A 8.3 kg block is connected to a light spring with k = 214 N/m on a horizontal rough (Hs = 0.14, Pk = 0.345) surface. The spring is initially at its equilibrium position and the block is at rest. Nadia then comes along and pulls the block horizontally and stretches the spring out. When she stretches the spring out by 32 cm, she holds the block there at rest. How much work (J) did she do on the block from when she first started pulling? %3D %3D Give answer out to second place past the right of the decimal. No units necessary. Nadia pulls the block rough

A box of mass 12.0 kg begins at rest, and is accelerated at a rate of 1.5 m/s2 by a force F for 10.0 seconds. What is the work done by the force F?

A 70 kg rollerblader skates across a skating rink floor. The graph below shows the net external force component F cos(?) along the displacement as a function of the magnitude of the displacement d. Determine the following.   (a) the work done (in J) by the net force component F cos(?) acting on the rollerblader as he moves from 0 to 5.0 m   (b) the work done (in J) by the net force component F cos(?) acting on the rollerblader from 5.0 m to 10.0 m

A 54-kg box is being pushed a distance of 7.2 m across the floor by a force  whose magnitude is 167 N. The force  is parallel to the displacement of the box. The coefficient of kinetic friction is 0.20. Determine the work done on the box by each of the four forces that act on the box. Be sure to include the proper plus or minus sign for the work done by each force.

In the figure, a block of mass m = 4.00 kg slides head on into a spring of spring constant k = 230 N/m. When the block stops, it has compressed the spring by 8.40 cm. The coefficient of kinetic friction between block and floor is 0.480. While the block is in contact with the spring and being brought to rest, what are (a) the work done by the spring force and (b) the increase in thermal energy of the block-floor system? (c) What is the block's speed just as the block reaches the spring? (a) Number -0.81 (b) Number 1.6 (c) Number i -1.1 Units J Units J Units m/s

Your answer is partially correct. The (non-conservative) force propelling a 1.10 x 10-kg car up a mountain road does 7.50 x 106 J of work on the car. The car starts from rest at sea level and has a speed of 26.0 m/s at an altitude of 2.20 x 102 m above sea level. Obtain the work done on the car by the combined forces of friction and air resistance, both of which are non-conservative forces. Number 4757000 Units eTextbook and Media Hint Save for Later Attempts: 4 of 10 used Submit Answer h 77% 74°F Mostly 画 Home End Insert F5 F6 F7 F8 De F9 F10 F1 F12 % Bac 7 8 R Y U | G H J K L VBN M

A 1.70 kg block moving with an initial speed of 1.09 m/s slides on a rough horizontal surface until it encounters a spring with a spring constant of 955 N/m. The block comes to rest momentarily after compressing the spring a maximum distance of 2.30 cm. Find the work done by friction during this process. (a) -0.757 J (b) -21.0 J (c) -1.01 J (d) -0.253 J (e) -15.8 J

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.4x 10“ kg, and the force causes its speed to change from 7200 to 5100m/s. (a) Whát is the work done by the force? (b) If the asteroid slows down over a distance of 2.2x 106 m determine the magnitude of the force. (a) Work = i (b) F = i Save for Later Attemnts: 0 of 5 used

Starting from rest, a 1.7x104 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.35 N on it. This force does 2.7x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground? (b) How far upward does the flea move while it is pushing off? Ignore both air resistance and the flea's weight. (a) Number i (b) Number i Units Units

Suppose that a certain spring has spring constant k = 0.08 N/m (that’s Newtons per meter). How much work must be done to stretch the spring by 0.5 m past its equilibrium point?  Your answer will end up in units of N*m .