2. Physics - Q&A
134 questions found
Browse by module
In which medium does sound travel the fastest?
- Steel.
- Glass.
- Water.
is it steel?
The Mass of a Proton is approximately
- approximately 500 times the mass of an electron.
- equal to approximately half the mass of a neutron.
- 2000 times greater than the mass of an electron.
mass of proton is = mass of an electron thats the answer ?
In a jack with a ram only on one side and hydraulic fluid applied from both sides
- the ram will remain stationary, since equal hydraulic fluid pressures cancel on both sides of it.
- the ram will move away from the side where the ram is due to pressure on differential areas.
- the ram will move to the side where the ram is, due to pressure acting on differential areas.
surly if the ram takes up say 2 sq in and the jack piston has area of say 6 sq in, the piston minus ram area will be 4 sq in. Giving an overall advantage to the bare piston face equivelent to 2 sq in (the area of the ram) with equal pressure there is a net unbalanced force onthe bare piston face thus pushing it to the side were the ram is. Please explain how this is wrong?
An ice melted into a liquid will take up
- less space.
- same space.
- more space.
PL SOMEBODY HELP OUT
If heat is constant, and if pressure increases on a liquid what will the volume do?
- Slowly increases.
- Remains constant.
- Slowly decreases.
how?
A 4.5 kW electric motor is 90% efficient. How much energy does it use in 20 seconds?
- 4.5 kJ.
- 810 kJ.
- 100 kJ.
can somebody plz solve
A force of 15N is needed to move a body of mass 30kg along a footpath with uniform velocity. Find the coefficient of dynamic friction.(take g as 10m/s/s).
- 1/20.
- 1/10.
- 1/40.
please somebody explain
1000 lb/in2 is in an accumulator. If 3000 lb/in2 of hydraulic fluid is pumped in, what is the pressure on the air side?
- 3000 lb/in2.
- 4000 lb/in2.
- 1000 lb/in2.
1000 lb/in2 is in an accumulator. If 3000 lb/in2 of hydraulic fluid is pumped in, what is the pressure on the air side?
• 3000 lb/in2.....how
The point at which an applied force overcomes friction and an object begins to move is the co-efficient of
- limiting friction.
- starting friction.
- internal friction.
Lmiting fricion?