Q: A barometer is used to measure atmospheric pressure. If the height of mercury in the barometer is 760 mm, what is the atmospheric pressure in Pascals? (Density of mercury $$\rho = 13,600 \ \text{kg/m}^3$$, $$g = 9.8 \ \text{m/s}^2)$$

$$1.03 \times 10^5$ \ \text{Pa}$$

Question 1

According to Newton's Universal Law of Gravity, what happens to the gravitational force between two masses if the distance between them is doubled?

Accepted Answer

The force is reduced to one-fourth.

Question 2

Which equation best describes the gravitational force between two objects of masses $$m_1$$ and $$m_2$$ separated by a distance $$r$$?

Accepted Answer

$$F = G \frac{m_1$ m_2$}{r^2$}$$

Question 3

A satellite in a stable circular orbit around Earth has constant:

Accepted Answer

Speed and kinetic energy

Question 4

Which of the following best explains why ocean tides occur?

Accepted Answer

The gravitational pull of the Moon and Sun on Earth's oceans

Question 5

Projectile motion is characterized by:

Accepted Answer

A constant horizontal velocity and a constant vertical acceleration

Question 6

The principle of continuity for fluid flow is mathematically expressed as:

Accepted Answer

$$A_1$$ $$v_1$$ = $$A_2$$ $$v_2$$

Question 7

According to Bernoulli's equation, what happens to the pressure in a fluid as its velocity increases?

Accepted Answer

Pressure decreases

Question 8

A barometer is used to measure atmospheric pressure. If the height of mercury in the barometer is 760 mm, what is the atmospheric pressure in Pascals? (Density of mercury $$ho = 13,600 \ 	ext{kg/m}^3$$, $$g = 9.8 \ 	ext{m/s}^2)$$

Accepted Answer

$$1.03 	imes 10^5$ \ 	ext{Pa}$$

Question 9

Which of the following statements about Pascal's Principle is correct?

Accepted Answer

Pressure applied to a confined fluid is transmitted equally in all directions.

Question 10

If a fluid flows through a pipe that narrows, what happens to its speed and pressure according to Bernoulli's principle?

Accepted Answer

Speed increases, pressure decreases

Question 11

A balloon rises in the atmosphere because:

Accepted Answer

The density of the balloon is less than the density of air

Question 12

Which of the following is NOT a state of matter discussed in the study materials?

Accepted Answer

Crystal

Question 13

The escape speed from Earth's surface is approximately:

Accepted Answer

$$11.2 \ 	ext{km/s}$$

Question 14

Which of the following best describes the relationship between atmospheric pressure and altitude?

Accepted Answer

Atmospheric pressure decreases as altitude increases

Question 15

In the Bernoulli equation $$P + \frac{1}{2} ho v^2$ + ho gh = 	ext{constant}$$, what does $$ho$$ represent?

Accepted Answer

Density of the fluid

Question 16

A gas in a container is heated. What happens to its pressure if the volume is kept constant?

Accepted Answer

Pressure increases

Question 17

Which of the following is a real-world application of Pascal's Principle?

Accepted Answer

Hydraulic lift

Question 18

If the atmospheric pressure is $$1.01 	imes 10^5$ \ 	ext{Pa}$$, what is the height of mercury in a barometer? (Density of mercury $$ho = 13,600 \ 	ext{kg/m}^3$$, $$g = 9.8 \ 	ext{m/s}^2)$$

Accepted Answer

$$0.76 \ 	ext{m}$$

Question 19

Which of the following best describes the effect of gravity on planetary orbits?

Accepted Answer

Gravity keeps planets in elliptical orbits around the Sun

Question 20

In the figure below (refer to Bernoulli's equation), which pressure is highest: $$P_1 or$$ $$P_2$$?

Accepted Answer

$$P_1 is $$higher

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