Other Physics Answers

If the frequency of the vibrator is halved while everything else stays the same, a different standing wave is created. Which of the following statements about the pitch of the sound produced is true? a. The pitch increases, because it is directly proportional to frequency since the velocity doesn’t change. b. The pitch decreases, because it depends on the amount of energy flowing in the waves. c. The pitch decreases, because it is directly proportional to frequency since the velocity doesn’t change. d. The pitch stays the same, because it depends on the amplitude of the wave, which does not change. e. The pitch stays the same, because it depends on the length of the rope and the frequency doesn’t affect the length.

Calculate the intensity produced by a single slit diffraction and hence obtain the expression for the minima

Give a comparison between a convex lens and a zone plate. The diameter of central zone of a positive zone plate 

is 0.02cm. The zone plate is illuminated by a monochromatic point source of light of wavelength 490nm. Find the 

position of the first three maxima.

An object moves to the right 10.0 m from the starting point in a time of 1.0 a, then to the left 20.0 m in a time of 3.0 a, and then to the right 5.0 m in a time of 1.0 a.

q1=+10 nC and q2=-5 nC are separated by 0.10 m distance. If a third charge q3=2 nC is placed along with the first two charges, where should it be so that the net electric force of q1 and q2 on q3 is zero (0)?

An object of mass 0.2 kg is hung from a spring whose spring constant is 80 N/m. The object is subject to a resistive force given by -bx, where x is its velocity in meters per second.

(a) Set up differential equation of motion for free oscillations of the system.

(b) If the damped frequency is √3/2 of the undamped frequency, what is the value of the constant b?

(c)What is the Q of the system?

(d) After 2 seconds, what does the average energy decay to? (in terms of the initial average energy).

Will average speed ever equal average velocity?

a hailstone of mass 4.67 x10^-3 kg falls vertically at constant speed under influence of gravity and air resistance. What is the work done on the raindrop by the gravitational force and air resistance in joules if it falls for about 1.00 km? (present your answer in this form; x.xxx, x.xxx)

Water flows over hulugan falls, which is 70m high, at an average rate of 2.3 x 10^5 kg/s. If half the po­tential energy of this water were converted into electric en­ergy, how much power would be produced by these falls

1. A particle with a charge of –1.24 x 10-8 C is moving with instantaneous velocity 𝑣 =

(1.49 × 104 𝑚

𝑠

) 𝑖̂+ (−3.85 × 104 𝑚

𝑠

)𝑗. What is the force exert ̂ ed on this particle by a magnetic 

field (a) 𝐵⃑ = (1.40 𝑇)𝑖̂+ (−2.30 𝑇)𝑘̂ and (b) 𝐵⃑ = (−1.25 𝑇)𝑖̂+ (2.00 𝑇)𝑗̂+ (−3.50 𝑇)