Q: A satellite orbits the Earth at a height where the acceleration due to gravity is $$8.7\ \mathrm{m/s^2$}. If $$the radius of the Earth is $$6.4 \times 10^6$\ \mathrm{m}$$, what is the satellite's distance from the center of the Earth?

$$7.2 \times 10^6$\ \mathrm{m}$$

Question 1

A car accelerates uniformly from rest to a speed of $$20\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is the total distance traveled by the car during this time?

Accepted Answer

$$100\ \mathrm{m}$$

Question 2

Which of the following best describes Newton's Third Law of Motion?

Accepted Answer

For every action, there is an equal and opposite reaction.

Question 3

A $$2\ \mathrm{kg}$$ block slides down a frictionless incline of height $$5\ \mathrm{m}. $$What is its speed at the bottom of the incline? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$9.9\ \mathrm{m/s}$$

Question 4

A $$0.15\ \mathrm{kg}$$ baseball is pitched at $$40\ \mathrm{m/s}$$ and is hit back at $$60\ \mathrm{m/s} by a $$bat. What is the change in momentum of the baseball?

Accepted Answer

$$15\ \mathrm{kg\cdot m/s}$$

Question 5

A $$5\ \mathrm{kg}$$ object is moving in a circle of radius $$2\ \mathrm{m} at a $$constant speed of $$4\ \mathrm{m/s}. $$What is the magnitude of the centripetal force acting on the object?

Accepted Answer

$$10\ \mathrm{N}$$

Question 6

A $$10\ \mathrm{kg}$$ box is pulled across a horizontal surface with a force of $$50\ \mathrm{N} at an $$angle of $$30^\circ$$ above the horizontal. If the coefficient of kinetic friction is $$0.2$$, what is the acceleration of the box? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.1\ \mathrm{m/s^2$}$$

Question 7

A $$0.5\ \mathrm{kg}$$ ball is attached to a string and swung in a horizontal circle of radius $$1.5\ \mathrm{m} at a $$speed of $$3\ \mathrm{m/s}. $$What is the tension in the string?

Accepted Answer

$$3.0\ \mathrm{N}$$

Question 8

A $$2\ \mathrm{kg}$$ object is dropped from a height of $$10\ \mathrm{m}. $$Ignoring air resistance, what is the work done by gravity on the object as it falls?

Accepted Answer

$$200\ \mathrm{J}$$

Question 9

A $$0.2\ \mathrm{kg}$$ ball moving at $$5\ \mathrm{m/s}$$ collides elastically with a stationary $$0.2\ \mathrm{kg}$$ ball. What is the velocity of the first ball after the collision?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 10

A $$3\ \mathrm{kg}$$ object rotates about an axis at a distance of $$0.5\ \mathrm{m}$$ with an angular velocity of $$4\ \mathrm{rad/s}. $$What is its angular momentum?

Accepted Answer

$$12\ \mathrm{kg\cdot m^2$/s}$$

Question 11

A $$10\ \mathrm{kg}$$ beam is balanced horizontally on a fulcrum placed $$2\ \mathrm{m}$$ from one end. If a $$20\ \mathrm{kg}$$ mass is hung at the shorter end, how far from the fulcrum should a $$10\ \mathrm{kg}$$ mass be placed on the longer end to balance the beam?

Accepted Answer

$$1\ \mathrm{m}$$

Question 12

A hydraulic lift has a small piston of area $$0.01\ \mathrm{m^2$}$$ and a large piston of area $$1.0\ \mathrm{m^2$}. If a $$force of $$100\ \mathrm{N} is $$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 13

A satellite orbits the Earth at a height where the acceleration due to gravity is $$8.7\ \mathrm{m/s^2$}. If $$the radius of the Earth is $$6.4 	imes 10^6$\ \mathrm{m}$$, what is the satellite's distance from the center of the Earth?

Accepted Answer

$$7.2 	imes 10^6$\ \mathrm{m}$$

Question 14

A $$0.5\ \mathrm{kg}$$ block is attached to a spring with a force constant $$k = 200\ \mathrm{N/m}. If $$the block is pulled $$0.1\ \mathrm{m}$$ from equilibrium and released, what is its period of oscillation?

Accepted Answer

$$0.314\ \mathrm{s}$$

Question 15

A $$1.0\ \mathrm{kg}$$ sample of water at $$20^\circ\mathrm{C}$$ absorbs $$4200\ \mathrm{J} of $$heat. What is the final temperature of the water? (Specific heat of water $$= 4200\ \mathrm{J/(kg\cdot K)})$$

Accepted Answer

$$21^\circ\mathrm{C}$$

Question 16

A gas in a piston does $$500\ \mathrm{J} of $$work while absorbing $$300\ \mathrm{J} of $$heat from its surroundings. What is the change in internal energy of the gas?

Accepted Answer

$$-200\ \mathrm{J}$$

Question 17

Which of the following statements best describes the Second Law of Thermodynamics?

Accepted Answer

The entropy of an isolated system never decreases.

Question 18

A $$2\ \mathrm{kg}$$ object is moving at $$3\ \mathrm{m/s}$$ and collides inelastically with a $$1\ \mathrm{kg}$$ object at rest. What is the final velocity of the combined mass after the collision?

Accepted Answer

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

Question 19

A $$0.1\ \mathrm{kg}$$ metal cube at $$100^\circ\mathrm{C} is $$placed in $$0.5\ \mathrm{kg} of $$water at $$20^\circ\mathrm{C}. If $$the final equilibrium temperature is $$22^\circ\mathrm{C}$$, what is the specific heat capacity of the metal? (Specific heat of water $$= 4200\ \mathrm{J/(kg\cdot K)})$$

Accepted Answer

$$105\ \mathrm{J/(kg\cdot K)}$$

PHY 122: Engineering Physics I – Syllabus and Course Structure Study Guide

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