A physics professor is pushed up a ramp inclined upward at 30.0° above the horizontal as she sits in her desk chair, which slides on frictionless rollers. The combined mass of the professor and chair is 85.0 kg. She is pushed 2.50 m along the incline by a group of students who together exert a constant horizontal force of 600 N. The professor’s speed at the bottom of the ramp is 2.00 m/s. Use the work–energy theorem to find her speed at the top of the ramp.

Q: A flat belt is required to transmit 28 kW from a pulley of 1.3 m effective diameter running at 300…

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Q: A 0.70-kg block initially at rest on a frictionless horizontal surface is acted upon by a force of…

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Q: Water is flowing in a fire hose with a velocity of 1 m/s and pressure of 3.8 bar. At the nozzle the…

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Q: A car is accelerated from rest to 85 km/h in 10 s. Would the energy transferred to the car be…

A: The final velocity of the car is the same in both cases. From the work-energy theorem, Since the…

Q: 3/105 The small 0.2-kg slider is known to move from position A to position B along the…

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Q: How does the force exerted upward by the pulley change as the system begins accelerating? Why? Set…

A: When the acceleration of the system increases, the equation will become: As, when upward…

Q: A body is moved from an origin to new position by a constant force F. If this movement is detailed…

A:

Q: A box with a mass of 600 kg is dragged up an incline 12 m long and 4 m high by using a cable that is…

A: Given data *The mass of the box, m = 600 kg *The height of the box, h = 4 m *The incline length of…

Q: b) The minimum mass flow in kg/s required to maintain energy production of 152MW per turbine,…

A: Given Data P=152 MW H=375 m n=8

Q: If the car hits the brakes, how much frictional force will it experience? A wall is 50 m in front of…

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Q: .A centrifugal air compressor compresses air at the rate of 20 kg/min from 1 bar to 2 bar. The…

A: Given Data  Temperature at point 1 is :T1=20°C=293 K Temperature at point 2 is : T2=120°C=393 K…

Q: A crane is pulling a car, exerting a force F = 6072 [N] with the chain at an angle θ = 31 ° with the…

A: Consider the Free Body Diagram: Given:F=6072 Nθ=31°P=3362 Wattsx=6.4 m

Q: A mechanical shovel is digging sand, each load weighs 500 kgf, The shovel lifts each load to a…

A: Given        Weight, W =  500 kgf          Height, h = 15 m              Time, t = 1/2 min      Flow…

Q: A body of mass 15 kg is moving over a smooth surface, whose equation of motion is given by S=5t+2t.…

A: Please make sure provided options are correct.

Q: If the work done by a conservative force on a particle as it moves between two positions is –10 N·m,…

A: Conservative force and potential energy.

Q: The resistance to motion is given by R, = (0.011 + 0.000 06 V) Mg + 0.028 AV² %3D where M is the…

A:

Q: |(a) A drum is made to revolve about its centre by a falling mass as shown. Calculate the velocity…

A: Given data: R=0.4 mr=0.2 mk=0.3 mMdrum=15 kgMblock=12 kg Need to determine the velocity of the…

Q: A wind turbine has a blade length of 30 m. In a given day, average speed of wind for 5 hours is 9…

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Q: The diffuser in a jet engine is designed to decrease the kinetic energy of the air entering the…

A: P1= 100 kPaT1= 30∘C= 30+273 K= 303 KV1=350 m/sP2= 200 kPaT2= 90∘C= 90+273= 363 K   To find: Velocity…

Q: A box of mass 4 kg is being pushed horizontally on a rough surface by a 12 N force. Given that the…

A: Mass of the box = 4 kg Pushing Force on box = 12 N Constant speed of box = 2 m/s

Q: A loaded truck weighs 16(10^3)lb and accelerates uniformly on a level road from 15 ft/s to 30 ft/s…

A: Given Data The weight of the truck is: W=16×103 lb The velocity is: 15 ft/s The final velocity is:…

Q: Consider a 1200 kg car cruising steadily on a level road at 90 kph. Now the car starts climbing a…

A: GIVEN-             MASS OF CAR (m)= 1200 kg             SPEED OF CAR(v) =90km/hr…

