2. Physics - Q&A
134 questions found
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A drive shaft has a speed 150pi radians a second. What is the speed in RPM?
- 4500.
- 9000.
- 1500.
Kindly explain with formula
A temperature of 41 degrees Fahrenheit is, in Centigrade
- 7 degrees.
- 5 degrees.
- 9 degrees.
Kindly explain with formula
A lever of length 105 cm is used with a fulcrum placed 15 cm from the end bearing the load. Its mechanical advantage is
- 9.
- 7.
- 6.
Kindly explain with formula
A body starting from rest accelerates at the rate of 20 metres per second squared. What is the distance covered until the body reaches a velocity of 50 metres per second?
- 6.25 metres.
- 25.0 metres.
- 62.5 metres.
which equation for this?
A drive shaft has a speed 150pi radians a second. What is the speed in RPM?
- 4500.
- 9000.
- 1500.
Someone please explain?
A passive sensor
- does not require power.
- requires dc excitation.
- requires ac power input.
What is a Passive sensor?
A convex mirror forms a virtual image when
- rarely.
- seldom.
- always.
Concave form virtual always ..even convex image as well?
For a car weighing 1000 N, what force would be required to accelerate the car to 3 ms-2
- 150.2 N.
- 305.8 N.
- 610.5 N.
how?
A force 10 N is placed 2 Meters from a pivot point, what is the moment?
- 20Nm.
- 40Nm.
- 80Nm.
how?
Which of the following statements describes centrifugal force?
- Equal to centripetal force and acts in the opposite direction.
- Greater than centripetal force and acts in the same direction.
- Smaller than centripetal force and acts in the same direction.
Can anyone explain this? Thanks..
In a heat pump
- the evaporator loses heat.
- the condenser loses heat.
- the compressor loses heat.
Can anyone explain this? I always feel that heat pumps always gain heat during heating
What frequency is a tone which is 4 times the fundamental frequency?
- 2nd overtone.
- 3rd overtone.
- 3rd harmonic.
Explained please?
A process where temperature remains the same is known as
- isochoric.
- isobaric.
- isothermic.
I am a bit confused with meaning of isobaric, isochoric, isothermic
An aircraft of 2 metric tonnes uses 800 kilojoules kinetic energy to make an emergency stop. Its brakes apply a force of 10 kiloNewtons. What distance does it travel before it comes to a stop?
- 40m.
- 8 m.
- 80m.
I need some explanation for this..i got the answer 2metres
What is the thickness of a single mode fibre optic?
- 50 micrometres
- 5 micrometres.
- 15 micrometres
can any one explain why it is 50 micrometer and why not 5 micrometer
What is the angular velocity of a shaft rotating at 300rpm in radians/second?
- 10pi radians/second.
- 2pi radians/second.
- 5pi radians/second.
pls explain
A lifting machine moves with an effort, a distance of 200 cm, in order to raise it 0.5 m. The Velocity Ratio is
- 8.
- 4.
- 2.
pls explain
An aircraft of 2 metric tonnes lands with 400 kilojoules of energy, 10 kiloNewtons of force is applied at the brakes, how far does the aircraft take to stop?
- 40 M.
- 80 M.
- 20 M.
i think the answer is wrong...
cause i get the distance is 80m
Given that 1 cubic foot of water weighs 62.4 lbs and the specific gravity of fuel is 0.81, what is the weight of 10 cubic foot of fuel?
- 402.8 lbs.
- 505.4 lbs.
- 624.0 lbs.
how to solve its?
How long will it take a car moving at 60 km/hr to travel 90 km?
- 40 minutes.
- 75 minutes.
- 90 minutes.
How to solve its?
A spring extends 7 cm to the ground and back again 20 times a minute. What is the period?
- 0.3 hertz.
- 3 seconds.
- 1/3 cycle.
how it can be?
A radar rotates 1 revolution each 30 seconds and uses 10J of energy each revolution. How many joules does it use in a day?
- 28.8 kJ.
- 14.4 kJ.
- 57.6 kJ.
how to solve its??
Two sound waves of the same frequency and amplitude are moving half a wavelength out of phase with each other. What will be heard?
- Nothing.
- A chord.
- A pulse.
how
25 litres of fuel exerts a pressure of 10KPa. If a further 125 litres is added, the pressure will now be
- 50 kPa
- 60 kPa
- 40 kPa
how
The angular velocity of 500 RPM is, in rads/seconds is equal to
- 33.33pi rads/s.
- 52.36pi rads/s.
- 16.66pi rads/s.
please explain