POE Midterm Exam

Required

2

A simple gear train is composed of three gears. Gear A is the driver and has 8 teeth, gear B has 24 teeth, and gear C has 16 teeth. If the output is C, what is the gear ratio?

Required

2

A first class lever in static equilibrium has a 500 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?

Required

2

Match definitions with the appropriate answers.

Draggable item		Corresponding Item
A rigid bar used to exert pressure or sustain weight at one point of its length by the application of a force at a second and turning at a third on a fulcrum		Lever
The ratio of the magnitude of the resistance and effort forces applied to a system.		Actual Mechanical Advantage
Ratio of distance traveled by the applied effort and resistance force within a system.		Ideal Mechanical Advantage
An external force applied to an object.		Effort Force

Required

2

What is a Moment?

Required

2

What is the Actual Mechanical Advantage (AMA) of the inclined plane?

Required

2

Calculate the current at R2.

Required

1

Identify a non-renewable energy source.

Required

2

If a student lifts a 225.4N ball 1.202 m in 20 sec, how many joules of work did the student complete?

Required

1

What is Biomass?

Required

1

What is Geothermal Energy?

Required

1

When components are wired in a parallel circuit, what happens to the total resistance?

Required

1

The U-value of a material measures the ability of the material to ___ heat. The the value the better the material will conduct heat.

1

Which of the following are digital input devices? Mark all that apply.

Required

1

What is the R-value of a material?

Required

1

What is Convection?

Required

1

What is Energy?

Required

2

Calculate the total resistance of the circuit.

Required

2

If the radius of the circle is 2 inches, what is the y-coordinate of the centroid of this half circle?

Required

3

Match definitions with the appropriate answers.

Draggable item		Corresponding Item
A diagram that shows all of the forces acting on an object.		Centroid
When an object is at rest or is moving at a constant velocity.		Free Body Diagram
The geometric center of an object.		Moment
An indicator of the stiffness of a material related to its material properties. The higher the value, the harder it is to make an object bend.		Static Equilibrium
A measure of the tendency of a force to rotate around a point.		Modulus of Elasticity
An indicator of the stiffness of a material related to its size and orientation. The higher the value, the harder it is to make an object bend.		Moment of Inertia

Required

2

A machinist is using a 6 inch long wrench to tighten a 1/4 inch bolt. What is the moment (in foot-pounds) if he applies 175 pounds of force to the wrench?

Required

2

If a 250 pound man walks on a 3" x 6" board (3" is the height) that is 5 feet long and deflects the board 0.25 inches, what is the modulus of elasticity?

Required

2

If a vector is 30 degrees from the horizon and the force of the vector is 150 pounds, what is the x-component of the vector?

Required

1

If you wanted to make the moment of inertia higher, the best way to do this would be to

Required

2

If you were standing in the middle of a 2" x 4" beam (the height is 4") across a 20 foot wide ditch, how much would the beam bend? Assume that you weigh 150 pounds and that the modulus of elasticity of the beam is 1.76 x 106 psi.

Required

2

In the free body diagram, what is missing?

Required

2

The moment of inertia for a 12 foot long by 3 inch wide and 4 inch high oak board would be

Required

2

Two people are pulling on a boat trying to pull it out of the water. Each person has a rope attached to the front end of the boat. One person is pulling with 150 pounds of force straight out of the water (following the x-axis). The other person is pulling the boat with 200 pounds of force at a 45 degree difference than that of the first person. What is the resultant force applied to the boat?

Required

1

To find the x-value and the y-value for the centroid of a right triangle, you do the following from the corner containing the right angle.

Required

1

In a free body diagram, how many reaction forces would replace the roller joint (C)?

Required

2

Calculate the total energy transfer in Joules for a wall section measuring 3 m x 5 m by 0.03 m thick with a thermal conductivity of 0.10 J/(smC). Opposing sides of the wall section have a temperature of 20 degrees Celsius and 15 degrees Celsius after one hour.

Required

2

A block of aluminum at 90 degrees Celsius is placed in 2.00 liter (2 kg) of water at 15 degrees Celsius. Calculate the energy transferred to the water if the final temperature becomes 37 degrees Celsius. The specific heat capacity of water is 4186 J/(kg*C).

Required

1

Given the information above, what is the R-value of the wall section at a point through the fiberglass batt?

Required

2

A cart is being pushed up an inclined plane. The vertical height of the inclined plane is 7 feet. The effort force required to push the cart up the inclined plane is 6.3 lb. The cart weighs a total of 15 1/3 lbs. What is the IMA? (Precision 0.00)

Required

1

What is the total current in the given in a simple circuit with 3 resistors (413 ohms, 1.3 kilo-ohms, and 0.513 kilo-ohms)?

Required

1

Which of the following properties is being measured by the multimeter?

Required

2

A student travels on a school bus in the middle of winter from home to school. The school bus temperature is 53 degrees Fahrenheit. The student's skin temperature is 92.4 degrees Fahrenheit. Determine the total energy transferred from the student's body during the 20 min ride to school due to electromagnetic radiation. Note: Skin emissivity is 0.90, and the surface area of the student is 1.60 m2. Don't forget to convert those temps to Kelvin!

