Question 1

A car accelerates uniformly from rest to a speed of $$20\ \mathrm{m/s} in$$ $$8\ \mathrm{s}. $$What is the car's acceleration?

Accepted Answer

$$2.0\ \mathrm{m/s^2$}$$

Question 2

A projectile is launched horizontally from a $$45\ \mathrm{m}$$ high cliff with an initial speed of $$10\ \mathrm{m/s}. $$Neglecting air resistance, how far from the base of the cliff does it land? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$30.4\ \mathrm{m}$$

Question 3

Which of the following best describes the relationship between velocity and acceleration when an object is slowing down?

Accepted Answer

Velocity and acceleration are in opposite directions.

Question 4

A $$5\ \mathrm{kg}$$ box is pulled across a horizontal surface with a force of $$30\ \mathrm{N} at an $$angle of $$37^\circ$$ above the horizontal. If the coefficient of kinetic friction is $$0.2$$, what is the normal force on the box? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$34.3\ \mathrm{N}$$

Question 5

A $$2\ \mathrm{kg}$$ object moves in a circle of radius $$0.5\ \mathrm{m} at a $$constant speed of $$4\ \mathrm{m/s}. $$What is the net force acting on the object?

Accepted Answer

$$32\ \mathrm{N}$$

Question 6

A $$0.5\ \mathrm{kg}$$ ball is dropped from rest from a height of $$20\ \mathrm{m}. $$What is its speed just before hitting the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

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

Question 7

A force of $$10\ \mathrm{N} is $$applied to a spring, stretching it from $$0.10\ \mathrm{m} to$$ $$0.15\ \mathrm{m}$$ over $$0.5\ \mathrm{s}. $$What is the impulse delivered to the spring?

Accepted Answer

$$2.5\ \mathrm{N \cdot s}$$

Question 8

A $$3\ \mathrm{kg}$$ object moving at $$4\ \mathrm{m/s}$$ collides elastically with a stationary $$2\ \mathrm{kg}$$ object. What is the velocity of the $$3\ \mathrm{kg}$$ object after the collision?

Accepted Answer

$$1.6\ \mathrm{m/s}$$

Question 9

A solid disk of mass $$2\ \mathrm{kg}$$ and radius $$0.5\ \mathrm{m}$$ rotates at $$120\ \mathrm{rpm}. $$What is its angular speed in radians per second?

Accepted Answer

$$8\ \mathrm{rad/s}$$

Question 10

A uniform beam $$4\ \mathrm{m}$$ long and mass $$20\ \mathrm{kg} is $$supported at one end. A $$40\ \mathrm{kg}$$ mass hangs $$3\ \mathrm{m}$$ from the support. What is the force required at the support to keep the beam in equilibrium? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$490\ \mathrm{N}$$

Question 11

A $$1.5\ \mathrm{kg}$$ block slides down a $$30^\circ$$ incline that is $$2\ \mathrm{m}$$ long. If the coefficient of kinetic friction is $$0.1$$, what is the block's acceleration?

Accepted Answer

$$3.4\ \mathrm{m/s^2$}$$

Question 12

A $$0.2\ \mathrm{kg}$$ ball is attached to a string and swung in a horizontal circle of radius $$0.5\ \mathrm{m} at$$ $$2\ \mathrm{m/s}. $$What is the tension in the string?

Accepted Answer

$$1.6\ \mathrm{N}$$

Question 13

A $$60\ \mathrm{kg}$$ diver jumps from a $$10\ \mathrm{m}$$ platform. What is the diver's kinetic energy just before hitting the water? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$5880\ \mathrm{J}$$

Question 14

A $$1000\ \mathrm{kg}$$ car engine delivers $$50\ \mathrm{kW} of $$power. How much time does it take to accelerate the car from rest to $$20\ \mathrm{m/s}$$? (Assume all energy goes into kinetic energy.)

Accepted Answer

$$4\ \mathrm{s}$$

Question 15

A hydraulic lift has a small piston of area $$0.01\ \mathrm{m^2$}$$ and a large piston of area $$0.5\ \mathrm{m^2$}. If a $$force of $$200\ \mathrm{N} is $$applied to the small piston, what is the maximum weight that can be lifted by the large piston (neglecting friction)?

Accepted Answer

$$10,000\ \mathrm{N}$$

Question 16

A $$2\ \mathrm{kg}$$ block is submerged in water and experiences a buoyant force of $$15\ \mathrm{N}. $$What is the density of the block? (Take $$g = 9.8\ \mathrm{m/s^2$}$$, density of water $$= 1000\ \mathrm{kg/m^3$})$$

Accepted Answer

$$1300\ \mathrm{kg/m^3$}$$

Question 17

Which of the following is NOT a method of heat transfer?

Accepted Answer

Compression

Question 18

A $$10\ \mathrm{kg}$$ box is at rest on a horizontal surface. The coefficient of static friction is $$0.4. $$What is the minimum horizontal force required to start moving the box? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$39.2\ \mathrm{N}$$

Question 19

A $$5\ \mathrm{kg}$$ object is moving at $$10\ \mathrm{m/s}$$ and collides inelastically with a $$3\ \mathrm{kg}$$ object at rest. What is the final velocity of the combined mass?

Accepted Answer

$$6.25\ \mathrm{m/s}$$

Physics Final Review: Key Concepts from Chapters 1–13

Guida di studio - Domande di pratica

Study guide - Flashcard