal.) c. Set up the integral that gives the work done in stretching the spring 0.2 m from its equilibrium position. Use increasing limits of integration. dx (Type exact answers.) Find the work done in stretching the spring. The…
a) The acceleration of a 5.0 kg box is 2.5 ms?. when a horizontal force is applied across a surface having a coefficient of friction of 0.5, as shown in Figure 3. a = 2.5 ms-2 7 kg Hk = 0.5 Figure 3 Find the work done over a distance of 25 cm by ix. the horizontal force the frictional force, and Х. xi. the net force. xi. what is the change in kinetic energy of the box?
the mass of the object is m=0.2kg the spring is compressed at a distance of X=4cm when the mass is released it slides up to the height of 10cm. and then it turns around and slides back down. find the spring constant, K of the spring? WwwM A note: that the equation for spring potential energy is (1/2*k*x2). and gravitational potential energy is m*g*h. also, the conservation of mechanical energy is MEi=MEf.
ACTIVITY 5 ODL STEM 12A The energy consumed by a o.8okW electric drill is 45 kJ in 1. _hour/s. What is the speed of a 3.okg object when its kinetic energy is 5.0J? Express your answer in ft/s (feet/second) 2. 3. What is the speed of the same object in #2 if the object has a weight of o.225|b? What is the ratio of energy consumption of a person who moves minimally when his/her requirement in moving is 8 MJ of energy per day. Express your answer in Watts. 4.
Review I Cons An ideal spring stores potential energy Uo when it is compressed a distance xo from its uncompressed length. Part A In terms of U, how much energy does the spring store when it is compressed twice as much? Express your answer in terms of Un. ? Uel %D Submit Request Answer Part B In terms of Uo, how much energy does the spring store when it is compressed half as much? Express your answer in terms of Ug. ? Uel = Submit Request Answer
elp O Tell me what you want to do Editing v Dv Av A 三くmく Styles v Find a Reuse Files 6. What distance is a rock from the floor if the rock contains 175 Joules of potential energy and has a mass of 25 kg? 7. An car is sitting on a hill which is 20 m higher than ground level. Find the mass of the car if it contains 362,600 J of potential energy. 8. An car is sitting on a hill which is 30 m higher than ground level. Find the mass of the car if it contains 636,000 J of potential energy- 9. An car is sitting on a hill which is 50 m higher than ground level. Find the mass of the car if it contains 800,500 J of potential energy. 10.Calculate the kinetic energy of a rock that has a mass of 55 kg rolling down a hill with a velocity of 8 m/s.
Question: 1. Suppose that the elevator is broken in the building n which you work and you have to climb 9 stories. -a height of 45m above ground level. How many extra calories will this external work cost you if your mass is 70 kg and your body work at 15% efficiency? 2. A 70 kg hiker climbed a mountain 1000 m high. He reached the peak in 3 hr. A. Calculate the external work done by the climber. B. Assuming the work was done at a steady rate during the 3 hr period. Calculate the power generated durir the climb. C. Assuming the average O, consumption during he climb was 2 liters/min (corresponding to 9.6 kcal/min), find the efficiency of the hiker's body. D. How much energy appeared as heat in the body?
This is a multi-part problem. Please answer all parts here. A 2 kg object is moving along the x-axis, subject to the potential energy shown. At x =0 m, the object is moving at 3 m/s. 20 J 10J 0 m 5 m a What is the object's total energy? b. How fast is the object moving at x = 5 m? EtL CE arch
A man pushes a cart 25m at a constant speed on ground level, against a 36N frictional force. He pushes in a direction that is 28.5 degrees below the horizontal. A. What is the work done by gravity, friction, and the man? B. Find the force in N that the shopper exerts using energy consideration. (give your answer as a magnitude) C. What is the total work done by all forces on the cart?