Physics Answers

A particle of mass 10-²kg is fixed to the top of a fan blade which rotates with angular velocity of 100rads-¹.if the radius of the blade is 0.2m. the centripetal force is what

If the back EMF induced in a coil when current changes from 1 ampere to 0 in 1 millisecond, is 5 volts, the self inductance of the coil is:-

(A) 5H

(B) 1H

(C) 5×10^-3 H

(D) 5×10^3 H

A nozzle is a device for increasing the velocity of a steadily flowing stream. At the inlet to

a certain nozzle, the enthalpy of the fluid passing is 3000 kJ/kg and the velocity is 60 m/s.

At the discharge end, the enthalpy is 2762 kJ/kg. The nozzle is horizontal and there is

negligible heat loss from it. (a) Find the velocity at exists from the nozzle. (b) If the inlet

area is 0.1 m2 and the specific volume at inlet is 0.187 m3

/kg, find the mass flow rate.

(c) If the specific volume at the nozzle exit is 0.498 m3

/kg, find the exit area of the nozzle.

Calculate the speed and velocity for a car that went a distance of 12.5 km west in 2 hours. (Please show the solution)

Rasta jump from a building 34 m above the ground. What is the velocity of Rasta at the end of 2.5 seconds? What time ut takes to hit the ground? (Please show the solution)

Train starts at 37 m/s to 12 m/s after 5 seconds. What is the acceleration of the train at this time? How far from starting point to the point after 5 seconds does the train travel? (Please show the solution)

Miriam was so happy that she is the first honor and she cannot wait to tell her parents about it. So, she ran from SCNHS Campus to her house which is 4.6 km north away. Upon reaching her house, her mother was in their hacienda which is 150 meters north away from their house, so she ran again until she reached her mother. What is the total distance and displacement of Miriam in meters? (Please show the solution for convention)

After shopping, Leni decided to go home and she travelled 3 km east to fetch her sister. Then, she proceeded to another 900 meters to reach their house. What is the total distance and displacement of Leni in km? What is the total distance and displacement of her sister in km? (Please show the solution)

Bong-bong swam 3 laps in a 50-m pool. What is his total distance and total displacement? (Please show the solution)

Find the sum of the vector using the component method. Please show the solution.

(vec) A = 5m, 25°

(vec) B = 11m, 125°

(vec) C = 25m, 35°

Note:

(vec) R = (vec) A + (vec) B + (vec) C