Required

1

A wheel driven wheel and axle system will have a mechanical advantage...

Required

2

Calculate the ideal mechanical advantage of a given bolt with the thread notes of 5/16 24 NF. The distance from the center of the bolt to the end of the wrench being used to tighten the bolt is 1 foot and 1 inch.

Required

1

If mechanical advantage is greater than 1, proportionally _____ effort force is required to overcome the resistance force.

Required

1

If you are using a simple gear train to increase the speed of a vehicle, which gear should be attached to the wheel axle?

Required

2

What is the x-component of the force vector?

Required

1

What unit is constant in a series circuit?

Required

2

Find RAy and RBy if A is the pivot point.

Required

2

What is the reaction force at the end of the roller connection? The given force is in pounds and each grid line is equal to 1 foot.

Required

2

Calculate the magnitude and direction of the resultant force.

Required

2

Find the reaction force at B.

Required

2

What is d2 if the bears are in static equilibrium?

Required

1

What property is being measured by the multimeter?

Required

1

What property can be measured by a multimeter by positioning the leads as shown?

Required

2

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(smC). The opposing sides of the wall measure 25 deg C and 12 deg C.

Required

2

In the figure below, the Teenage Mutant Ninja Turtles are balancing on a beam waiting to destroy the Shredded. They are standing balanced in order from left to right: Leonardo (50N), Michelangelo (47 N), Donatello (29 N) and Raphael who didn't weigh in so we don't know his force. Determine Raphael's force in Newtons.

Required

2

A motor running a winch system can lift a 3N load 6 meters in 60 seconds while running at an average of 9 volts and drawing 500 mA. What is the efficiency of the system?

Required

2

Calculate the ideal mechanical advantage of the lever shown.

Required

2

If you lift a weight 10 inches using a pulley system with 8 supporting strands, what length of rope (in inches) would you have to pull?

Required

2

Find the reaction force in the y direction at A.

Required

2

A student weighs 150 lbs (F) and is standing on a beam which spans 96 inches (L). The Modulus of Elasticity (E) of the beam is 1,200,000 lb/in2 and the moment of inertia (I) is 12 in4. Calculate the beam deflection.

Required

2

Calculate the resistance force if the lever is in static equilibrium.

Required

2

Calculate the total gear ratio of the gear train if gear A is the driver.

Required

2

What is the IMA for the pulley shown?

Required

2

The electric winch is powered by an 18V battery. The winch lifts the weight shown a total of 13 meters and draws a total of 20 Amps. the weight is 210 Newtons. It takes a total of 17 seconds. What is the Power Out for the given scenario?

POE Midterm Exam

A simple gear train is composed of three gears. Gear A is the driver and has 8 teeth, gear B has 24 teeth, and gear C has 16 teeth. If the output is C, what is the gear ratio?

A first class lever in static equilibrium has a 500 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?

Match definitions with the appropriate answers.

What is a Moment?

What is the Actual Mechanical Advantage (AMA) of the inclined plane?

Calculate the current at R2.

Identify a non-renewable energy source.

If a student lifts a 225.4N ball 1.202 m in 20 sec, how many joules of work did the student complete?

What is Biomass?

What is Geothermal Energy?

When components are wired in a parallel circuit, what happens to the total resistance?

The U-value of a material measures the ability of the material to _________ heat. The ______ the value the better the material will conduct heat.

Which of the following are digital input devices? Mark all that apply.

What is the R-value of a material?

What is Convection?

What is Energy?

Calculate the total resistance of the circuit.

If the radius of the circle is 2 inches, what is the y-coordinate of the centroid of this half circle?

Match definitions with the appropriate answers.

A machinist is using a 6 inch long wrench to tighten a 1/4 inch bolt. What is the moment (in foot-pounds) if he applies 175 pounds of force to the wrench?

If a 250 pound man walks on a 3" x 6" board (3" is the height) that is 5 feet long and deflects the board 0.25 inches, what is the modulus of elasticity?

If a vector is 30 degrees from the horizon and the force of the vector is 150 pounds, what is the x-component of the vector?

If you wanted to make the moment of inertia higher, the best way to do this would be to

If you were standing in the middle of a 2" x 4" beam (the height is 4") across a 20 foot wide ditch, how much would the beam bend? Assume that you weigh 150 pounds and that the modulus of elasticity of the beam is 1.76 x 106 psi.

In the free body diagram, what is missing?

The moment of inertia for a 12 foot long by 3 inch wide and 4 inch high oak board would be

To find the x-value and the y-value for the centroid of a right triangle, you do the following from the corner containing the right angle.

In a free body diagram, how many reaction forces would replace the roller joint (C)?

Calculate the total energy transfer in Joules for a wall section measuring 3 m x 5 m by 0.03 m thick with a thermal conductivity of 0.10 J/(s*m*C). Opposing sides of the wall section have a temperature of 20 degrees Celsius and 15 degrees Celsius after one hour.

