2. Some equations for power that occur frequently in mechanical engineering are Pow = Fv and Pow = Tw Also, recall that 1 Hp = 550ff. Here are some elementary problems to help you improve your facility with units. (a) A model airplane flies at 45 mi/hr in level flight against a drag force of 2.5 lbf. How much power is required to maintain the plane in flight? Express your answer in Hp. (b) A power screw requires a torque of 5 N m to turn at 300 rpm. How much power is required? Express your answer in the appropriate SI derived unit. (c) A generator spins at 3600 rpm. Convert that rotational speed to units of rad/s.

2. Some equations for power that occur frequently in mechanical engineering are Pow = Fv and Pow = Tw Also, recall that 1 Hp = 550ff. Here are some elementary problems to help you improve your facility with units. (a) A model airplane flies at 45 mi/hr in level flight against a drag force of 2.5 lbf. How much power is required to maintain the plane in flight? Express your answer in Hp. (b) A power screw requires a torque of 5 N m to turn at 300 rpm. How much power is required? Express your answer in the appropriate SI derived unit. (c) A generator spins at 3600 rpm. Convert that rotational speed to units of rad/s.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Basic Terminology in Mechanics

The area of science and mathematics concerned the motion of the objects, the relation between the force matter, and motion if specified. Forces exerted over the objects result in displacements or changes in the position of an object concerning its environment. This branch of physics keeps its roots in Ancient Greece in the form of the scripts of Aristotle and Archimedes.

Question

2. Some equations for power that occur frequently in mechanical engineering are
Pow = Fv
and
Pow = Tw
Also, recall that 1 Hp = 550ft. Here are some elementary problems to help
you improve your facility with units.
(a) A model airplane flies at 45 mi/hr in level flight against a drag force of
2.5 lbf. How much power is required to maintain the plane in flight? Express
your answer in Hp.
(b) A power screw requires a torque of 5 N m to turn at 300 rpm. How much
power is required? Express your answer in the appropriate SI derived unit.
(c) A generator spins at 3600 rpm. Convert that rotational speed to units of
rad/s.
(d) A generator spins at 3600 rpm. Convert that rotational speed to units of
rev/s.
(e) A generator spins at 3600 rpm with a torque of 200 N m. In SI units what
is the power?
(f) An automobile engine produces 94 kW at 6300 rpm. In SI units, what is
the torque?
(g) An automobile engine produces 221 lb ft of torque at 1800 rpm. In Hp, how
much power does this engine produce?

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