##### A hydraulic press for compacting powdered samples has a large cylinder which is 10.0 cm in diameter

A hydraulic press for compacting powdered samples has a large cylinder which is 10.0 cm in diameter, and a small cylinder with a diameter of 2.0 cm. A lever is attached to the small cylinder as shown in (Figure 1). The sample, which is placed on the large cylinder, has an area of 4.0 cm2.

What is the pressure on the sample if F = 320N is applied to the lever?

Express your answer to two significant figures and include the appropriate units.

In: Physics

##### A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque.

A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that itis 1.20×104 $$\rm Pa$$, while in the region of blockage it is 1.15×104 $$rm Pa$$. Furthermore, she knows that blood flowing through the normal artery just before the point of blockage is traveling at 30.0 $$rm cm/s$$, and the specific gravity of this patient's blood is 1.06. What percentage of the cross-sectional area of the patient's artery is blocked by the plaque?

In: Physics

##### Water flows steadily from an open tank as shown in the figure

Water Flowing from a Tank

Water flows steadily from an open tank as shown in the figure. (Figure 1) The elevation of point 1 is $$10.0 \mathrm{~m},$$ anc the elevation of points 2 and 3 is $$2.00 \mathrm{~m}$$. The crosssectional area at point 2 is $$4.80 \times 10^{-2} \mathrm{~m}^{2} ;$$ at point 3 where the water is discharged, it is $$1.60 \times 10^{-2} \mathrm{~m}^{2}$$. The cross-sectional area of the tank is very large compared with the cross-sectional area of the pipe.

Part A

Assuming that Bernoulli's equation applies, compute the volume of water $$\Delta V$$ that flows across the exit of the pipe in $$1.00 \mathrm{~s}$$. In other words, find the discharge rate $$\Delta V / \Delta t$$.

$$\frac{\Delta V}{\Delta t}= \mathrm{~m}^{3} / \mathrm{s}$$

In: Physics

##### Find p1 the gauge pressure at the bottom of tube 1

A pair of vertical, open-ended glass tubes inserted into a horizontal pipe are often used together to measure flow velocity in the pipe, a configuration called a Venturi meter. Consider such an arrangement with a horizontal pipe carrying fluid of density $$p$$. The fluid rises to heights $${h_{1}}$$ and $${h_{2}}$$ in the two open-ended tubes (see figure). The cross-sectional area of the pipe is A1 at the position of tube 1, and $${A_{2}}$$ at the position of tube 2.

Part A.Find $${p_{1}}$$, the gauge pressure at the bottom of tube 1. (Gauge pressure is the pressure in excess of outside atmospheric pressure.)

Express your answer in terms of quantities given in the problem introduction and $${g}$$, the magnitude of the acceleration due to gravity.

Part B.Find $${v_{1}}$$, the speed of the fluid in the left end of the main pipe.

Express your answer in terms of $${h_{1}},{h_{2}}, g,$$ and either $${A_{1}}$$ and $${A_{2}}$$ or $$\gamma$$, which is equal to $$\frac{A_{1}}{A_{2}}$$

In: Physics

##### What does the top pressure gauge in the figure read?

What does the top pressure gauge in the figure read?

In: Physics

##### A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm.

A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. Liquid flows through the first segment at a speed of 4.0m/s.

A: What is the speed in the second segment?m/s

B: What is the speed in the third segment?m/s

C: What is the volume flow rate through the pipe?L/s

In: Physics

##### To determine an athlete's body fat, she is weighed first in air and then again while she's completely underwater.

To determine an athlete's body fat, she is weighed first in air and then again while she's completely underwater. It is found that she weighs 690 N when weighed in air and 48.0 N when weighed underwater. What is her average density?

In: Physics

##### A flask of water rests on a scale that reads 100 N. Then, a small block of unknown material is held completely submerged in the water.

A flask of water rests on a scale that reads 100 N. Then, a small block of unknown material is held completely submerged in the water. The block does not touch any part of the flask, and the person holding the block will not tell you whether the block is being pulled up (keeping it from falling further) or pushed down (keeping it from bobbing back up).

The experiment is repeated with the six different blocks listed below. In each case, the blocks are held completely submerged in the water.
 Mass (g) Volume (cm3) A 100 50 B 100 200 C 200 50 D 50 100 E 200 100 F 400 50

Part B
Rank these blocks on the basis of the scale reading when the blocks are completely submerged.
Rank from largest to smallest. To rank items as equivalent, overlap them.

Part C
If the blocks were released while submerged, which, if any, would sink to the bottom of the flask?
Enter the correct letters from the table in alphabetical order without commas or spaces (e.g., ABC).

In: Physics

##### A U-shaped tube, open to the air on both ends, contains mercury.

A U-shaped tube, open to the air on both ends, contains mercury. Water is poured into the left arm until the water column is 11.3cm deep.
How far upward from its initial position does the mercury in the right arm rise?(In mm)

In: Physics

##### the container shown in (figure 1) is filled with oil. it is open to the atmosphere on the left.

The container shown in (figure 1) is filled with oil. It is open to the atmosphere on the left.

What is the pressure at point A?
Pa=                           kPa
What is the pressure difference between points A and B?
Pb-Pa=                          kPa
What is the pressure difference between points A and C?
Pc-Pa=                           kPa

In: Physics

##### Archimedes measured the weight of the crown in air to be 11.8 N and its weight in water to be 10.9 N. Was it pure gold?

It is said that Archimedes discovered the buoyancy laws when asked by King Hiero of Syracuse to determine whether his new crown was pure gold (SG = 19.3). Archimedes measured the weight of the crown in air to be 11.8 N and its weight in water to be 10.9 N. Was it pure gold?

In: Mechanical Engineering

##### Which of the following coenzymes participate in the reactions of the pyruvate dehydrogenase complex?

Which of the following coenzymes participate in the reactions of the pyruvate dehydrogenase complex?

• 1) thiamine pyrophosphate
• 2) lipoic acid
• 5) CoA

In: Biology

##### Which of the following is NOT one of the three stages of respiration?

Which of the following is NOT one of the three stages of respiration?

• The oxidation of acetyl-CoA to who molecules of CO2
• electron transport and oxidative phosphorylation
• the conversion of pyruvate to acetyl-CoA
• the preparation of pyruvate

In: Biology

##### Which of these is NOT a product of the citric acid cycle?

Which of these is NOT a product of the citric acid cycle?

• CO2
• acetyl CoA
• ATP

In: Biology

##### Which of these enters the citric acid cycle?

Which of these enters the citric acid cycle?

• G3P
• glucose