PART IV: Rewrite the following passive paragraph in active (10%) Rockets were invented by the Chinese about A. D. 1000. Gunpowder was packed into bamboo
tubes and ignited by means of a fuse. These rockets were fired by soldiers at enemy armies and
usually caused panic. In thirteenth-century England an improved form of gunpowder was
introduced by Roger Bacon. As a result, rockets were used in battles and were a common-
although unreliable-weapon. In the early eighteenth century a twenty-pound rocket that
traveled almost two miles was constructed by William Congreve, an English artillery expert, By
the late nineteenth century thought was given to supersonic speeds by the physicist Ernst Mach.
The sonic boom was predicted by him. The first liquid-fuel rocket was launched by the American
Robert Goddard in 1926. A pamphlet written by him anticipated almost all future rocket
developments. As a result of his pioneering work, he is called the father of modem rocketry.

The passive paragraph in the question can be rewritten in the active voice as follows:

- The Chinese invented the rocket about A.D. 1000. They packed gunpowder into bamboo tubes and ignited it by means of a fuse.

- Soldiers fired these rockets at enemy armies usually caused panic.

- In thirteenth-century England, Roger Bacon introduced an improved form of gunpowder. As a result, people used rockets in battles, and rockets were a common - although unreliable - weapon.

- In the early eighteenth century William Congreve, an English artillery expert, constructed a twenty-pound rocket that traveled almost two miles.

- By the late nineteenth century physicist Ernst Mach gave thought to supersonic speeds.

- American Robert Goddard launched the first liquid-fuel rocket in 1926. He wrote a pamphlet which anticipated almost all future rocket developments.

- As a result of his pioneering work, we call him the father of modern rocketry.

Subject + to be + main verb in the participle + by + agent

Subject + main verb + object

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The Chinese invented rockets about A.D. 1000. They packed gunpowder into bamboo tubes and ignited it by means of a fuse. Soldiers fired these rockets, which usually caused panic, at enemy armies. In thirteenth-century England, Roger Bacon introduced an improved form of gunpowder. As a result, soldiers used rockets, which were a common -  although unreliable - weapon, in battles. In the early eighteenth century, William Congreve, an English artillery expert, constructed a twenty-pound rocket that traveled almost two miles.  By the late nineteenth century, physicist Ernst Mach gave thought to supersonic speeds. He predicted the sonic boom. The American  Robert Goddard launched the first liquid-fuel rocket in 1926. A pamphlet he wrote anticipated almost all future rocket developments. As a result of his pioneering work, we call him the father of modem rocketry.

Explanation:

There are two grammatical voices in the English language:

The passive voice is usually recognized by the use of the construction by + the agent (the one who performs an action, e.g. by John). When we want to change a passive-voice sentence to active voice, we need to find the agent in the by + agent phrase or, if this phrase is omitted, consider carefully who or what is performing the action expressed in the verb. Then, we need to make that agent the subject of the sentence and change the verb accordingly.  

could you put the choices and excert up hun

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: