Physics

a turbine is to operate at 300 rpm under a net head of 400 m. if cv=0.98 what is the velocity?

a turbine is to operate at 300 rpm under a net head of 400 m. if cv=0.98 what is the velocity? EXPERT ANSWER Given, Net head, H net = 400m Co-efficient of velocity, Cv = 0.98 The turbine speed, N = 300rpm Therefore, the turbine is Francis turbine Now, Velocity, V = Cv × √(2gHnet) …

a turbine is to operate at 300 rpm under a net head of 400 m. if cv=0.98 what is the velocity? Read More »

B.4) A harmonic wave with a frequency of 80Hz and an amplitude of 0.025m travels along a string to the right with a speed of 12m/s. a) Write a suitable wave function for this wave. b) Find the maximum speed of a point on the string. c) Find the maximum acceleration of a point on the string.

EXPERT ANSWER Given f=80Hz Amplitude A= 0.025m Speed v=12m/s We know v^2= w^2(A^2-x^2) Where w=angular frequency=2πf=2(3.1415) (80) w= 502.6rad/s A^2-x^2=(v/w) ^2=(12/502.6) ^2 =0.00057 x^2=(0.025) ^2-0.00057 =5.49*10^-5 x=0.0074m wave function x = A cos wt=0.025 cos 502.6t Maximum speed vo=Aw vo=(0.025) (502.6) =12.56 m/s Maximum acceleration ao=Aw^2 ao=(0.025) (502.6^2) = 6315m/s^2

A. An engineer builds two simple pendula. Both are suspended from small wires secured to the ceiling of a room. Each pendulum hovers 2 cm above the floor. Pendulum 1has a bob with a mass of 10 kg. Pendulum 2 has a bob with a mass of 100 kg. Describe how the motion of the pendula will differ if the bobs are both displaced by 12o.

A. An engineer builds two simple pendula. Both are suspended from small wires secured to the ceiling of a room. Each pendulum hovers 2 cm above the floor. Pendulum 1has a bob with a mass of 10 kg. Pendulum 2 has a bob with a mass of 100 kg. Describe how the motion of the …

A. An engineer builds two simple pendula. Both are suspended from small wires secured to the ceiling of a room. Each pendulum hovers 2 cm above the floor. Pendulum 1has a bob with a mass of 10 kg. Pendulum 2 has a bob with a mass of 100 kg. Describe how the motion of the pendula will differ if the bobs are both displaced by 12o. Read More »

1. Does the period of a simple pendulum depend on the mass? 2. Is the period constant over small angles? Does it vary when one reaches larger angles? 3. Does the period depend on the length of the pendulum? 4. If a single period takes exactly 1.00 second, how long does a period take on the moon? If the gravitational acceleration of the moon is 1/6 of that on the earth

1. Does the period of a simple pendulum depend on the mass?2. Is the period constant over small angles? Does it vary when one reaches larger angles?3. Does the period depend on the length of the pendulum?4. If a single period takes exactly 1.00 second, how long does a period take on the moon? If …

1. Does the period of a simple pendulum depend on the mass? 2. Is the period constant over small angles? Does it vary when one reaches larger angles? 3. Does the period depend on the length of the pendulum? 4. If a single period takes exactly 1.00 second, how long does a period take on the moon? If the gravitational acceleration of the moon is 1/6 of that on the earth Read More »

Air is compressed polytropically along a path for which n= 1.3 in a closed system. The initial temperature and pressure are 17°C and 100kPa, respectively, and the final pressure is 500kPa. Assume R = 0.287 kJ/kg-K and average specific heats c, = 0.723 kJ/kg-K and cn = 1.01 kJ/kg.K. Find: a) the expansion ratio (v2/v1) b) the final temperature (T2) in K. e) the specific work done on the gas (-2)in k/kg d) the change of specific internal energy (uz – u), in kJ/kg. e) the specific heat transfer (91-2), in kJ/kg.

EXPERT ANSWER

or the parts the below question, fill in the empty boxes with your answer (YOUR ANSWER MUST BE ONLY A NUMBER; DO NOT WRITE UNITS; DO NOT WRITE LETTERS). Consider a glass tube with has a length of \( 1051 \mu \mathrm{m} \). The tube is filled with a gas \( (n=1.05) \) and positioned in front of one of the secondary sources in Young’s double slit experiment. The sources are illuminated by a laser beam of vacuum wavelength \( \lambda_{0}=710 \mathrm{~nm} \). a) [1 point] Which formula can be used to calculate the optical path length of a wave (refer to the formula sheet and select the number of the correct formula from the list)? b) [10 points] Calculate the optical path length of the wave passing through the tube, in SI units. \( O P L= \) c) [10 points] The gas is now removed from the tube and the tube is completely filled with a transparent material (of index \( n_{m} \) ). On comparing the fringe pattern corresponding to the gas with that of the material, it is found that the entire interference pattern on the viewing screen is displaced by 323 bright bands toward the side containing the tube. Determine the index of refraction of the material \( n_{m} \).

EXPERT ANSWER

Explain the least count and zero error. Why were these computed before any measurements were taken with the Vernier calipers?

Explain the least count and zero error. Why were these computed before any measurements were taken with the Vernier calipers? Why were multiple trials performed when measuring the marble and density cylinder? What are the material compositions of the marble and the density cylinder? What is the height of a solid cylinder with a mass …

Explain the least count and zero error. Why were these computed before any measurements were taken with the Vernier calipers? Read More »