# Science

## A single constant force F = (3 i + 5 j) N acts on a 3.97 kg particle. (a) Calculate the work done by this force if the particle moves from the origin to the point having the vector position r = ( i – 2 j) m.(b) What is the speed of the particle at r if its speed at the origin is 4 m/s?(c) What is the change in the potential energy of the system?

A single constant force F = (3 i + 5 j) N acts on a 3.97 kg particle.(a) Calculate the work done by this force if the particle moves from the origin to the point having the vector position r = ( i – 2 j) m. (b) What is the speed of the particle …

## Problem 1. A cable TV coaxial cable is designed with a characteristics impedance of 75Ω. The inner conductor is 0.5 mm thick and the internal diameter of the outer conductor is 8 mm. This cable is used to connect a cable TV distribution center to a TV 20 km away. Assume that the material between the conductors has an attenuation of 1 dB/km, which may be considered a low loss line. The permeability of the dielectric in the line is μ଴ and its permittivity is 4.9ε଴. The frequency is 80 MHz.(a) Calculate the propagation constant of the wave.(b) Write the voltage and current everywhere on the line. Assume the voltage at the generator is 1 V and the line is matched (no reflection of waves anywhere on the line).(c) If a TV requires a signal of at least 100 mV to receive properly, what must be the signal amplitude at the Generator?

EXPERT ANSWER (a) Velocity of the wave: Therefore,  Given  Rearranging, (b) Loss:  is the initial power Therefore, The loss is 1 dB/km So the loss after x km, is x dB Given  Therefore,  The impedence: where D is the external diameter and d is the internal diameter. Therefore, current: Therefore, where x is in km …

## What are the two famous ways of designing the RTD sensor? TT T Arial 3 (12pt) T.S

EXPERT ANSWER The two famous ways of designing RTD sensor are:- 1) Wire wound and 2.) Thin film. In wire wound RTD it uses platinum wire wound around a ceramic or glass bobbin in one of two configurations: birdcage and helix. While in the thin-film type, the sensing element is formed by depositing a thin …

## A 100m steel bridge sits on two concrete abutments and has a mass has a mass of about 1.00×105 kg. Its CG is in the middle of the bridge. A car of 1000 kg is located 40 m from the left end of the bridge and a truck with a mass of 5000 kg is located 60 meters from the same end.

A 100m Steel Bridge Sits On Two Concrete Abutments And Has A Mass Has A Mass Of About 1.00×105&Nbsp;Kg. Its CG Is In The Middle Of The Bridge. A Car Of 1000 Kg Is Located 40 M From The Left End Of The Bridge And A Truck With A Mass Of 5000 Kg Is Located …

## A strip of copper 120 µm wide is placed in a uniform magnetic field of magnitude 0.67 T, perpendicular to the strip. A current i = 23 A is then sent through the strip. Find the ratio of the Hall electric field E to the electric field EC responsible for moving charge (the current) along the length of the strip (E/EC). (The number of charge carriers per unit volume for copper is 8.47 × 1028 electrons/m3and its resistivity is 1.69 × 10-8 ohm-m.)

A strip of copper 120 µm wide is placed in a uniform magnetic field of magnitude 0.67 T, perpendicular to the strip. A current i = 23 A is then sent through the strip. Find the ratio of the Hall electric field E to the electric field EC responsible for moving charge (the current) along the length of the strip (E/EC). …