# CIE AS & A Level Physics : 1.1 Physical quantities – Exam style question – Paper 2

### Question

(a)Mass, length and time are SІ base quantities.
State two other base quantities.
1. …………………………………………………………………………………………………………………………….
2. …………………………………………………………………………………………………………………………….

(b) A mass m is placed on the end of a spring that is hanging vertically, as shown in Fig. 1.1. The mass is made to oscillate vertically. The time period of the oscillations of the mass is T.
The period T is given by

$$T = C\sqrt{\frac{m}{k}}$$

where C is a constant and k is the spring constant.
Show that C has no units.

(a)

temperature
current
(allow amount of substance and luminous intensity)

(b)

base units of force constant: kgms–2 m–1 or kg s–2
base units of time and mass: s and kg
base units of C: s (kgs–2 / kg)1/2 cancelling to show no units

### Question

(a) Distinguish between mass and weight.
mass: ……………………………………………………………………………………………………………….
…………………………………………………………………………………………………………………………
weight: ………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………
(b) An object O of mass 4.9 kg is suspended by a rope A that is fixed at point P. The object is pulled to one side and held in equilibrium by a second rope B, as shown in Fig. 2.1. Rope A is at an angle θ to the horizontal and rope B is horizontal. The tension in rope A is 69 N and the tension in rope B is T.
(i) On Fig. 2.1, draw arrows to represent the directions of all the forces acting on object O. 

(ii) Calculate
1. the angle θ,

θ = …………………………………………° 

2. the tension T.

T = ………………………………………. N 