A block of aluminum at 90 degrees Celsius is placed in 2.00 liter (2 kg) of water at 15 degrees Celsius. Calculate the energy transferred to the water if the final temperature becomes 37 degrees Celsius. The specific heat capacity of water is 4186 J/(kg*C).

Given the information above, what is the R-value of the wall section at a point through the fiberglass batt?

A cart is being pushed up an inclined plane. The vertical height of the inclined plane is 7 feet. The effort force required to push the cart up the inclined plane is 6.3 lb. The cart weighs a total of 15 1/3 lbs. What is the IMA? (Precision 0.00)

What is the total current in the given in a simple circuit with 3 resistors (413 ohms, 1.3 kilo-ohms, and 0.513 kilo-ohms)?

Which of the following properties is being measured by the multimeter?

A wheel driven wheel and axle system will have a mechanical advantage...

Calculate the ideal mechanical advantage of a given bolt with the thread notes of 5/16 24 NF. The distance from the center of the bolt to the end of the wrench being used to tighten the bolt is 1 foot and 1 inch.

If mechanical advantage is greater than 1, proportionally _____ effort force is required to overcome the resistance force.

If you are using a simple gear train to increase the speed of a vehicle, which gear should be attached to the wheel axle?

What is the x-component of the force vector?

What unit is constant in a series circuit?

Find RAy and RBy if A is the pivot point.

What is the reaction force at the end of the roller connection? The given force is in pounds and each grid line is equal to 1 foot.

Calculate the magnitude and direction of the resultant force.

Find the reaction force at B.

What is d2 if the bears are in static equilibrium?

What property is being measured by the multimeter?

What property can be measured by a multimeter by positioning the leads as shown?

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(s*m*C). The opposing sides of the wall measure 25 deg C and 12 deg C.

A motor running a winch system can lift a 3N load 6 meters in 60 seconds while running at an average of 9 volts and drawing 500 mA. What is the efficiency of the system?

Calculate the ideal mechanical advantage of the lever shown.

If you lift a weight 10 inches using a pulley system with 8 supporting strands, what length of rope (in inches) would you have to pull?

Find the reaction force in the y direction at A.

A student weighs 150 lbs (F) and is standing on a beam which spans 96 inches (L). The Modulus of Elasticity (E) of the beam is 1,200,000 lb/in2 and the moment of inertia (I) is 12 in4. Calculate the beam deflection.

Calculate the resistance force if the lever is in static equilibrium.

Calculate the total gear ratio of the gear train if gear A is the driver.

What is the IMA for the pulley shown?

The electric winch is powered by an 18V battery. The winch lifts the weight shown a total of 13 meters and draws a total of 20 Amps. the weight is 210 Newtons. It takes a total of 17 seconds. What is the Power Out for the given scenario?

A simple gear train is composed of three gears. Gear A is the driver and has 8 teeth, gear B has 24 teeth, and gear C has 16 teeth. If the output is C, what is the gear ratio?

A first class lever in static equilibrium has a 500 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?

Match definitions with the appropriate answers.

What is a Moment?

What is the Actual Mechanical Advantage (AMA) of the inclined plane?

Calculate the current at R2.

Identify a non-renewable energy source.

If a student lifts a 225.4N ball 1.202 m in 20 sec, how many joules of work did the student complete?

What is Biomass?

What is Geothermal Energy?

When components are wired in a parallel circuit, what happens to the total resistance?

The U-value of a material measures the ability of the material to _________ heat. The ______ the value the better the material will conduct heat.

Which of the following are digital input devices? Mark all that apply.

What is the R-value of a material?

What is Convection?

What is Energy?

Calculate the total resistance of the circuit.

If the radius of the circle is 2 inches, what is the y-coordinate of the centroid of this half circle?

Match definitions with the appropriate answers.

A machinist is using a 6 inch long wrench to tighten a 1/4 inch bolt. What is the moment (in foot-pounds) if he applies 175 pounds of force to the wrench?

If a 250 pound man walks on a 3" x 6" board (3" is the height) that is 5 feet long and deflects the board 0.25 inches, what is the modulus of elasticity?

The U-value of a material measures the ability of the material to ___ heat. The the value the better the material will conduct heat.

Calculate the total energy transfer in Joules for a wall section measuring 3 m x 5 m by 0.03 m thick with a thermal conductivity of 0.10 J/(smC). Opposing sides of the wall section have a temperature of 20 degrees Celsius and 15 degrees Celsius after one hour.

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(smC). The opposing sides of the wall measure 25 deg C and 12 deg C.

The U-value of a material measures the ability of the material to ___ heat. The the value the better the material will conduct heat.

Calculate the total energy transfer in Joules for a wall section measuring 3 m x 5 m by 0.03 m thick with a thermal conductivity of 0.10 J/(smC). Opposing sides of the wall section have a temperature of 20 degrees Celsius and 15 degrees Celsius after one hour.

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(smC). The opposing sides of the wall measure 25 deg C and 12 deg C.