Fluid Mechanics and Pressure Concepts

This video tutorial covers various physics problems related to density, atmospheric force, ocean pressure, hydraulic lifts, buoyant force, fluid dynamics, and spring mechanics. It provides step-by-step solutions and explanations, emphasizing the importance of understanding fundamental concepts and applying formulas correctly. The video is designed to help students prepare for their college physics final exam by practicing problem-solving skills.

What is the density of a fluid if its mass is 135 grams and its volume is 170 milliliters?

• 1.000 grams per milliliter

• 0.794 grams per milliliter

• 0.500 grams per milliliter

• 1.200 grams per milliliter

How do you convert a density of 0.794 grams per milliliter to kilograms per cubic meter?

• Multiply by 100

• Multiply by 1000

• Divide by 1000

• Divide by 100

What is the force exerted by the atmosphere on a 5 square meter surface at sea level?

• 2.5 x 10^6 newtons

• 1.0 x 10^5 newtons

• 5.0 x 10^5 newtons

• 3.0 x 10^6 newtons

What is the absolute pressure at a depth of 15 meters in seawater?

• 147,000 pascals

• 251,975 pascals

• 200,000 pascals

• 101,300 pascals

How does a hydraulic lift multiply force?

• By decreasing the area of the lift

• By increasing the speed of the fluid

• By distributing pressure evenly through the fluid

• By using a larger input force

What fraction of a block of wood with a density of 820 kg/m³ floats above water?

• 15%

• 25%

• 85%

• 50%

What happens to the speed of fluid in a pipe when the cross-sectional area decreases?

• The speed decreases

• The speed remains the same

• The speed increases

• The speed fluctuates

According to Bernoulli's principle, what happens to pressure as fluid speed increases?

• Pressure decreases

• Pressure increases

• Pressure fluctuates

• Pressure remains constant

What is the spring constant if a 300 N force compresses a spring by 0.35 meters?

• 1000.00 N/m

• 750.00 N/m

• 500.00 N/m

• 857.14 N/m

How fast will a block move when released from a spring with 52.5 J of potential energy?

• 10.5 m/s

• 25.5 m/s

• 15.5 m/s

• 20.5 m/s