Physics Answers

A heating rated 100W is used to boil off 0.5kg of boiling water. the time to boil the water is ? (specific latent heat of vaporization= 2.30 × 10^6J/kg

A lifting machine has velocity ratio of 4 and can lift a load of 100kg when an effort of 327N is applied . If the acceleration due to gravity is 10m/s square Find:

a.)The efficiency of the machine.

b.)The effort required to overcome friction.

c.)Work done against friction when the load is lifted through a distance of 2m.

Assume that a car decelerates at 2.0m/s2 and comes to a stop after traveling 25m.

a) Find the speed of the car at the start of the deceleration and

b) Find the time required to come to a stop.

Assume that a car decelerates at 2.0m/s2 and comes to a stop after traveling 25m.

a) Find the speed of the car at the start of the deceleration

If a train going 60 m/s hits the brakes, and it takes the train 85 seconds to stop, what is the train’s acceleration? 

A sinusoidal travelling wave in x-direction has amplitude of 15 𝑐𝑚, wavelength of 40 𝑐𝑚 and the

frequency of 8 𝐻𝑧. The vertical displacement at 𝑥 = 0 and 𝑡 = 0 is 15 𝑐𝑚. Find (i) Wave number (ii)

Time period (iii) Wave speed, and (iv) Angular frequency of wave.

With the help of the diagram explain how you would determine the weight of the metre rule when you have been provided with a 50g mass metre rule, string and a pivot

From ear level down the wishing well, a coin is dropped by Liza. The coin falls a distance of 7.00 m before it strikes the water. If the speed of sound is 343 m/s, how long after Liza releases the coin will she hear a splash?

What are the details of briefly explain the scope of digital system design?

A car is speeding up and has an instantaneous velocity of 1.0 m/s in the +x-direction when a stopwatch reads 10.0 s. It has a constant acceleration of 2.0 m/s² in the x-direction.

(a) What change in speed occurs between t = 10.0 s and t = 12.0 s?

(b) What is the speed when the stopwatch reads 12.0 s?