Q: Superman attempts to drink water through a straw of length $$l = 8.0\ \mathrm{m}. $$The density of water is $$1000\ \mathrm{kg/m^3$}$$ and atmospheric pressure is $$1.01 \times 10^5$\ \mathrm{Pa}. $$What is the water pressure at the top of the straw (assuming fluid is at rest)?

$$2.26 \times 10^4$\ \mathrm{Pa}$$

Question 1

Which of the following best describes the difference between distance and displacement in 1D kinematics?

Accepted Answer

Distance is the total length traveled regardless of direction, while displacement is the straight-line change in position with direction.

Question 2

A car accelerates uniformly from rest to a velocity of $$20\ \mathrm{m/s} in$$ $$5\ \mathrm{s}. $$What is the acceleration of the car?

Accepted Answer

$$2\ \mathrm{m/s^2$}$$

Question 3

A projectile is launched at an angle $$	heta$$ above the horizontal with initial speed $$v_0. $$Neglecting air resistance, which of the following statements is correct about its horizontal velocity?

Accepted Answer

It remains constant throughout the flight.

Question 4

A $$50.0\ \mathrm{N}$$ brick with dimensions $$30.0\ \mathrm{cm} 	imes 10.0\ \mathrm{cm} 	imes 4.00\ \mathrm{cm} is $$placed on a horizontal surface. What is the maximum pressure it can exert on the surface?

Accepted Answer

$$12.5\ \mathrm{kPa}$$

Question 5

Which of the following is NOT a vector quantity?

Accepted Answer

Distance

Question 6

A solid cylinder (moment of inertia $$I = \frac{1}{2}mR^2$) rolls without slipping up a hill. At the bottom, its speed is 5$$\ \mathrm{m/s}$$ and the hill is 2.3$$\ \mathrm{m}$$ high. Can the cylinder reach the top of the hill?

Accepted Answer

No, because the total mechanical energy is not sufficient.

Question 7

Two uniform discs are mounted on a common frictionless axle. Disc A (mass $$2\ \mathrm{kg}$$, radius $$0.3\ \mathrm{m}) $$spins at $$1\ \mathrm{rad/s}$$ clockwise, while Disc B (mass $$1\ \mathrm{kg}$$, radius $$0.3\ \mathrm{m}) $$spins at $$1\ \mathrm{rad/s}$$ counter-clockwise. The discs are then pressed together and stick. What is the final angular velocity (CCW is positive)?

Accepted Answer

$$-1/3\ \mathrm{rad/s}$$

Question 8

A $$10\ \mathrm{kg}$$ piece of aluminum sits at the bottom of a lake, right next to a $$10\ \mathrm{kg}$$ piece of lead. Which one has the greater buoyant force acting on it?

Accepted Answer

The aluminum

Question 9

Superman attempts to drink water through a straw of length $$l = 8.0\ \mathrm{m}. $$The density of water is $$1000\ \mathrm{kg/m^3$}$$ and atmospheric pressure is $$1.01 	imes 10^5$\ \mathrm{Pa}. $$What is the water pressure at the top of the straw (assuming fluid is at rest)?

Accepted Answer

$$2.26 	imes 10^4$\ \mathrm{Pa}$$

Question 10

A U-tube contains two different liquids in equilibrium. At which level must the pressure be the same on both sides of the tube?

Accepted Answer

At the lowest level

Question 11

Which of the following best describes the work-energy theorem?

Accepted Answer

The net work done on an object is equal to its change in kinetic energy.

Question 12

A $$2\ \mathrm{kg}$$ object moving at $$3\ \mathrm{m/s}$$ collides elastically with a stationary $$1\ \mathrm{kg}$$ object. What is the total momentum of the system before the collision?

Accepted Answer

$$6\ \mathrm{kg\cdot m/s}$$

Question 13

Which of the following is a correct application of Newton's Third Law?

Accepted Answer

When you push on a wall, the wall pushes back on you with an equal and opposite force.

Question 14

A block slides across a rough horizontal surface and comes to rest. Which force is responsible for the loss of mechanical energy?

Accepted Answer

Kinetic friction

Question 15

A $$0.5\ \mathrm{kg}$$ ball is attached to a string and swung in a horizontal circle of radius $$2.0\ \mathrm{m} at a $$constant speed of $$4.0\ \mathrm{m/s}. $$What is the magnitude of the centripetal force acting on the ball?

Accepted Answer

$$8.0\ \mathrm{N}$$

Question 16

A spring with spring constant $$k = 200\ \mathrm{N/m} is $$compressed by $$0.1\ \mathrm{m}. $$What is the potential energy stored in the spring?

Accepted Answer

$$2.0\ \mathrm{J}$$

Question 17

Which of the following statements about static and kinetic friction is correct?

Accepted Answer

Static friction can vary up to a maximum value, while kinetic friction is constant for a given pair of surfaces.

Question 18

A $$5\ \mathrm{kg}$$ object is acted on by a net force of $$15\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$3\ \mathrm{m/s^2$}$$

Question 19

A diver of mass $$60\ \mathrm{kg}$$ jumps off a platform $$10\ \mathrm{m}$$ above the water. What is her speed just before hitting the water? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$14.0\ \mathrm{m/s}$$

PHYS 1403: Final Exam Practice Problems and Key Concepts

Study Guide - Practice Questions

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