Post Utme Physics Past Questions and Answers

Question 1251:

A mass of \(0.5 kg\) is attached to one end of a helical spring and produces an extension of \(2.5 cm\). The mass now set into vertical oscillation of amplitude \(10 mm\). The period of oscillation is ____________
\(\left(g=10 m / s ^{2}\right)\)

A. \(0.33\) s
B. \(100 s\)
C. \(200 s\)
D. \(280 s\)

Question 1252:

A boat is passing under a bridge. The deck of the boat is \(15 m\) below the bridge. A small package is to be dropped from the bridge onto the deck of the boat when the boat is \(25 m\) from just below the drop point. What (boat) speed is necessary to have the package land in the boat?
\(\left( g =9.8 m / s ^{2}\right)\)

A. \(17 m / s\)
B. \(14 m / s\)
C. \(1.7 m / s\)
D. \(4.9 m / s\)

Question 1253:

An \(0.60 kg\) rubber stopper is whirled in a horizontal circle of \(0.80 m\) radius at a rate of \(3.0\) revolutions per second. What is the tension in the string?

A. \(14 N\)
B. 80 N
C. 170N
D. 24 N

Question 1254:

An automobile is traveling at \(60 km / hr\). Calculate the angular velocity of the \(0.35 m\) radius wheels.

A. \(16.67 rad / s\)
B. \(47.6 rad / s\)
C. \(21 rad / s\)
D. \(171.4 rad / s\)

Question 1255:

An air bubble at the bottom of a lake has a volume of 20 \(cm ^{3}\), pressure of \(4.9 Pa\), and temperature \(4^{\circ} C\). The bubble rises to the surface where the temperature is \(20^{\circ} C\) and the pressure \(1.0 Pa\). Find the volume as the bubble reaclies the surface. (Take \(1 atm =1,0 \times 10^{5} N / m ^{2}\) ).

A. \(124 cm ^{3}\)
B. 319 \(cm ^{3}\)
C. \(60 cm ^{3}\)
D. \(104 cm ^{3}\)