2. A block of mass 30.0 [kg] slides down from the top of the incline. The coefficient of kinetic friction between the block and the incline is μk 0.350. What is the total work done = on the block as it reaches the bottom of the incline? A. 1.46 [KJ] C. 2.28 [kJ] B. 1.71 [kJ] D. 2.47 [kJ] 40.0⁰ 10.0 m

Mountain climbers carry bottled oxygen when at very high altitudes, since the atmosphere contains less and less as you go higher up. a. Assuming that a mountain climber uses 3.92 liters of oxygen per minute, calculate how many liters of oxygen a climber would need for 11 h of climbing. (These are liters at sea level.) Note that only 40% of the inhaled oxygen is utilized; the rest is exhaled.  b.  How much useful work does the climber do, in joules, if he and his equipment have a mass of 97.5 kg and he gains 1150 m of altitude?  c. What is his efficiency for the 11-h climb? Assume his total energy consumption is 1370 W.

5. What is the kinetic energy of a box of mass 0.75 [kg] sliding on a frictionless surface at a constant speed of 3.00 [m/s]? A. 1.46 [J] B. 2.25 [J] C. 4.50 [J] D. 3.38 [J]

Q1. a. Distinguish between homogeneous and non-homogeneous equation. b.Find the work done in moving an object along a straight line from (3, 2, -1) to (2, -1, 4) in a forcefield given by F = 4i – 3j + 2k .

A 61.5-kg hiker starts at an elevation of 1200 m and climbs to the top of a peak 2750 m high. Part A What is the hiker's change in potential energy? Express your answer to three significant figures and include the appropriate units. ΔΡΕς = Submit Part B W min = Submit Part C What is the minimum work required of the hiker? Express your answer to three significant figures and include the appropriate units. O Yes O No Value Submit μA Request Answer ī μÅ Value Request Answer Units Can the actual work done be greater than this? Request Answer Units ? ?

6. Determine the approximate work rate (in Mets) for running on a treadmill at a speed of 5.0 mph and a 4% grade elevation. What is the total caloric cost (kcal) for 190 lb man exercising for 30 minutes at this workrate?

A man pulls a 25 kg box in a horizontal fashion with 60N of force over a surface with us = 0.15 and uk = 0.05. a. After pushing it for 10m, how much thermal energy is produced? b. What is the net work done on the system? Draw a FBD.

1. Calculate the work done on the suitcase by  F→. Express your answer with the appropriate units. 2. Calculate the work done on the suitcase by the gravitational force. Express your answer with the appropriate units. 3.Calculate the work done on the suitcase by the normal force. Express your answer with the appropriate units. 4. Calculate the work done on the suitcase by the friction force. Express your answer with the appropriate units. 5. Calculate the total work done on the suitcase. Express your answer with the appropriate units. 6. If the speed of the suitcase is zero at the bottom of the ramp, what is its speed after it has traveled 3.90 mm along the ramp? Express your answer with the appropriate units.

Are the following dimensionally homogeneous (these may not represent practical physical quantities)? A: B: P.t E F V P = power t = time E = energy A = area F = force = V = volume W = work = t A W. A² a. A and B b. A only O c. B only t Od. Neither A nor B

2. An object has 560 J of potential energy and 890 J of mechanical energy. How much kinetic energy does the object have?. ME = REHPE 560 560 330J= PE olog ertev 3. A slingshot rubber band with a spring constant of 850 N/m was stretched 0.33 m. A 0.4 kg rock was fired from the slingshot after it was released. a. Find the spring potential energy. PE =)2 kx? Z(850X.33) b. What is the kinetic energy of the stone once it was released? PEERE c. What is the velocity of the stone as soon as the slingshot was released?