Other Physics Answers

1) A tuned circuit has a Q of 80 at its resonant frequency of 480 KHz. What is its bandwidth? (5 pts)

2) A parallel LC tuned circuit has a coil of 4 µH and a capacitance of 68 pF. The coil resistance is 9Ω. What is the circuit bandwidth?

3) A tuned circuit has a resonant frequency of 18 MHz and a bandwidth of 120 KHz. What are the upper and lower cutoff frequencies?

4) What value of Q is needed to achieve the bandwidth of 4 KHz at 3.6 MHz?

5) A filter has a 6-dB bandwidth of 3500 Hz and a 60-dB of 8400 Hz. What is the shape factor?

An aeroplane has a maximum acceleration of 6.0 m s–2. Calculate the minimum length for a straight runway so that the aeroplane, starting from rest, can safely take off at a velocity of 90 m s−1.

.

he diagram shows the initial velocity and the final velocity of a ball hit by

a racquet. The ball is in contact with the racquet for a time of 0.25 s.

Calculate: a the change in the velocity of the ball.b the average acceleration of the ball.

velocity against time graph is given for an object. Explain how you would use the graph to determine: a the acceleration of the object at any time. b the total displacement of the object.

a A student writes the following statement in his summary notes: Acceleration is the rate of change of speed. Explain why this statement is wrong.i Explain what is meant by deceleration. ii State the unit for deceleration.

A 4.58 kg pendulum hangs in an elevator. The tension in the string supporting the pendulum if the elevator moves downward with a constant velocity is ab.c N [up]. Input the values of a, b and c into the blank and use the guidelines below:

• Do not include a positive or negative sign.
• Include a decimal in your answer.
• Use a acceleration value of 9.81 m/s²
• Let up be positive

two blocks of masses m1=4.5 kg and m2=6.5 kg resting on a frictionless surface are connected by a light inextensible cord. A horizontal force F of 33N directed to the right is applied to the block with m1 and a horizontal force F of 11N directed to the left is applied to the block with m2. find the acceleration of the system and the tension in the rope.

Illustrate the stress and strain of solids.

2. What do you mean by the Young’s modulus for steel is 𝒀 = 𝟐. 𝟎 × 𝟏𝟎𝟏𝟏 𝑵𝒎−𝟐

? Explain

briefly.

3. Gold has a face centered cubic unit cell and has the density 𝟏𝟗. 𝟑 𝒈 𝒄𝒎−𝟑

. Calculate the

length along an edge. (𝐴𝑢 = 197 𝑔 𝑚𝑜𝑙

−1

)

4. Write down five real life applications of surface tension.

5. A capillary tube with an inside diameter of 𝟓𝟒𝟎 𝝁𝒎 can support a 𝟏𝟎𝟎 𝒎𝒎 column of liquid

that has a density of 𝟏𝟑𝟓𝟎𝟎 𝒌𝒈𝒎−𝟑

. If 𝒉 = 𝟎. 𝟏 then is it possible to find the surface tension

of the liquid? If not, then write down the reason.

6. Write a short note on polymer materials and amorphous solid.

1. Draw the velocity-time graph of a car that starts with an initial velocity of 15km/hr and accelerates uniformly at 5ms-2 until it attains a maximum velocity of 50km/hr, it them maintains this speed for the next 2min. Use the graph to determine:

a. The total distance covered before it maintains the maximum velocity reached

b. The total distance covered in the entire journey

c. Average velocity

a body of mass 0.1 kg drops from a height of 8m onto a hard floor bounces to a height of 2m. Calculate the momentum if the body is in contact with the floor for 0.1 seconds. What is the force exerted on the body (g=ms-²)