1. work done over time
   mechanical transfer of energy
2. nonmechanical transfer of energy

Horsepower is defined as work done over time. One horsepower is measured specifically as 33,000 foot-pounds of work per minute.

1. James Joule
   Isaac Newton
2. James Watt

Scottish engineer James Watt derived the measurement of horsepower in the late 1700s after experimenting with powerful draft horses.

1. true
2. false

The measurement of 1 horsepower is actually about 50 percent more than the rate of work an average horse can sustain during a working day.

1. a linear force
   a twisting force causing rotation
2. rotation over time

Torque is defined as a twisting force that causes or tends to cause rotation.

1. Archimedes
   Isaac Newton
2. Galileo

The concept of torque originated with Archimedes and his work with levers.

1. Newton meters
   meter-kilograms
2. Newton kilometers

While torque is measured in pound-feet in the U.S., Newton meters is the metric or SI unit of measurement for torque.

1. 0.5 horsepower (373 watts)
   0.75 horsepower
2. 1 horsepower

The one-cylinder engine of the first gasoline automobile, the Benz Patent Motorcar, generated 0.75 horsepower. The Benz automobile was patented by Carl Benz in 1886.

1. Patrick Dempsey
   Ralph Lauren
2. Jay Leno

Celebrity car collector Jay Leno once said this line.

1. 403 horsepower (300,517 watts)
   503 horsepower
2. 603 horsepower

The 2016 Mercedes-AMG GT S produces 503 horsepower.

1. torque
   horsepower
2. neither

Torque is the force that initiates the movement of a stationary vehicle.

1. 500-750 pound-feet (678-1,017 Newton meters)
   750-1,000 pound-feet
2. 1,200-2,050 pound-feet

Most turbocharged semitrailer engines produce 1,200-2,050 pound-feet of torque.

1. torque
   horsepower
2. neither

A vehicle at highway speed requires less torque and more horsepower to maintain the relatively high rate of speed.

1. 12.2 horsepower
   8.2 horsepower
2. 4.2 horsepower

The Peel P50, originally built in the 1960s, produces only 4.2 horsepower.

1. 15.9 pound-feet (22 Newton meters)
   9.9 pound-feet
2. 3.09 pound-feet

The new replica of the Peel P50 produces just 3.09 pound-feet of torque.

1. true
2. false

The horsepower of an engine is calculated by using torque. To find horsepower, torque (pound-feet) is multiplied by speed (revolutions per minute) and divided by the constant 5,252.

1. speedometer
   dynamometer
2. tachometer

A dynamometer is used to measure the horsepower of an automobile. The drive wheels of a vehicle are placed on spinning rollers that apply a load to the drivetrain while the torque is measured at various engine rpm speeds. The data is converted to horsepower.

1. 746 watts
   746 ohms
2. 746 amps

The electrical equivalent of 1 horsepower is 746 watts.

1. 706 pound-feet (957 Newton meters)
   906 pound-feet
2. 1,106 pound-feet

The Bugatti Veyron 16.4 Grand Sport Vitesse produces 1,106 pound-feet of torque. The Veyron has one of the highest torque ratings of all production cars.

1. horsepower output with the drivetrain
   horsepower output without the drivetrain
2. neither

Brake horsepower measures the engine output without the drivetrain. Brake refers to a horsepower measuring device called the Prony brake that was Gaspard de Prony invented in the early 1900s.

1. the axle
   the engine's flywheel
2. the rear wheels

The flywheel is a heavy disc attached to the engine's crankshaft. It is designed to smooth gaps in the engine's delivery of power by storing and periodically releasing excess energy.

1. 15 percent
   10 percent
2. 5 percent

Brake horsepower is about 15 percent higher than the standard horsepower measurement because of power loss from friction throughout the drivetrain.

1. Newton's third law
   Newton's second law
2. Newton's first law

Newton's first law of motion is also called the law of inertia.

1. 5,252 rpm
   2,525 rpm
2. They are never the same.

At a speed of 5,252 rpm, torque and horsepower are always the same.

1. 1,545 British thermal units
   2,545 British thermal units
2. 3,545 British thermal units

The heat equivalent of 1 horsepower is 2,545 British thermal units, or Btu per hour.

1. 30,683 pound-feet (41,601 Newton meters)
   15,683 pound-feet
2. 1,683 pound-feet

The Landini Rex 110 produces 30,683 pound-feet of torque, one of the highest torque ratings of any tractor.

1. 102 horsepower
   202 horsepower
2. 302 horsepower

The Landini Rex 110 utility tractor has a rating of 102 horsepower.

1. electrical input in amps
   electrical input in volts
2. electrical input in watts

Electrical motor horsepower can be derived from the electrical input to the motor in watts.

1. Mark Donohue
   Bobby Unser
2. Rick Mears

Donohue raced in the '60s and '70s.

1. true
2. false

In physics, torque is a vector quantity. Vectors are values that are described by both a magnitude and a direction.

1. 375
   3,737
2. 5,252

Three hundred seventy-five is equal to one horsepower measured in mile-pounds per hour.