Question 4851:

A weight of 1000 grams hangs from a lever \(20 cm\) to the right of the fulcrum. At the left is 500 gram weight \(20 cm\) from the fulcrum, and a 200 gram weight \(x\) cmaway from the fulcrum. What is the value of \(x\) that will make the lever balanced?

A. \(50 cm\)
B. \(20 cm\)
C. \(10 cm\)
D. \(30 cm\)
E. \(70 cm\)

Question 4852:

A magnetic needle is suspended firstat earth's north magnetic pole and at a point on the magnetic equator, the respective angles between the needle and the horizontal are ____________

A. \(0^{\circ}\) and \(0^{\circ}\)
B. \(60^{\circ}\) and \(60^{\circ}\)
C. \(90^{\circ}\) and \(90^{\circ}\)
D. \(90^{\circ}\) and \(0^{\circ}\)
E. \(0^{\circ}\) and \(90^{\circ}\)

Question 4853:

Which of the following is NOT a veater quality?

A. Force
B. Altitude
C. Weight
D. Displacement
E. Acceleration

Question 4854:

A man of mass \(50 kg\) ascender a flight of stairs \(5 m\) high in 5 seconds.
If acceleration due to gravity is \(10 m / s ^{2}\) :

A. \(100 w\)
B. 200w
C. \(250 w\)
D. \(400 w\)
E. \(500 w\)

Question 4855:

A body rolls down alstope from a height of \(100 m\). its velocity at the foot of the slope is \(20 m / s\).
what percentage o it essential potential energy is converted into kinetic energy ____________

A. \(40 \%\)
B. \(35 \%\)
C. \(20 \%\)
D. \(15 \%\)