Latest Question Answer for Singapore Primary and Secondary Level School Examinations

Asked by Jiminsshi in Physics

Q. A mixture of ethanol and water can be separated by fractional distillation. Ethanol and water boil at 78

°

C and 100

°

C respectively. Sketch and label on Fig. 6.2 below, the graph showing how temperature changes as a solution of ethanol and water is fractionally distilled.

Asked by Jiminsshi in Chemistry

Asked by Jiminsshi in Physics

Solve this:
Q.(b) An empty beaker has a mass of 88 g. When 20

c m^{3}

of mercury is poured into the beaker, the total mass of the beaker and mercury is 360 g. Calculate the density of mercury in

g c m^{- 3} a n d k g m^{- 3}

Asked by Jiminsshi in Physics

Solve this:
Q.5.(a) A copper ball has a mass of 1 kg. Calculate the radius of the ball, given that the density of copper is 8900 kg

m^{- 3}

.
(b) An empty beaker has a mass of 88 g. When 20

c m^{3}

of mercury is poured into the beaker, the total mass of the beaker and mercury is 360 g. Calculate the density of mercury in g

c m^{- 3}

and kg

m^{- 3}

.

Asked by Jiminsshi in Physics

Solve this:

Q. (c) Iron has a density of 7900 kg

m^{- 3}

. Calculate the volume of 2 kg of iron.

Asked by Jiminsshi in Maths

↵Hepp:

5. Find the set of values of the constant k for which the line y=k(x-1) intersects the curve y=x²+6x+k at two distinct points.

Asked by Jiminsshi in Physics

Figure 4.1 shows a truck transporting a passenger and logs of wood. Ropes are used to secure the logs to the truck. If the ropes come loose and the moving truck comes to a sudden stop, explain why the passenger in front of the logs is in danger of becoming seriously injured.

Asked by Jiminsshi in Physics

Explain
An astronaut is said to be "weightless" in outer space

Asked by Jiminsshi in Physics

Explain
(A) the mass of an astronaut is the same on earth and on the moon.

Asked by Jiminsshi in Chemistry

Explain the observation
(A) The mass of an astronaut is the same on earth and on the moon

Asked by Dawn in Maths

Need help for question 10 and 11 please! :)
Q.10. In

△

PQR,

∠ P R Q = 55 °

, 3 QR = 4 PR and the area of

△

PQR is 158

c m^{2}

.

Find the length of QR.
Q.11. Given that the area of a rhombus is 40

c m^{2}

and that each side has a length of 15 cm, find the angles of the rhombus.

Asked by Jiminsshi in Maths

Help

Q. The graph of the function y = kx³ passes through the point (–2, 16).

(a) Find the value of the constant k.

(b) Draw the graph of the function for – 2

\leq

x

\leq

2 using a scale of 2 cm to 1 unit on the x-axis and 1 cm to 5 units on the y-axis.

Asked by Jiminsshi in Maths

Help

Q. Sketch each of the following pairs of functions on the same diagram.

(a) y = x³ and y =

\frac{1}{3}

x³

(b) y = –x³ and y = –3x³

Asked by Jiminsshi in Physics

Helpp
Q.6. A wagon of mass 200 kg is tied to a horse by a rope. The horse pulls the wagon at a constant speed of 3 m

s^{- 1}

, with a force of 40 N in the horizontal rope.
(a) Explain why the horse needs to exert a force in order to pull the wagon at a constant speed.
(b) With the aid of calculations, explain how the force in the rope changes if the horse accelerates at 0.1 m

s^{- 2}

.

Asked by Jiminsshi in Physics

Help

Your Question

Select Subject & Chapter

Almost there! Please select the subject & chapter for this question

Selecting a correct chapter helps in getting the answer fast.