Q: A damaged 1200-kg car is being towed by a truck. Neglecting the friction, air drag, and rolling…

A: Q Given Data:A damaged car of mass 1200kgTo Determine -a) Power required for constant velocity of…

Q: 30. A1 000-kg roller coaster car is initially at the top of a rise, at point . It then moves 135 ft,…

A: First of all, make a FBD of the diagram as shown below,

Q: 4. In an air motor cylinder the compressed air has an internal energy of 450 kJ/kg at the beginning…

A: Given, U1 = 450 kJ/kg U2 = 220 kJ/kg W = 120 kJ/kg Required :- Heat flow to or from the cylinder

Q: A0.2-kg rocket is launched from rest and rises 29 m above its starting point. In the process, 425 J…

A: Given     Mass, m = 0.2 kg   Height , h = 29 m

Q: In a standard wind turbine, the typical range of wind speed at which the wind turbine starts…

A: The typical range of wind speed for generating the power is equal to 3 m/s to 25 m/s or (0.83 km/hr…

Q: A pump forces 1 m3/min of water horizontally from an open well to a closed tank where the pressure…

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Q: A body is moved from an origin to new position by a constant force F. If this displacement is…

A: Given : R⇀=3i+3j (m)F⇀=20i+20j (N)

Q: 3. A ball is thrown vertically upward from the ground and a student gazing out the window sees it…

A: according to the given details in the question.

Q: A body of mass 15 kg moving with velocity of 2 m/s is acted upon by a force of 75 N for two seconds.…

A: Given, Mass = m = 15 kg Initial velocity = v1 = 2 m/s Force = F = 75 N Time of action = t = 2 s…

Q: A 20,000 kg train car traveling at 8 m/s crashes into a 30,000 kg train car at rest and the two cars…

A: Let us denote 20,000 kg train by subscript 1 and 30,000 kg train by subscript 2. Given, m1 = 20,000…

Q: #5) A person is pulling a 52 kg of box up the hill that has an angle 45° above the horizontal at…

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Q: 5. Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel as…

A: Heat added = 30 KJHeat lost = - 5 KJ

Q: Calculate the work required to be done to stop a car of 1400 kg moving at a velocity of 50 km/h

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Q: A truck hauls a trailer at 60 km/hour when exerting a steady pull of 600 N. If the work is done for…

A: Given, Velocity generated by force = V = 60 km/hr = 16.67 m/s Applied pull force = F = 600 N Time of…

Q: A piston cylinder shown below is connected with a paddle wheel coupled in a 120 Kg mass. The mass…

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Q: It is required to lift a 20,000 kg load to a height of 10m using a 25 HP engine. If the efficiency…

A: Given data : Mass to be lifted , m =20,000 kg                   Height of lift , h = 10 m…

Q: 1 For the car lift shown in the figure, determine the force required to be applied (F1), for the…

A: Though figure is not uploaded, it can be assumed (from the given data) that subscript 2 refers to…

Q: A 10-m, 20-kg chain hangs vertically from a cylinder attached to a winch. a. How much work is…

A: Given Length = 10 m Mass = 20 kg To find Work required to wind the chain Work required to wind the…

Q: Consider an insulated system with piston and cylinder arrangement in which Oxygen gas is present. If…

A: Given data: Change in internal energy ∆U=100 kJ Need to determine the work given on the gas.

Q: A helicopter of mass 1.40 × 10³ kg is descending vertically at 3.00 m/s. The pilot increases the…

A: Given data: Here, m represents the mass of the helicopter, u represents the initial velocity, v…

Q: If the frequency of the pump is halved, what will happen to the power consumed? P0 = initial power…

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Q: On flat ground, a 70 kg person requiresabout 300 W of metabolic power to walk at a steady pace of5.0…

A: Given details: m=70 kgP=300 Wvbiking=15 km/hvwalking=5 km/h Formula used: K.E.=12mv2

Q: To dramatize the loss of energy in an automobile, consider a car having a weight of 5000 lb that is…

A: Given Data⇒WeightW=5000 Lbsince g=32.2 fts2mass m=Wg=500032.2 speedv=35mihr1 mi =5280 ftconvert this…

Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.