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what will a spring scale read for the weight of a 55 kg woman in an elevator that moves upwards with constant speed of 6.0 m/s

Show that change in kinetic energy due to friction is given by ∆K = − f k d where k f is friction acting on an object and d is the length of the path followed by an object

-A noisy grinding machine in a factory produces a sound intensity of 1.00 * 10 ^ 5 * W / m2. Calculator (a) the decibel level of this machine, and (b) the new intensity level when a second, identical machine is added to the factory.

A bowler throws a bowling ball of radius R = 11 cm along a lane. The ball (see the figure below) slides on the lane with initial speed vcom,0 = 6.3 m/s and initial angular speed ω0 = 0. The coefficient of kinetic friction between the ball and the lane is 0.32. The kinetic frictional force f→k${\displaystyle {\overrightarrow{f}}_k}$ acting on the ball causes a linear acceleration of the ball while producing a torque that causes an angular acceleration of the ball. When speed vcom has decreased enough and angular speed φ has increased enough, the ball stops sliding and then rolls smoothly. During the sliding, what are the ball's (a) linear acceleration and (b) angular acceleration? (c) How long does the ball slide? (d) How far does the ball slide? (e) What is the linear speed of the ball when smooth rolling begins? Note that the clockwise direction is taken as negative.

A force of 250 N is applied to a hydraulic jack piston that is 0.01 m in diameter.  If the piston that supports the load has a diameter of 0.10 m, approximately how much mass can be lifted by the jack?  Ignore any difference in height between the pistons

A 12,600-kg railroad car travels alone on a level frictionless track with a constant speed of 18.0m/s. A 5350-kg load, initially at rest, is dropped onto the car. What will be the car’s new speed?

A solution contain 5 ppm of kmno4 has a transmittance of .36 measured in a 1 cm cell at 500 nm ,find out E

Charge Q is distributed uniformly throughout a spherical insulating shell. The net electrical flux in Nm2
/C 
through the outer surface of the shell is: 

A 15 - k_{B} block is dragged over a rough, horizontal surface by a constant force of 70 N acting at an ungle of 20 above the horizontal. The block is displaced 5 m, and the coefficient of kinetic friction is 0.3. Find the work done by (a) the 70-N force, (b) the force of friction, (e) the normal force, and (d) the force of gravity. (e) What is the net work done on the block!

horizontal block-spring system with the block on a frictionless surface has total mechanical energy E = 47.0 J and a maximum displacement from equilibrium of 0.240 m.

An open tank has a vertical partition and on one side contains gasoline with a density ${\displaystyle p=700\frac{kg}{m^3}}$ at a depth of 4m. Arectangular gate that is 4 m high and 2 m wide and hinged at one end is located in the partition. Water is slowly added to the empty side of the tank. At what depth, h, will the gate start to open?

The air in a bicycle tire is bubbled through water and collected at ${\displaystyle {25}^{\circ }C}$. If the total volume of gas collected is 5.45 L at a temperature of ${\displaystyle {25}^{\circ }C}$ and a pressure of 745 torr, how many moles of gas were in the bicycle tire?

 
When a gas is taken from a to c along the curved path in the figure (Figure 1) , the work done by the gas is W = -40 J and the heat added to the gas is Q = -140 J . Along path abc, the work done by the gas is W = -50 J . (That is, 50 J of work is done on the gas.) 
I keep on missing Part D. The answer for part D is not -150,150,-155,108,105( was close but it said not quite check calculations) 
Part A 
What is Q for path abc? 
Express your answer to two significant figures and include the appropriate units. 
Part B 
f Pc=1/2Pb, what is W for path cda? 
Express your answer to two significant figures and include the appropriate units. 
Part C 
What is Q for path cda? 
Express your answer to two significant figures and include the appropriate units. 
Part D 
What is Ua?Uc? 
Express your answer to two significant figures and include the appropriate units. 
Part E 
If Ud?Uc=42J, what is Q for path da? 
Express your answer to two significant figures and include the appropriate units.

Part A Suppose a uniform slender rod has length L and mass m. The moment of inertia of the rod about about an axis that is perpendicular to the rod and that

Water at a pressure of ${\displaystyle 3.00\times {10}^5}$ Pa flows through a horizontal pipe at a speed of 1.00 m/s. the pipe narrows to 1/4 its original diameter. Find the following: 
A. The flow speed in the narrow section 
B. the pressure in the narrow section

A 45-g piece of ice at 0 degree C is added to a sample of water at 8 degrees C. All of the ice melts and the temperature of the water decreases to 0 degree C. How many grams of water were there in the sample?

An ice cube tray of negligible mass contains 0.315 kg of water at ${\displaystyle {17.7}^{\circ }}$. How much heat must be removed to cool the water to ${\displaystyle {0.0}^{\circ }}$ and freeze it?