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1. Find the pressure increase in the fluid of a syringe when a

nurse applies a force of 42N to the syringe’s circular piston, which has a radius of 1.1cm = 0.011m.           

     2. If the temperature on one thermometer is  and the other

         is ,

        To the nearest ,

  • What is the temperature difference?
  • What would be the answer if the temperature difference is in ? 
  • a) Calculate the absolute pressure at an ocean depth of 1,060m.
  • Along a highway water is pumped through a straight
  • The small piston of a hydraulic lever has a diameter of 5cm.

Assume the density of seawater is 1024kg/m^3 and the air above exerts a pressure of 101.3kPa.

b) What Force does this pressure exerts on an area of 1.5m^2?

horizontal underground  pipe. The water enters one end at a speed of 7.2 m/s through an inlet radius of 0.05m and exits under a pressure of 0.06 atm through an outlet radius of 0.03m. 

  • What is the speed of the water at the other end?
  • What is the pressure at the inlet?
  • What is the flow rate? The volume of water per sec.

Recall: Flow rate = AV   (A: area,  V: velocity)

            Density of water = 1,000 kg/m^3

The large piston has a diameter of 50 cm.

  • What weight on the small piston will support 15 xN on the large?
  • What distance should the small piston move to raise the larger 2 cm?

1.A wheel rotates with a constant angular acceleration of 3.50 rad/s2. If the angular speed of the wheel is 2.00 rad/s at ti = 0 (initially), 

                 (a) Through what angle does the wheel rotate in 2.00 s? 

                 (b) What is the angular speed at t = 2.00 s? 

  • The wheel of a grinder is a 0.8 kg disk with a radius of 0.04 m.

It spins uniformly to rest from 1400 rpm in a time of 4s.

a) Find the Moment of Inertia

b) How large is the frictional torque required to slow it motion?

Note: the moment of inertia of a disk is  2 attachmentsSlide 1 of 2

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Medgar Evers College – CUNY Department of Physics and Computer Science Intro to Physics 205 Spring 2021– Prof. W. Smith EXAM #4 Wed. 4/21/2021 Submit on Wed. 4/21 no later than 12:30 pm Answer All questions below. Please provide clear legible solutions. Be neat 1. Find the pressure increase in the fluid of a syringe when a nurse applies a force of 42N to the syringe’s circular piston, which has a radius of 1.1cm = 0.011m. A = pr2 2. If the temperature on one thermometer is 300 C and the other is 110 F , To the nearest 0 C , a) What is the temperature difference? b) What would be the answer if the temperature difference is in 0 F ? 3. a) Calculate the absolute pressure at an ocean depth of 1,060m. Assume the density of seawater is 1024kg/m^3 and the air above exerts a pressure of 101.3kPa. b) What Force does this pressure exerts on an area of 1.5m^2? 4. Along a highway water is pumped through a straight horizontal underground pipe. The water enters one end at a speed of 7.2 m/s through an inlet radius of 0.05m and exits under a pressure of 0.06 atm through an outlet radius of 0.03m. a) What is the speed of the water at the other end? b) What is the pressure at the inlet? c) What is the flow rate? The volume of water per sec. Recall: Flow rate = AV (A: area, V: velocity) 1atm =1×105 N / m2 Density of water = 1,000 kg/m^3 5. The small piston of a hydraulic lever has a diameter of 5cm. The large piston has a diameter of 50 cm. a) What weight on the small piston will support 15 x 103N on the large? b) What distance should the small piston move to raise the larger 2 cm? Medgar Evers College Department of Physics and Computer Science Course: Phys 205 Exam #4 Part II Rotation Prof. W. Smith 1. A wheel rotates with a constant angular acceleration of 3.50 rad/s2. If the angular speed of the wheel is 2.00 rad/s at ti = 0 (initially), (a) Through what angle does the wheel rotate in 2.00 s? (b) What is the angular speed at t = 2.00 s? 2. The wheel of a grinder is a 0.8 kg disk with a radius of 0.04 m. It spins uniformly to rest from 1400 rpm in a time of 4s. a) Find the Moment of Inertia b) How large is the frictional torque required to slow it motion? 1 2 Note: the moment of inertia of a disk is I = Mr 2

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